Academic journal article Attention, Perception and Psychophysics

There May Be Only One

Academic journal article Attention, Perception and Psychophysics

There May Be Only One

Article excerpt

ATTENTION MODELING

There May Be Only One

Reynolds & Heeger (2009). The normalization model of attention. Neuron, 61, 168.

Numerous articles in this journal confirm that attention modifies responses to stimuli. What processes at the level of single cells lead to this result? Single-cell recordings in visual cortex have been interpreted as supporting a number of different attentional mechanisms. Some experiments have shown large attentiondependent increases in firing rates at low to intermediate levels of contrast, and more modest effects at high contrast, consistent with an attentiondependent increase in contrast gain. Others support a rate gain model, in which attention causes its most profound effects at high contrast. Still others suggest evidence for attentiondependent sharpening of the neuronal tuning curves, increasing response to a preferred feature (e.g., a specific orientation) and decreasing response to nonpreferred properties. Finally, others support the view that attention shrinks the receptive field to wrap around the attended stimulus, excluding distracting stimuli. …

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