Cerebral Cortex Advance Access published online on December 3, 2007
Cerebral Cortex, doi:10.1093/cercor/bhm210
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Functional Organization of Temporal Frequency Selectivity in Primate Visual Cortex
1 Medical Sciences Training Program, 2 Cognitive and Integrative Neuroscience Program, 3 Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37232, 4 Center for Molecular and Behavioral Neuroscience, Rutgers University, Newark, NJ 07102, 5 Departments of Psychology, 6 Ophthalmology and Visual Science, Vanderbilt University, Nashville, TN 37232
Address correspondence to Vivien A. Casagrande, PhD, Department of Cell and Developmental Biology, Vanderbilt Medical School, Vanderbilt University, U3218 Learned Lab, 465 21st Avenue South, Nashville, TN 37232-8240, USA. Email: vivien.casagrande{at}vanderbilt.edu.
Several studies have shown that neurons with similar response properties are arranged together in domains across primary visual cortex (V1). An orderly pattern of domains has been described for preferences to ocular dominance, orientation, and spatial frequency. Temporal frequency preference, another important attribute of the visual scene, also might be expected to map into different domains. Using optical imaging and a variety of quantitative methods, we examined how temporal frequency selectivity is mapped in V1 of the prosimian primate, bush baby (Otolemur garnetti). We found that unlike other attribute maps, selectivity for different temporal frequencies is arranged uniformly across V1 with no evidence of local clustering. Global tuning for temporal frequency, based on magnitude of response, showed a good match to previous tuning curves for single neurons. A peak response was found around 2.0 Hz, with smaller attenuation at lower temporal frequencies than at higher frequencies. We also examined whether the peak temporal frequency response differed between anatomical compartments defined by cytochrome oxidase (CO). No significant differences in the preference for temporal frequency were found between these CO compartments. Our findings show that key sensory attributes that are linked in perception can be organized in quite distinct ways in V1 of primates.
Key Words: bush baby • columns • cytochrome oxidase • optical imaging • orientation preference • striate cortex
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