Pattern adaptation is one of the fundamental sensory processes in the visual system. In this study, we compared pattern adaptation induced by two types of sinu-soidal drifting grating in dLGN cells of cat. The two typ...Pattern adaptation is one of the fundamental sensory processes in the visual system. In this study, we compared pattern adaptation induced by two types of sinu-soidal drifting grating in dLGN cells of cat. The two types of grating have the same parameters (e.g. spatial frequency, temporal frequency and contrast) except their pattern shapes, one of which is normal grating and the other annular grating. The results suggested that the annular grating elic-ited stronger response and stronger pattern adaptation than the normal grating. This is consistent with the adaptation and aftereffect to the two types of drifting gratings seen in psychology and may reflect the subcortical neural mecha-nism underlying these psychological phenomena.展开更多
To investigate the effects of short-term intra- ocular pressure (IOP) elevation on the receptive field proper- ties of lateral geniculate nucleus (LGN) cells, responses of the LGN cells to annulus, disc and drifting g...To investigate the effects of short-term intra- ocular pressure (IOP) elevation on the receptive field proper- ties of lateral geniculate nucleus (LGN) cells, responses of the LGN cells to annulus, disc and drifting gratings with high or low spatial frequencies have been recorded extracellularly in the cat with the retinal perfusion pressure kept stable (30 mmHg). Our results indicated that the responses of the X and Y type LGN cells were significantly weakened during IOP elevation. And the responses varied with the different mechanisms of receptive fields. Specifically, while using an- nulus and disc as stimuli, the responses of Y cells were more tolerant than X cells to IOP elevation. The surround area of the receptive field was more sensitive to IOP elevation than the center. The mean responses during IOP elevation de- creased more than the peak responses did. IOP elevation has more influence on the responses of X cells than on the re- sponse of Y cells to the drifting gratings with high spatial frequency. These results may reflect different degrees of ischemia on corresponding retinal structures caused by IOP elevation.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.30070257)the Foundation of the Chinese Academy of Sciences(Grant No.KGCX2-SW-101)Visual Information Processing Laboratory of Institute of Biophysics,the Chinese Academy of Sciences.
文摘Pattern adaptation is one of the fundamental sensory processes in the visual system. In this study, we compared pattern adaptation induced by two types of sinu-soidal drifting grating in dLGN cells of cat. The two types of grating have the same parameters (e.g. spatial frequency, temporal frequency and contrast) except their pattern shapes, one of which is normal grating and the other annular grating. The results suggested that the annular grating elic-ited stronger response and stronger pattern adaptation than the normal grating. This is consistent with the adaptation and aftereffect to the two types of drifting gratings seen in psychology and may reflect the subcortical neural mecha-nism underlying these psychological phenomena.
文摘To investigate the effects of short-term intra- ocular pressure (IOP) elevation on the receptive field proper- ties of lateral geniculate nucleus (LGN) cells, responses of the LGN cells to annulus, disc and drifting gratings with high or low spatial frequencies have been recorded extracellularly in the cat with the retinal perfusion pressure kept stable (30 mmHg). Our results indicated that the responses of the X and Y type LGN cells were significantly weakened during IOP elevation. And the responses varied with the different mechanisms of receptive fields. Specifically, while using an- nulus and disc as stimuli, the responses of Y cells were more tolerant than X cells to IOP elevation. The surround area of the receptive field was more sensitive to IOP elevation than the center. The mean responses during IOP elevation de- creased more than the peak responses did. IOP elevation has more influence on the responses of X cells than on the re- sponse of Y cells to the drifting gratings with high spatial frequency. These results may reflect different degrees of ischemia on corresponding retinal structures caused by IOP elevation.
