10-20 International System of Electrode Placement

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Presentation transcript:

10-20 International System of Electrode Placement

EEG site pairings

Cortical connectivity

Homologues active together

Brain Homologues

Callosal Connections

Find the non-homotopic (i.e., heterotopic) connections

Principle of Callosal Homotopy Arnold (1838-1840) – Anatomical tables – first mention of callosal homotopic connectivity Myers (1850s) – popularized homotopic principle Bremer (1956) – “general principle of homotopy” based on Curtis (1940;1944) electrophysiological studies Four types of cortico-cortical projections: 1) homotopic, 2) homoareal, 3) heterotopic, and 4) ipsilateral

Reciprocity in Callosal Connections Reciprocity of callosal connections: strong homotopic connectivity, and wherever there is heterotopic connections, ipsilateral connections exist to same areas.

Callosal Function Models 1. Transfer of information 2. Inhibition of opposite side processing 3. Homotopic inhibition, generating complementary percepts (e.g., content in context)

Homotopic inhibition theory

Approach (F3) and withdraw (F4) modules

Hypermodulation

Task induced laterality, both genders

Gender Baseline Laterality differences

Task-Gender processing interaction

Appetitive or goal-directed behavior F3 – pregoal attainment positive affect ?F4 – pregoal attainment negative affect Postgoal attainment positive affect is another form (contentment, offline PFC)