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
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
Four types of cortico-cortical projections:
1) homotopic, 2) homoareal, 3) heterotopic, and 4) ipsilateral

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)