| Participant | Pseudonymous participant identifier |
| ClipOrder | Presentation order of the clip for the participant, 1 = first to 28 = last |
| ClipID | Unique political clip identifier |
| ArousalResponse | Participant arousal rating after the clip (VAS - 1-100, with nine pictorial anchors from Bradley & Lang, 1994) |
| ArousalRT | Reaction time for the arousal rating, in seconds |
| ValenceResponse | Participant valence rating after the clip (VAS - 1-100, with nine pictorial anchors from Bradley & Lang, 1994) |
| ValenceRT | Reaction time for the valence rating, in seconds |
| AgreementResponse | Participant agreement rating after the clip (VAS - 1-100) |
| AgreementRT | Reaction time for the agreement rating, in seconds |
| SalienceResponse | Participant salience rating after the clip (VAS - 1-100) |
| SalienceRT | Reaction time for the salience rating, in seconds |
| PersuasivenessResponse | Participant persuasiveness rating after the clip (VAS - 1-100) |
| PersuasivenessRT | Reaction time for the persuasiveness rating, in seconds |
| AuthenticityResponse | Participant authenticity rating after the clip (VAS - 1-100) |
| AuthenticityRT | Reaction time for the authenticity rating, in seconds |
| FamiliarityResponse | Participant familiarity rating after the clip, 1 = not familiar to 5 = very familiar |
| FamiliarityRT | Reaction time for the familiarity rating, in seconds |
| PoliticalBeliefResponse | Participant political-belief rating after the clip (the clip-specific question) (VAS - 1-100) |
| PoliticalBeliefRT | Reaction time for the political-belief rating, in seconds |
| EmotionSelfReport | Participant's open-ended written emotion report |
| PhasicEDA | Phasic skin conductance over the clip, in µS. The 500 Hz skin-conductance recording of the trial (BIOPAC BioNomadix, wet electrodes on the palm of the non-dominant hand) was downsampled to 32 Hz in Ledalab and decomposed by continuous decomposition analysis (Benedek & Kaernbach, 2010) into a tonic component and a phasic driver, with the tau parameters of the impulse response optimised automatically by Ledalab and a minimum response amplitude of 0.1 µS. The value is the mean of the phasic driver over the clip (Ledalab's CDA.SCR); it indexes discrete sympathetic responses during the clip, disregards the slowly changing level of skin conductance, and, being an average, does not grow with clip length. |
| TonicEDA | Tonic skin conductance level over the clip, in µS. The 500 Hz skin-conductance recording of the trial (BIOPAC BioNomadix, wet electrodes on the palm of the non-dominant hand) was downsampled to 32 Hz in Ledalab and decomposed by continuous decomposition analysis (Benedek & Kaernbach, 2010) into a tonic component and a phasic driver, with the tau parameters of the impulse response optimised automatically by Ledalab and a minimum response amplitude of 0.1 µS. The value is the mean of the tonic component over the clip (Ledalab's CDA.Tonic); it indexes the participant's general level of sympathetic activity, which changes too slowly to differ between clips of one to two minutes. |
| AlphaAsymmetry | Frontal alpha asymmetry: log10 of Alpha_F4 minus log10 of Alpha_F3, the absolute alpha-band (8-12 Hz) powers at the right and left frontal sites computed for this trial (Reznik & Allen, 2018). Dimensionless, a difference of log10 µV² values. Positive values mean more alpha on the right than on the left, that is relatively greater left-hemispheric activation, read as a balance tilted towards approach rather than avoidance motivation. |
| Alpha_Cz | Absolute EEG power in the alpha band (8-12 Hz) at Cz (central midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 8-12 Hz. No trials were rejected. |
| Alpha_F3 | Absolute EEG power in the alpha band (8-12 Hz) at F3 (left frontal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 8-12 Hz. No trials were rejected. |
| Alpha_F4 | Absolute EEG power in the alpha band (8-12 Hz) at F4 (right frontal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 8-12 Hz. No trials were rejected. |
| Alpha_Fz | Absolute EEG power in the alpha band (8-12 Hz) at Fz (frontal midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 8-12 Hz. No trials were rejected. |
| Alpha_P3 | Absolute EEG power in the alpha band (8-12 Hz) at P3 (left parietal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 8-12 Hz. No trials were rejected. |
| Alpha_P4 | Absolute EEG power in the alpha band (8-12 Hz) at P4 (right parietal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 8-12 Hz. No trials were rejected. |
| Alpha_Pz | Absolute EEG power in the alpha band (8-12 Hz) at Pz (parietal midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 8-12 Hz. No trials were rejected. |
| Beta_Cz | Absolute EEG power in the beta band (13-30 Hz) at Cz (central midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 13-30 Hz. No trials were rejected. |
| Beta_F3 | Absolute EEG power in the beta band (13-30 Hz) at F3 (left frontal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 13-30 Hz. No trials were rejected. |
| Beta_F4 | Absolute EEG power in the beta band (13-30 Hz) at F4 (right frontal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 13-30 Hz. No trials were rejected. |
| Beta_Fz | Absolute EEG power in the beta band (13-30 Hz) at Fz (frontal midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 13-30 Hz. No trials were rejected. |
| Beta_P3 | Absolute EEG power in the beta band (13-30 Hz) at P3 (left parietal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 13-30 Hz. No trials were rejected. |
| Beta_P4 | Absolute EEG power in the beta band (13-30 Hz) at P4 (right parietal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 13-30 Hz. No trials were rejected. |
| Beta_Pz | Absolute EEG power in the beta band (13-30 Hz) at Pz (parietal midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 13-30 Hz. No trials were rejected. |
| Delta_Cz | Absolute EEG power in the delta band (1-3 Hz) at Cz (central midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 1-3 Hz. No trials were rejected. |
| Delta_F3 | Absolute EEG power in the delta band (1-3 Hz) at F3 (left frontal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 1-3 Hz. No trials were rejected. |
| Delta_F4 | Absolute EEG power in the delta band (1-3 Hz) at F4 (right frontal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 1-3 Hz. No trials were rejected. |
| Delta_Fz | Absolute EEG power in the delta band (1-3 Hz) at Fz (frontal midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 1-3 Hz. No trials were rejected. |
| Delta_P3 | Absolute EEG power in the delta band (1-3 Hz) at P3 (left parietal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 1-3 Hz. No trials were rejected. |
| Delta_P4 | Absolute EEG power in the delta band (1-3 Hz) at P4 (right parietal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 1-3 Hz. No trials were rejected. |
| Delta_Pz | Absolute EEG power in the delta band (1-3 Hz) at Pz (parietal midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 1-3 Hz. No trials were rejected. |
| LowGamma_Cz | Absolute EEG power in the low-gamma band (30-40 Hz) at Cz (central midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 30-40 Hz. No trials were rejected. |
| LowGamma_F3 | Absolute EEG power in the low-gamma band (30-40 Hz) at F3 (left frontal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 30-40 Hz. No trials were rejected. |
| LowGamma_F4 | Absolute EEG power in the low-gamma band (30-40 Hz) at F4 (right frontal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 30-40 Hz. No trials were rejected. |
| LowGamma_Fz | Absolute EEG power in the low-gamma band (30-40 Hz) at Fz (frontal midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 30-40 Hz. No trials were rejected. |
| LowGamma_P3 | Absolute EEG power in the low-gamma band (30-40 Hz) at P3 (left parietal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 30-40 Hz. No trials were rejected. |
| LowGamma_P4 | Absolute EEG power in the low-gamma band (30-40 Hz) at P4 (right parietal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 30-40 Hz. No trials were rejected. |
| LowGamma_Pz | Absolute EEG power in the low-gamma band (30-40 Hz) at Pz (parietal midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 30-40 Hz. No trials were rejected. |
| Theta_Cz | Absolute EEG power in the theta band (4-7 Hz) at Cz (central midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 4-7 Hz. No trials were rejected. |
| Theta_F3 | Absolute EEG power in the theta band (4-7 Hz) at F3 (left frontal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 4-7 Hz. No trials were rejected. |
| Theta_F4 | Absolute EEG power in the theta band (4-7 Hz) at F4 (right frontal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 4-7 Hz. No trials were rejected. |
| Theta_Fz | Absolute EEG power in the theta band (4-7 Hz) at Fz (frontal midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 4-7 Hz. No trials were rejected. |
| Theta_P3 | Absolute EEG power in the theta band (4-7 Hz) at P3 (left parietal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 4-7 Hz. No trials were rejected. |
| Theta_P4 | Absolute EEG power in the theta band (4-7 Hz) at P4 (right parietal, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 4-7 Hz. No trials were rejected. |
| Theta_Pz | Absolute EEG power in the theta band (4-7 Hz) at Pz (parietal midline, 10-20 system) over the clip, in µV². Computed from the raw EEG recording of the trial (Enobio 8, 500 Hz): a 50 Hz notch filter (Q = 30) and a fourth-order Butterworth band-pass filter of 0.5-40 Hz were applied, both zero-phase; ocular artefacts were removed by regressing the channel on the demeaned EOG channel and subtracting the fit; the power spectral density was estimated by Welch's method with 2-second Hann windows and 50% overlap; and the band power is the trapezoidal integral of the density over 4-7 Hz. No trials were rejected. |
| PoliticalbeliefPrior | Political belief rating given upon registration (the clip-specific question) (VAS - 0-100) |
| PoliticalbeliefChange | Difference in political belief rating between the experiment and the registration (the clip-specific question) (Prior value substracted from Experiment value), in VAS points, -100 to 100 |
| PoliticalbeliefStrength | Strength of the prior political belief regardless of direction: absolute distance of PoliticalbeliefPrior from the scale midpoint of 50 in VAS points (0 = neutral, 50 = extreme, on the VAS 0-100) |
| HR | Mean heart rate during the clip, in beats per minute. The 500 Hz PPG recording of the trial (BIOPAC BioNomadix clamp sensor on the index finger of the non-dominant hand) was analysed in Kubios HRV Scientific 4.2.0 with the clip as one analysis sample: pulse peaks were detected and converted to inter-beat intervals, artefactual beats were corrected with Kubios's automatic correction, and the mean rate was computed from the non-detrended intervals. |
| RMSSD | Heart rate variability during the clip: the root mean square of successive differences between adjacent inter-beat intervals, in seconds. The 500 Hz PPG recording of the trial (BIOPAC BioNomadix clamp sensor on the index finger of the non-dominant hand) was analysed in Kubios HRV Scientific 4.2.0 with the clip as one analysis sample: pulse peaks were detected and converted to inter-beat intervals, artefactual beats were corrected with Kubios's automatic correction, and the very-low-frequency trend was removed with the smoothness-priors method. Kubios reports the value in milliseconds; it is archived divided by 1000. Indexes parasympathetic activity, read in this context as the capacity for emotional self-regulation. |
| MeanPupilDiameter | Mean pupil diameter over the clip in millimetres, averaged across both eyes. The 60 Hz Tobii Pro Spark recording of the trial was processed per eye following Kret and Sjak-Shie (2019): samples outside 1.5-9 mm were removed; dilation-speed outliers (median + 16 median absolute deviations), which mark the edges of blinks, were removed; the two eyes were combined by averaging whichever samples remained valid; gaps up to 250 ms were linearly interpolated; and a trial with fewer than 50% valid samples after these steps was left empty. The value is the mean of the reconstructed trace. Not baseline-corrected: the recordings run from clip onset to clip offset and contain no pre-clip period. |
| ThetaBetaRatio_Cz | Theta/beta ratio at Cz (central midline, 10-20 system): Theta_Cz divided by Beta_Cz, the absolute theta-band (4-7 Hz) and beta-band (13-30 Hz) powers at Cz computed for this trial. Dimensionless. Higher values mean relatively more slow-wave than fast-wave activity, read as a balance tilted from effortful, deliberative processing towards affective engagement and emotional regulation (Putman et al., 2014; Angelidis et al., 2018). |
| ThetaBetaRatio_F3 | Theta/beta ratio at F3 (left frontal, 10-20 system): Theta_F3 divided by Beta_F3, the absolute theta-band (4-7 Hz) and beta-band (13-30 Hz) powers at F3 computed for this trial. Dimensionless. Higher values mean relatively more slow-wave than fast-wave activity, read as a balance tilted from effortful, deliberative processing towards affective engagement and emotional regulation (Putman et al., 2014; Angelidis et al., 2018). |
| ThetaBetaRatio_F4 | Theta/beta ratio at F4 (right frontal, 10-20 system): Theta_F4 divided by Beta_F4, the absolute theta-band (4-7 Hz) and beta-band (13-30 Hz) powers at F4 computed for this trial. Dimensionless. Higher values mean relatively more slow-wave than fast-wave activity, read as a balance tilted from effortful, deliberative processing towards affective engagement and emotional regulation (Putman et al., 2014; Angelidis et al., 2018). |
| ThetaBetaRatio_Fz | Theta/beta ratio at Fz (frontal midline, 10-20 system): Theta_Fz divided by Beta_Fz, the absolute theta-band (4-7 Hz) and beta-band (13-30 Hz) powers at Fz computed for this trial. Dimensionless. Higher values mean relatively more slow-wave than fast-wave activity, read as a balance tilted from effortful, deliberative processing towards affective engagement and emotional regulation (Putman et al., 2014; Angelidis et al., 2018). |
| ThetaBetaRatio_P3 | Theta/beta ratio at P3 (left parietal, 10-20 system): Theta_P3 divided by Beta_P3, the absolute theta-band (4-7 Hz) and beta-band (13-30 Hz) powers at P3 computed for this trial. Dimensionless. Higher values mean relatively more slow-wave than fast-wave activity, read as a balance tilted from effortful, deliberative processing towards affective engagement and emotional regulation (Putman et al., 2014; Angelidis et al., 2018). |
| ThetaBetaRatio_P4 | Theta/beta ratio at P4 (right parietal, 10-20 system): Theta_P4 divided by Beta_P4, the absolute theta-band (4-7 Hz) and beta-band (13-30 Hz) powers at P4 computed for this trial. Dimensionless. Higher values mean relatively more slow-wave than fast-wave activity, read as a balance tilted from effortful, deliberative processing towards affective engagement and emotional regulation (Putman et al., 2014; Angelidis et al., 2018). |
| ThetaBetaRatio_Pz | Theta/beta ratio at Pz (parietal midline, 10-20 system): Theta_Pz divided by Beta_Pz, the absolute theta-band (4-7 Hz) and beta-band (13-30 Hz) powers at Pz computed for this trial. Dimensionless. Higher values mean relatively more slow-wave than fast-wave activity, read as a balance tilted from effortful, deliberative processing towards affective engagement and emotional regulation (Putman et al., 2014; Angelidis et al., 2018). |
| NRC_Anger | Anger intensity of the participant's open-ended emotion report (EmotionSelfReport), scored with the Dutch term list of the NRC Emotion Intensity Lexicon (NRC-EIL; Mohammad, 2018). The response text and its lemmas, obtained with spaCy's nl_core_news_lg model, were matched against the lexicon's anger terms and the intensities of the matched terms (each 0-1) summed, so 0 means no anger term was found and values above 1 mean several were. Dimensionless. Empty where the participant wrote nothing. |
| NRC_Fear | Fear intensity of the participant's open-ended emotion report (EmotionSelfReport), scored with the Dutch term list of the NRC Emotion Intensity Lexicon (NRC-EIL; Mohammad, 2018). The response text and its lemmas, obtained with spaCy's nl_core_news_lg model, were matched against the lexicon's fear terms and the intensities of the matched terms (each 0-1) summed, so 0 means no fear term was found and values above 1 mean several were. Dimensionless. Empty where the participant wrote nothing. |
| NRC_Joy | Joy intensity of the participant's open-ended emotion report (EmotionSelfReport), scored with the Dutch term list of the NRC Emotion Intensity Lexicon (NRC-EIL; Mohammad, 2018). The response text and its lemmas, obtained with spaCy's nl_core_news_lg model, were matched against the lexicon's joy terms and the intensities of the matched terms (each 0-1) summed, so 0 means no joy term was found and values above 1 mean several were. Dimensionless. Empty where the participant wrote nothing. |
| NRC_Sadness | Sadness intensity of the participant's open-ended emotion report (EmotionSelfReport), scored with the Dutch term list of the NRC Emotion Intensity Lexicon (NRC-EIL; Mohammad, 2018). The response text and its lemmas, obtained with spaCy's nl_core_news_lg model, were matched against the lexicon's sadness terms and the intensities of the matched terms (each 0-1) summed, so 0 means no sadness term was found and values above 1 mean several were. Dimensionless. Empty where the participant wrote nothing. |
| EngagementIndexFz | Engagement index at Fz (frontal midline, 10-20 system): Beta_Fz divided by the sum of Alpha_Fz and Theta_Fz, the absolute beta-band (13-30 Hz), alpha-band (8-12 Hz) and theta-band (4-7 Hz) powers at Fz computed for this trial (Pope, Bogart & Bartolome, 1995). Dimensionless. Higher values mean relatively more fast-wave than slow-wave activity, read as a higher level of task engagement and alertness during the clip. Empty where the EEG of the trial is missing. |
