Outline: Visual Attention




Parietal lobe lesions
Hemi-neglect
Is this a failure of visual attention?
Other lesion effects
V1 lesions - blindness and blind-sight
Cut corpus collosum - split-brain syndrome
Visual attention
Eye movements and directed/overt attention
Covert attention
"Pre-attentive" texture segmentation
Visual search
Feature search - parallel, no change in reaction time with increase in number of distractors
Conjunction or other difficult searches - serial, linear increase in RT with set size, slope twice as large for "no" than for "yes" responses
Change blindness and the attentional bottleneck
Neural correlates of visual attention in parietal cortex and extrastriate areas
Other specialized areas: Fusiform face area, Posterior parietal area (faces and places)