Adaptation in single units in visual cortex: The tuning of aftereffects in the spatial domain

Visual Neuroscience - Tập 2 Số 6 - Trang 593-607 - 1989
Alan Saul1, M. Cynader2
1University of Pittsburgh
2, University of British Columbia

Tóm tắt

AbstractCat striate cortical neurons were investigated using a new method of studying adaptation aftereffects. Stimuli were sinusoidal gratings of variable contrast, spatial frequency, and drift direction and rate. A series of alternating adapting and test trials was presented while recording from single units. Control trials were completely integrated with the adapted trials in these experiments.Every cortical cell tested showed selective adaptation aftereffects. Adapting at suprathreshold contrasts invariably reduced contrast sensitivity. Significant aftereffects could be observed even when adapting at low contrasts.The spatial-frequency tuning of aftereffects varied from cell to cell. Adapting at a given spatial frequency generally resulted in a broad response reduction at test frequencies above and below the adapting frequency. Many cells lost responses predominantly at frequencies lower than the adapting frequency.The tuning of aftereffects varied with the adapting frequency. In particular, the strongest aftereffects occurred near the adapting frequency. Adapting at frequencies just above the optimum for a cell often altered the spatial-frequency tuning by shifting the peak toward lower frequencies. The fact that the tuning of aftereffects did not simply match the tuning of the cell, but depended on the adapting stimulus, implies that extrinsic mechanisms are involved in adaptation effects.

Từ khóa


Tài liệu tham khảo

10.1364/JOSAA.1.001091

10.1017/S0952523800003539

10.1364/JOSAA.2.000147

10.1126/science.162.3858.1146-a

10.1152/jn.1985.54.3.651

10.1038/298266a0

10.1152/jn.1988.59.4.1314

Marlin, 1986, Interocular transfer of direction-selective adaptation in cat striate cortex cells, Society for Neuroscience Abstracts, 12, 433

10.1126/science.182.4116.1036

10.1016/0042-6989(76)90097-3

10.1016/0042-6989(86)90039-8

10.1007/BF00235938

10.1016/0042-6989(83)90113-X

10.1113/jphysiol.1981.sp013875

10.1113/jphysiol.1974.sp010652

10.1113/jphysiol.1984.sp015092

10.1113/jphysiol.1969.sp008862

Saul, 1985, Adaptation effects from conditioning area 17 cortical units in kittens during physiological recording, Society for Neuroscience Abstracts, 11, 461

Movshon, 1980, Pattern adaptation in striate cortical neurons, Investigative Ophthalmology and Visual Science, 21, 193

von der Heydt, 1978, Movement aftereffects in the visual cortex, Archives of Italian Biology, 116, 248

10.1152/jn.1985.54.3.668

10.1016/0042-6989(76)90160-7

10.1038/278850a0

10.1152/jn.1986.55.5.966

10.1152/jn.1977.40.5.1051

Thông tin
Thông tin xuất bản

Visual Neuroscience

Tập 2 Số 6

593-607

Thông tin tác giả