Spatial attention in V4: a biophysical model
نویسندگان
چکیده
منابع مشابه
Spatial attention effects in macaque area V4.
Focal visual attention typically produces enhanced perceptual processing at the psychological level and relatively stronger neural responses at the physiological level. A longstanding mechanistic question is whether these attentional effects pertain specifically to the attended (target) object or to the region of space it occupies. We show here that attentional response enhancement in macaque a...
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Electrophysiological experiments in V4 visual area have shown that spatial attention induces a number of neural activity modulations. Depending on the stimulus characteristics, neuronal firing rates either increase or decrease. At the network level, the oscillatory activity in the gamma frequency range (30-70 Hz) is enhanced by attention. Recently, pyramidal neurons and interneurons have been s...
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Attention typically amplifies neuronal responses evoked by task-relevant stimuli while attenuating responses to task-irrelevant distracters. In this context, visual distracters constitute an external source of noise that is diminished to improve attended signal quality. Activity that is internal to the cortex itself, stimulus-independent ongoing correlated fluctuations in firing, might also act...
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Attention can facilitate visual processing, emphasizing specific locations and highlighting stimuli containing specific features. To dissociate the mechanisms of spatial and feature-based attention, we compared the time course of visually evoked responses under different attention conditions. We recorded from single neurons in area V4 during a delayed match-to-sample task that controlled both s...
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0 20 40 60 80 100 V2 Firing Rate Hz ABSTRACT Neurons in areas V2 and V4 exhibit stimulus specific tuning. When two stimuli that are differentially preferred by a V4 neuron are simultaneously presented within its receptive field, its response to the pair is intermediate between the responses to either of the two stimuli presented alone. When the animal attends to one of the two stimuli, the resp...
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ژورنال
عنوان ژورنال: BMC Neuroscience
سال: 2007
ISSN: 1471-2202
DOI: 10.1186/1471-2202-8-s2-p15