Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision | Previous revision Next revision Both sides next revision | ||
|
shared:research [2015/01/22 10:34] |
shared:research [2019/10/02 14:07] justin old revision restored (2019/10/01 14:10) |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| + | |||
| + | ^ Attentional enhancement via selection and pooling of early sensory responses in human visual cortex ^^^ | ||
| + | |{{ :shared:efficientselection.png?725x195.75 |}}||| | ||
| + | |Our world is filled with multiple distractions - flashing images on a television screen, blinking lights, blaring horns. How is our brain able to focus attention only on relevant stimuli? The brain might turn up the sensory gain of responses (B above) or turn down noise in sensory cortical circuits responding to the relevant stimulus (C above) - thus enhancing our sensitivity. Alternatively (or in addition to), the brain might efficiently select just the most relevant sensory responses for routing to higher perceptual and action related areas (D above) - thus improving behavioral sensitivity by blocking out irrelevant signals. We studied contrast discrimination performance when subjects were cued to a single (focal attention) or multiple locations (distributed attention), while concurrently measuring cortical responses using fMRI. Using computational models we found that improved behavioral performance could be quantitatively accounted for by a model which included efficient selection of sensory signals using a max-pooling selection rule, but not by models that only allowed behavior to be improved by sensitivity enhancement. The max-pooling rule simply selected responses based on the magnitude of response. We conclude that attention enhanced behavioral performance predominantly by enabling efficient selection of the behaviorally relevant sensory signals.||| | ||
| + | |||
| ====== Overview ====== | ====== Overview ====== | ||
| ^ Overview: Priors in visual perception ^ | ^ Overview: Priors in visual perception ^ | ||