The nature of the inputs to cortical motion detectors
| Autor: | Leonid L. Kontsevich |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
media_common.quotation_subject
Protein subunit Models Neurological Motion Perception Simple cell Motion subunits 050105 experimental psychology Membrane Potentials Motion selectivity Motion 03 medical and health sciences 0302 clinical medicine medicine Animals Contrast (vision) 0501 psychology and cognitive sciences Neurons Afferent Time domain Visual Cortex media_common Physics 05 social sciences Intracellular Sensory Systems Ophthalmology Nonlinear system Electrophysiology Visual cortex medicine.anatomical_structure Receptive field Cats Cortex Factor Analysis Statistical Biological system Neuroscience 030217 neurology & neurosurgery |
| Zdroj: | Vision Research. 35:2785-2793 |
| ISSN: | 0042-6989 |
| DOI: | 10.1016/0042-6989(95)00043-y |
| Popis: | Recently, Jagadeesh, Wheat and Ferster [(1993) Science, 262, 1901–1904] presented intracellular recordings from direction-selective simple cells in primary visual cortex and provided an analysis to support the idea that synaptic summation in simple cells is linear. New analysis presented in this study reveals that: (1) the number of subunits contributing to the analyzed simple cell inputs is two; (2) the subunits are nonlinear in the time domain; (3) each subunit linearly integrates the luminance across the receptive field being, thus, linear to local contrast; (4) the waveforms of the subunit signals are linearly modulated by local contrast at the subunit loci unless the contrast changes its sign; (5) the synaptic summation in the simple cell is linear; (6) nonlinearity of even harmonics has sufficient information for retrieving of relative spatial phase of the subunits and reconstruction of the exact temporal profiles of the subunit signals. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect