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The Journal of Neuroscience, March 1, 2002, 22(5):1976-1984
Dynamics of Spatial Frequency Tuning in Macaque V1
C. E. Bredfeldt1 and D. L. Ringach1, 2, 3 1 Departments of Psychology and 2 Neurobiology, 3 Brain Research Institute, University of California, Los Angeles, Los Angeles, California 90095
Spatial frequency tuning in the lateral geniculate nucleus of the thalamus (LGN) and primary visual cortex (V1) differ substantially. LGN responses are largely low-pass in spatial frequency, whereas the majority of V1 neurons have bandpass characteristics. To study this transformation in spatial selectivity, we measured the dynamics of spatial frequency tuning using a reverse correlation technique. We find that a large proportion of V1 cells show inseparable responses in spatial frequency and time. In several cases, tuning becomes more selective over the course of the response, and the preferred spatial frequency shifts from low to higher frequencies. Many responses also show suppression at low spatial frequencies, which correlates with the increases in response selectivity and the shifts of preferred spatial frequency. These results indicate that suppression plays an important role in the generation of bandpass selectivity in V1.
Key words: primate vision; striate cortex; spatial frequency tuning; response suppression; dynamic tuning; quality factor
Copyright © 2002 Society for Neuroscience 0270-6474/02/2251976-09$05.00/0
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