Abstract：
:How does a visual search goal modulate the activity of neurons encoding different visual features (e.g., color, direction of motion)? Previous research suggests that goal-driven attention enhances the gain of neurons representing the target's visual features. Here, we present mathematical and behavioral evidence that this strategy is suboptimal and that humans do not deploy it. We formally derive the optimal feature gain modulation theory, which combines information from both the target and distracting clutter to maximize the relative salience of the target. We qualitatively validate the theory against existing electrophysiological and psychophysical literature. A surprising prediction is that it is sometimes optimal to enhance nontarget features. We provide experimental evidence toward this through psychophysics experiments on human subjects, thus suggesting that humans deploy the optimal gain modulation strategy.
journal_name
Neuronjournal_title
Neuronauthors
Navalpakkam V,Itti Ldoi
10.1016/j.neuron.2007.01.018subject
Has Abstractpub_date
2007-02-15 00:00:00pages
605-17issue
4eissn
0896-6273issn
1097-4199pii
S0896-6273(07)00038-4journal_volume
53pub_type
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