Spatial Frequency Integration for Binocular Correspondence in Macaque Area V4 Export

@article{citeulike:4523712, abstract = {Neurons in the primary visual cortex (V1) detect binocular disparity by computing the local disparity energy of stereo images. The representation of binocular disparity in V1 contradicts the global correspondence when the image is binocularly anticorrelated. To solve the stereo correspondence problem, this rudimentary representation of stereoscopic depth needs to be further processed in the extrastriate cortex. Integrating signals over multiple spatial frequency channels is one possible mechanism supported by theoretical and psychophysical studies. We examined selectivities of single V4 neurons for both binocular disparity and spatial frequency in two awake, fixating monkeys. Disparity tuning was examined with a binocularly correlated random-dot stereogram (RDS) as well as its anticorrelated counterpart, whereas spatial frequency tuning was examined with a sine wave grating or a narrowband noise. Neurons with broader spatial frequency tuning exhibited more attenuated disparity tuning for the anticorrelated RDS. Additional rectification at the output of the energy model does not likely account for this attenuation because the degree of attenuation does not differ among the various types of disparity-tuned neurons. The results suggest that disparity energy signals are integrated across spatial frequency channels for generating a representation of stereoscopic depth in V4. 10.1152/jn.00096.2007}, author = {Kumano, Hironori and Tanabe, Seiji and Fujita, Ichiro}, citeulike-article-id = {4523712}, citeulike-linkout-0 = {http://dx.doi.org/10.1152/jn.00096.2007}, citeulike-linkout-1 = {http://jn.physiology.org/content/99/1/402.abstract}, citeulike-linkout-2 = {http://jn.physiology.org/content/99/1/402.full.pdf}, citeulike-linkout-3 = {http://view.ncbi.nlm.nih.gov/pubmed/17959744}, citeulike-linkout-4 = {http://www.hubmed.org/display.cgi?uids=17959744}, day = {1}, doi = {10.1152/jn.00096.2007}, issn = {0022-3077}, journal = {J Neurophysiol}, keywords = {spatial\_frequency, v4}, month = {January}, number = {1}, pages = {402--408}, posted-at = {2009-10-09 15:45:44}, priority = {2}, title = {Spatial Frequency Integration for Binocular Correspondence in Macaque Area V4}, url = {http://dx.doi.org/10.1152/jn.00096.2007}, volume = {99}, year = {2008} }

TY - JOUR ID - citeulike:4523712 L3 - citeulike-article-id:4523712 N2 - Neurons in the primary visual cortex (V1) detect binocular disparity by computing the local disparity energy of stereo images. The representation of binocular disparity in V1 contradicts the global correspondence when the image is binocularly anticorrelated. To solve the stereo correspondence problem, this rudimentary representation of stereoscopic depth needs to be further processed in the extrastriate cortex. Integrating signals over multiple spatial frequency channels is one possible mechanism supported by theoretical and psychophysical studies. We examined selectivities of single V4 neurons for both binocular disparity and spatial frequency in two awake, fixating monkeys. Disparity tuning was examined with a binocularly correlated random-dot stereogram (RDS) as well as its anticorrelated counterpart, whereas spatial frequency tuning was examined with a sine wave grating or a narrowband noise. Neurons with broader spatial frequency tuning exhibited more attenuated disparity tuning for the anticorrelated RDS. Additional rectification at the output of the energy model does not likely account for this attenuation because the degree of attenuation does not differ among the various types of disparity-tuned neurons. The results suggest that disparity energy signals are integrated across spatial frequency channels for generating a representation of stereoscopic depth in V4. 10.1152/jn.00096.2007 IS - 1 JF - J Neurophysiol SN - 0022-3077 EP - 408 TI - Spatial Frequency Integration for Binocular Correspondence in Macaque Area V4 VL - 99 SP - 402 KW - spatial_frequency KW - v4 AU - Kumano, Hironori AU - Tanabe, Seiji AU - Fujita, Ichiro PY - 2008/01/01/ UR - http://dx.doi.org/10.1152/jn.00096.2007 ER -