Receptive Field Properties Resource Of Two Spatial Integrated Cells In Cat V1

In the area of V1, Using drifting sinusoidal gratings or light bar stimuli that can cause cells in V1 generate action potentials, then this particular area of the cell is called the classical receptive field(CRF). There is a surround region beyond the classical receptive field(non-CRF) which is irresponsible to visual stimuli alone, but can modulate the cell?s response. This area is called the non-classical receptive field. There are two different surround integration effect cells in the cat primary visual cortex. the non-classical receptive field(non-CRF)in one type of cells shows an significant inhibitory effect on the cell?s response,the other has non-inhibition and facilitatory effect. These two types of cells have different morphological and Immunochemical characteristics, while there are significant differences about the receptive field properties of these two types of cells.Using extracellular recording methods, We tested 82 primary visual cortex cells including 52 suppressive surround cells(SSCs) and 30 non-suppressive surround cells(nSSCs).we measured the size of the classical receptive field(CRF) with the minimum response field and area-summation measurements, but arises different results in comparison of SSCs and nSSCs. We found nSSCs showed sharper orientation selectivity and narrower tuning width than SSCs. No significant difference was found in direction selectivity between SSCs and nSSCs. Complex cells are more than simple cells in SSCs but less in nSSCs. Furthermore, SSCs have larger peak firing rates than nSSCs.We also studied the stimuli sensitivity between the CRF and non-CRF in anesthetic cats bying varying the relative spatial phase between a center grating bar presented in the CRF and a surround grating bar in the non-CRF. The cell has larger firing rates when the difference is relatively bigger.