| Autor: |
Lazereva, N. A., Novikova, R. V., Tikhomirov, A. S., Shevelev, I. A. |
| Zdroj: |
Neurophysiology; November 1986, Vol. 18 Issue: 6 p569-574, 6p |
| Abstrakt: |
The response pattern and orientation detection of "timer" and "scanner" neurons were investigated in awake, immobilized cats with reduced contrast (2.3 and 10.0) between the light stimulus and the background. These two divisions had already been made [3, 5] at a high contrast level of 100. During this action, all scanners were found to retain their properties: they did not change into timers. The number of timers, however, dropped to 40% of their original total. The relationship between the properties of neurons belonging to these groups remained as it was during maximum contrast: with timers, response began and peaked earlier; it was also of higher frequency and briefer, while its capacity for orientation detection was far inferior to that of scanners. The neurons leaving the timer group following a reduction in contrast manifested a pattern somewhere between timer and scanner cells, resembling the latter in a number of parameters. Findings confirmed the deduction that both timer and scanner neurons are present and operate consistently under a wide range of conductions in the cat visual cortex; the former fulfill the functions of synchronizers and the latter of directional filters which are rearranged in time [5]. |
| Databáze: |
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