Time-dependent cortical asymmetries induced by emotional arousal

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Time-dependent cortical asymmetries induced by emotional arousal EEG analysis of event-related synchronization and desynchronization in Individually defined frequency bands Ljubomir I. Aftanas, Anton A. Varlamov, Sergey V. Pavlov, Viktor P. Makhnev, Natalya V. Reva 2001 Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Questions raised by the article: Do interhemispheric asymmetries, emerging during affective processing and indexed by ERD/ERS measures, vary with the judged arousal of an affective picture foreground? If so, when, where and at which frequencies does this occur? Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

The experiment International Affective Picture System (IAPS) stimuli with low, moderate and high arousal (LA, MA and HA) content, 62-channel EEG, Skin Conductance Response (SCR), Heart Rate (HR). Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

The experiment Participants are instructed to attend to the pictures, No overt response is required, to keep inherent affective reactions to these stimuli. Event-related desynchronization (ERD) and synchronization (ERS) theta and alpha frequency band was measured Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Sequence of one experimental trial Blank screen then small cross for 4s Presentation of a picture for 6s Total length of EEG epoch recorded : 12s (5s before and 7s after picture onset) The IAPS stimuli are subjectively rated using the Self-Assessment Manikin Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Arousal / Valence Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

IAPS Stimuli Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Self-Assessment Manikin (SAM) Pleasure Arousal Dominance Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Results Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Results Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Results Theta, alpha-1 and alpha-3 bands : effects of arousal discrimination. Theta and alpha-3 bands : association with hemispheric asymmetries in the anterior /posterior direction of the cortical plane. Discriminative properties of theta synchronization in the time period of 100- 700ms post-stimulus. In the alpha-1 and alpha-3 bands, discriminative process : 800-1200ms. Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Conclusions The skin conductance and heart rate data provided important support that picture differences are attributable to emotional arousal. Affective processing seems to be frequency- dependent, the theta oscillating networks were the fastest in affect discrimination. Time-dependence of hemispheric asymmetries induced by affective processing. Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Conclusions Posterior regions of the right hemisphere involved in the modulation of emotion-related arousal (theta and alpha-3 bands). Anterior regions of the left hemisphere (theta and alpha-3 bands) : valence dimension. Are there really hemispheric asymmetries ? There is no physiological facts which assert the existence of an asymmetry in the emotional expression. Seminar BCI - Presentation – Adrien Cognée – March 12th 2009

Thanks