Download - Global visual form & motion processing in adults John Wattam-Bell Dee Birtles Sheila Moazzami …
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