Influence of contrast on the responses of marmoset lateral geniculate cells to drifting gratings

被引:33
作者
Kremers, J
Silveira, LCL
Kilavik, BE
机构
[1] Univ Tubingen, Hosp Eye, Dept Expt Ophthalmol, D-72076 Tubingen, Germany
[2] Fed Univ Para, Dept Fisiol, BR-66075900 Belem, Para, Brazil
关键词
D O I
10.1152/jn.2001.85.1.235
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
The responses of lateral geniculate nucleus (LGN) cells in the common marmoset (Callithrix jacchus) to drifting luminance or cone isolating gratings of different spatial frequencies and contrasts were measured. The response noise, defined as the variability of the responses to single sweeps in the complex plane, was independent of stimulus contrast and spatial frequency but increased with increasing overall responsiveness of the cell. The signal-to-noise ratio of parvocellular (PC) cells was smaller than of magnocellular (MC) cells. At each contrast, the response amplitude as a function of spatial frequency could be described with a difference of Gaussians model. With this model, the sizes and the peak sensitivities of the receptive field centers and surrounds were estimated. It was found that receptive field center and surround sizes of LGN cells decrease slightly with increasing contrast. Further, the peak sensitivity decreases with increasing contrast. The two factors are involved in a decrease in responsivity (the response per unit contrast) with increasing contrast which is compatible to response saturation for low spatial frequency stimuli. PC cells did not saturate as much to luminance stimuli although some saturation was found with cone isolating gratings. We found that the response phase lag of both PC and MC cells decreased with increasing contrast, which cannot be explained on the basis of linear response behavior. Apparently the phase of LGN cell responses to drifting gratings is altered in comparison with the retinal inputs by additional nonlinearities.
引用
收藏
页码:235 / 246
页数:12
相关论文
共 30 条
[1]   The receptive field of the primate P retinal ganglion cell .1. Linear dynamics [J].
Benardete, EA ;
Kaplan, E .
VISUAL NEUROSCIENCE, 1997, 14 (01) :169-185
[2]   RESPONSE VARIABILITY IN RETINAL GANGLION-CELLS OF PRIMATES [J].
CRONER, LJ ;
PURPURA, K ;
KAPLAN, E .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1993, 90 (17) :8128-8130
[3]   RECEPTIVE-FIELDS OF P-GANGLION AND M-GANGLION CELLS ACROSS THE PRIMATE RETINA [J].
CRONER, LJ ;
KAPLAN, E .
VISION RESEARCH, 1995, 35 (01) :7-24
[4]   THE RECEPTIVE-FIELD ORGANIZATION OF X-CELLS IN THE CAT - SPATIOTEMPORAL COUPLING AND ASYMMETRY [J].
DAWIS, S ;
SHAPLEY, R ;
KAPLAN, E ;
TRANCHINA, D .
VISION RESEARCH, 1984, 24 (06) :549-564
[5]   SPATIO-TEMPORAL INTERACTIONS IN CAT RETINAL GANGLION-CELLS SHOWING LINEAR SPATIAL SUMMATION [J].
ENROTHCUGELL, C ;
ROBSON, JG ;
SCHWEITZERTONG, DE ;
WATSON, AB .
JOURNAL OF PHYSIOLOGY-LONDON, 1983, 341 (AUG) :279-307
[6]   CONTRAST SENSITIVITY OF RETINAL GANGLION CELLS OF CAT [J].
ENROTHCUGELL, C ;
ROBSON, JG .
JOURNAL OF PHYSIOLOGY-LONDON, 1966, 187 (03) :517-+
[7]   SPATIOTEMPORAL FREQUENCY RESPONSES OF CAT RETINAL GANGLION-CELLS [J].
FRISHMAN, LJ ;
FREEMAN, AW ;
TROY, JB ;
SCHWEITZERTONG, DE ;
ENROTHCUGELL, C .
JOURNAL OF GENERAL PHYSIOLOGY, 1987, 89 (04) :599-628
[8]   ENHANCEMENT OF LUMINANCE FLICKER BY COLOR-OPPONENT MECHANISMS [J].
GOURAS, P ;
ZRENNER, E .
SCIENCE, 1979, 205 (4406) :587-589
[9]   THE PRIMATE RETINA CONTAINS 2 TYPES OF GANGLION-CELLS, WITH HIGH AND LOW CONTRAST SENSITIVITY [J].
KAPLAN, E ;
SHAPLEY, RM .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1986, 83 (08) :2755-2757
[10]  
KAPLAN E, 1982, J PHYSIOL-LONDON, V330, P125, DOI 10.1113/jphysiol.1982.sp014333