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10-20 International System of Electrode Placement
EEG site pairings
Homologues active together
Find the non-homotopic (i.e., heterotopic) connections
Principle of Callosal Homotopy Four types of cortico-cortical projections: 1) homotopic, 2) homoareal, 3) heterotopic, and 4) ipsilateral Arnold ( ) – 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
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
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)
The consensus view of memory + a self module + the constructive memory framework (CMF) = The best functional Account of memory there is… The End (of lecture.
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