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10-20 International System of Electrode Placement.

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Presentation on theme: "10-20 International System of Electrode Placement."— Presentation transcript:

1 10-20 International System of Electrode Placement

2 EEG site pairings

3 Cortical connectivity

4 Homologues active together

5 Brain Homologues

6 Callosal Connections

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

8 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

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

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

11 Homotopic inhibition theory



14 Approach (F3) and withdraw (F4) modules

15 Hypermodulation

16 Task induced laterality, both genders

17 Gender Baseline Laterality differences

18 Task-Gender processing interaction


20 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)

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