Global visual form & motion processing in adults

John Wattam-Bell

Dee Birtles

Sheila Moazzami

…

This study

• identify form & motion fMRI activation in adults

• compare with 128-channel ERPs

- source analysis guided by MRI

• pilot for developmental study

Global form & motion

• multiple extrastriate areas

• scattered throughout dorsal & ventral cortex

• virtually no overlap betweenform and motion

Basic contrast

• Form:

• Motion is similar: arcs = dot trajectories over time

• Also explore parametric responses

Incoherent ↔ coherent transitions

• pseudo-random sequence (event-related design)

• ~150 transitions per run

T = TR = 2-3 sec? 5-8 mins total

task? – eg ‘spot the ball’

• fMRI: at least occipital & parietal, TR 2-3 sec…

• structural MRI & retinotopic mapping

~30 mins total?

• about 5 subjects – healthy adults