Spatial frequency and orientation tuning dynamics in area V1. Export

@article{Mazer02:SpatialFrequency, abstract = {Spatial frequency (SF) and orientation tuning are intrinsic properties of neurons in primary visual cortex (area V1). To investigate the neural mechanisms mediating selectivity in the awake animal, we measured the temporal dynamics of SF and orientation tuning. We adapted a high-speed reverse-correlation method previously used to characterize orientation tuning dynamics in anesthetized animals to estimate efficiently the complete spatiotemporal receptive fields in area V1 of behaving macaques. We found that SF and orientation tuning are largely separable over time in single neurons. However, spatiotemporal receptive fields also contain a small nonseparable component that reflects a significant difference in response latency for low and high SF stimuli. The observed relationship between stimulus SF and latency represents a dynamic shift in SF tuning, and suggests that single V1 neurons might receive convergent input from the magno- and parvocellular processing streams. Although previous studies with anesthetized animals suggested that orientation tuning could change dramatically over time, we find no substantial evidence of dynamic changes in orientation tuning.}, address = {Department of Psychology, University of California, Berkeley, CA 94720, USA.}, author = {Mazer, J. A. and Vinje, W. E. and McDermott, J. and Schiller, P. H. and Gallant, J. L.}, citeulike-article-id = {479040}, citeulike-linkout-0 = {http://dx.doi.org/10.1073/pnas.022638499}, citeulike-linkout-1 = {http://www.pnas.org/content/99/3/1645.abstract}, citeulike-linkout-2 = {http://www.pnas.org/content/99/3/1645.full.pdf}, citeulike-linkout-3 = {http://www.pnas.org/cgi/content/abstract/99/3/1645}, citeulike-linkout-4 = {http://view.ncbi.nlm.nih.gov/pubmed/11818532}, citeulike-linkout-5 = {http://www.hubmed.org/display.cgi?uids=11818532}, day = {5}, doi = {10.1073/pnas.022638499}, issn = {0027-8424}, journal = {Proc Natl Acad Sci U S A}, keywords = {adaptation, integral, vision}, month = {February}, number = {3}, pages = {1645--1650}, posted-at = {2008-03-11 19:13:42}, priority = {2}, title = {Spatial frequency and orientation tuning dynamics in area V1.}, url = {http://dx.doi.org/10.1073/pnas.022638499}, volume = {99}, year = {2002} }

TY - JOUR ID - Mazer02:SpatialFrequency L3 - citeulike-article-id:479040 N2 - Spatial frequency (SF) and orientation tuning are intrinsic properties of neurons in primary visual cortex (area V1). To investigate the neural mechanisms mediating selectivity in the awake animal, we measured the temporal dynamics of SF and orientation tuning. We adapted a high-speed reverse-correlation method previously used to characterize orientation tuning dynamics in anesthetized animals to estimate efficiently the complete spatiotemporal receptive fields in area V1 of behaving macaques. We found that SF and orientation tuning are largely separable over time in single neurons. However, spatiotemporal receptive fields also contain a small nonseparable component that reflects a significant difference in response latency for low and high SF stimuli. The observed relationship between stimulus SF and latency represents a dynamic shift in SF tuning, and suggests that single V1 neurons might receive convergent input from the magno- and parvocellular processing streams. Although previous studies with anesthetized animals suggested that orientation tuning could change dramatically over time, we find no substantial evidence of dynamic changes in orientation tuning. IS - 3 JF - Proc Natl Acad Sci U S A SN - 0027-8424 AD - Department of Psychology, University of California, Berkeley, CA 94720, USA. EP - 1650 TI - Spatial frequency and orientation tuning dynamics in area V1. VL - 99 SP - 1645 KW - adaptation KW - integral KW - vision AU - Mazer, JA AU - Vinje, WE AU - McDermott, J AU - Schiller, PH AU - Gallant, JL PY - 2002/02/05/ UR - http://dx.doi.org/10.1073/pnas.022638499 ER -