Spatial and temporal sensitivity of X- and Y-cells in dorsal lateral geniculate nucleus of the cat.

نویسندگان

  • S Lehmkuhle
  • K E Kratz
  • S C Mangel
  • S M Sherman
چکیده

1. We measured spatial and temporal sensitivity of 81 X-cells and 46 Y-cells in the lateral geniculate nucleus of cats by determining contrast thresholds of single cells to counterphased, sine-wave gratings. The plots of contrast sensitivity (reciprocal of the contrast threshold) as a function of spatial or temporal frequency of the sine-wave grating represent the contrast sensitivity functions. 2. The spatial contrast sensitivity functions were measured at a temporal frequency (counterphase rate) of 2 cycles/s. The shape of the function for X-cells was an inverted U. Contrast sensitivity peaked around OS1.0 cycles/deg, and decreased at lower and higher spatial frequencies. Contrast sensitivity of Y-cells was highest at low spatial frequencies, and systematically declined at higher spatial frequencies. By virtue of the relative shapes of these functions, Ycells were more sensitive at low spatial frequencies than were X-cells. At high spatial frequencies, X-cells were slightly more sensitive. Spatial resolution, defined as the highest spatial frequency to which the cell responded at 0.6 contrast, declined monotonically with eccentricity of receptivefield location from the area centralis for both Xand Y-cells, and X-cells had a slightly higher average resolution than did Y-cells at most eccentricities. 3. Temporal contrast sensitivity functions were measured using the spatial frequency to which the cell exhibited the lowest contrast threshold. The shapes of the

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عنوان ژورنال:
  • Journal of neurophysiology

دوره 43 2  شماره 

صفحات  -

تاریخ انتشار 1980