Ursino Mauro, La Cara Giuseppe-Emiliano, Ritrovato Matteo
Department of Electronics, Computer Science, and Systems, University of Bologna, Cesena, Italy.
Comput Biol Med. 2007 Mar;37(3):398-414. doi: 10.1016/j.compbiomed.2006.05.002. Epub 2006 Jul 18.
Two models of a single hypercolumn in the primary visual cortex are presented, and used for the analysis of direction selectivity in simple cells. The two models differ as to the arrangement of inhibitory connections: in the first ("antiphase model") inhibition is in phase opposition with excitation, but with a similar orientation tuning; in the second ("in-phase model"), inhibition is in phase with excitation, but with broader orientation tuning. Simulation results, performed by using drifting gratings with different orientations, and different spatial and temporal frequencies, show that both models are able to explain the origin of direction preference of simple cells.
本文提出了初级视觉皮层中单个超柱的两种模型，并用于分析简单细胞的方向选择性。这两种模型在抑制性连接的排列上有所不同：在第一种模型（“反相模型”）中，抑制与兴奋呈反相，但具有相似的方向调谐；在第二种模型（“同相模型”）中，抑制与兴奋同相，但具有更宽的方向调谐。通过使用具有不同方向、不同空间和时间频率的漂移光栅进行的模拟结果表明，这两种模型都能够解释简单细胞方向偏好的起源。
