The binocular neural mechanism: disparity coding schemes and population coding  

作　　者：ZHAO Li 

机构地区：[1]Information Engineering Institute, Henan University of Science and Technology

出　　处：《Science China(Information Sciences)》2015年第9期65-78,共14页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China(Grant No.60475021);Program for New Century Excellent Talents in University of Ministry of Education of China(Grant No.NCET-05-0611)

摘　　要：Stereoacuity thresholds measured on disparity pedestals are generally found to increase exponential- ly as the pedestals move away from horopters. However, Farell et al. recently found that for sinusoidal stimuli this threshold function had a dip a pedestal effect. This paper examines the underlying neural mechanism. We suggest a general disparity coding scheme with two position parameters, which are necessary to account for the phenomenon that the response of the energy model depends on the absolute phase of the stimulus. This scheme was implemented to simulate the responses, calculated from an energy model, of the neurons of a full V1 cortical column. To explain the stereo pedestal effect, we propose a decoding mechanism, which is first processed along the phase dimension and then along the orientation dimension. The final step of the decoding mechanism, probability summation over the outputs of spatial frequency channels, yields the dip, producing a disparity increment threshold function similar to the psychophysical result.Stereoacuity thresholds measured on disparity pedestals are generally found to increase exponential- ly as the pedestals move away from horopters. However, Farell et al. recently found that for sinusoidal stimuli this threshold function had a dip a pedestal effect. This paper examines the underlying neural mechanism. We suggest a general disparity coding scheme with two position parameters, which are necessary to account for the phenomenon that the response of the energy model depends on the absolute phase of the stimulus. This scheme was implemented to simulate the responses, calculated from an energy model, of the neurons of a full V1 cortical column. To explain the stereo pedestal effect, we propose a decoding mechanism, which is first processed along the phase dimension and then along the orientation dimension. The final step of the decoding mechanism, probability summation over the outputs of spatial frequency channels, yields the dip, producing a disparity increment threshold function similar to the psychophysical result.

关 键 词：STEREOPSIS disparity discrimination disparity coding increment thresholds neural integration 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] R338.3[自动化与计算机技术—计算机科学与技术]