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Transcript
Unconscious processing of visual saliency Ryota Kanai, Vincent Walsh Institute of Cognitive Neuroscience and Department of Psychology University College London The goal: disentangle functions of attention areas (FEF and IPS) Motivation: Attention related areas show similar responses to attentional tasks. We would like to know how FEF and IPS play functionally distinct roles. Hypothesis: IPS is involved in bottom-up saliency computation, and FEF is involved in forming task set (template). Difficulty (part of the hypothesis): Task set is also triggered by bottom-up events. So FEF appears to be stimulus driven (e.g. responses to saliency). So usually FEF and IPS behave in a similar way. How do we tackle the problem? We look at cortical responses to two types of attention capturing stimuli outside awareness. 1. Present an array of stimuli with a pop-out target to the suppressed eye. Left Eye + Right Eye QuickTi me™ and a T IFF (P ackB i ts) decom pressor are needed to see t his pict ure. + The goal is to see lateralized responses to the pop-out target in FEF and IPS Proposed fMRI study Conditions to compare: Target in left visual field Target absent Target in right visual field Event-related design e.g.) LV abs Each stimulus 3 sec Inter trial interval: 3~8 sec RV LV 6min scan (45 trials) x 4 visible + 4 invisible runs
