Detailed measurement of ganglion cell receptive fields often reveals significant deviations from a smooth, Gaussian profile. We studied the effect of these irregularities on the representation of fine spatial information in the retina. We recorded from nearby clusters of ganglion cells, testing their ability to determine the location of small flashed spots, and we compared the results to the pr...

linguistic/cultural differences of learners’ native language with english as a foreign language, gender and english proficiency level are among those numerous variables which affect english learning and its quality in iranian context. the present study was an attempt to illuminate the effects of these variables on performing integrative approach of general english tests (cloze test and recall t...

Receptive fields in primary visual cortex have been shown to be capable of rapid expansion and contraction when exposed to an artificial scotoma, a masked segment of the visual field. To distinguish cortical from thalamic contributions to receptive field mutability, we tested interocular transfer of the effect in binocular cortical receptive fields, presenting the conditioning stimulus to the f...

Visual receptive fields of superior colliculus neurons were investigated. The latencies of "on" and "off" responses were measured and their distribution all over the field was mapped. In 36 percent of the receptive fields the latency of the "off" response was shorter than the latency of the "on" response; 19 percent of the receptive fields had almost equal latencies; in 13 percent the latency o...

The response properties and receptive field organization of 106 LSA neurons were investigated in pretrigeminal preparations using moving dark and bright stimuli with particular reference to the dynamic and static structure of receptive fields. About 61percent neurons revealed equal sensitivity to the motions of dark and bright stimuli. A majority of them had an ON-OFF static structure of recept...

The fine structure of the receptive fields of the lateral suprasylvian area neurons was investigated in the pretrigeminal cat preparation. A majority of the receptive fields consisted of subregions with different qualitative characteristics according to their response to moving visual stimuli. There was an asymmetry in the spatial distribution of inhibitory mechanisms over the receptive field. ...