Journal
NEURON
Volume 55, Issue 1, Pages 103-117Publisher
CELL PRESS
DOI: 10.1016/j.neuron.2007.06.017
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Funding
- NEI NIH HHS [R01-EY017396, R01 EY017396, R21 EY016441, R21-EY016441, R21 EY016441-01, R01 EY017396-01] Funding Source: Medline
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The visual cortex represents stimuli through the activity of neuronal populations. We measured the evolution of this activity in space and time by imaging voltage-sensitive dyes in cat area V1. Contrast-reversing stimuli elicit responses that oscillate at twice the stimulus frequency, indicating that signals originate mostly in complex cells. These responses stand clear of the noise, whose amplitude decreases as 1/frequency, and yield high-resolution maps of orientation preference and retinotopy. We first show how these maps are combined to yield the responses to focal, oriented stimuli. We then study the evolution of the oscillating activity in space and time. In the orientation domain, it is a standing wave. In the spatial domain, it is a traveling wave propagating at 0.2-0.5 m/s. These different dynamics indicate a fundamental distinction in the circuits underlying selectivity for position and orientation, two key stimulus attributes.
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