Blakeslee Barbara, McCourt Mark E
Center for Visual Neuroscience, Department of Psychology, North Dakota State University, Fargo, ND 58105-5075, USA.
J Vis. 2008 Feb 29;8(2):15.1-8. doi: 10.1167/8.2.15.
Brightness induction is the modulation of the perceived intensity of a region by the luminance of surrounding regions and reveals fundamental properties of neural organization in the visual system. Grating induction affords a unique opportunity to precisely measure the temporal properties of induction using a quadrature motion technique. Contrary to previous reports that induction is a sluggish process with temporal frequency cutoffs of 2-5 Hz (R. L. DeValois, M. A. Webster, K. K. DeValois, & B. Lingelbach, 1986; A. F. Rossi & M. A. Paradiso, 1996), we find that induction is nearly instantaneous. The temporal response of induced brightness differs from that of luminance gratings by a small time lag (<1 ms), or by a small temporal phase lag (<0.016 cycle), and remains relatively constant across wide variations in test field height. These data are not easily explained by an edge-dependent, homogeneous filling-in process (A. F. Rossi & M. A. Paradiso, 1996); however, they are consistent with an explanation of brightness induction based on spatial filtering by cortical simple cells (B. Blakeslee & M. E. McCourt, 1999).
明度诱导是指周围区域的亮度对某一区域感知强度的调制，它揭示了视觉系统中神经组织的基本特性。光栅诱导提供了一个独特的机会，可使用正交运动技术精确测量诱导的时间特性。与之前报道的诱导是一个缓慢过程，时间频率截止为2 - 5赫兹的观点相反（R. L. 德瓦洛伊斯、M. A. 韦伯斯特、K. K. 德瓦洛伊斯和B. 林格尔巴赫，1986年；A. F. 罗西和M. A. 帕拉迪索，1996年），我们发现诱导几乎是瞬间发生的。诱导明度的时间响应与亮度光栅的时间响应相差一个小的时间延迟（<1毫秒），或一个小的时间相位延迟（<0.016周期），并且在测试场高度的广泛变化中保持相对恒定。这些数据不容易用基于边缘依赖的均匀填充过程来解释（A. F. 罗西和M. A. 帕拉迪索，1996年）；然而，它们与基于皮层简单细胞的空间滤波对明度诱导的解释是一致的（B. 布莱克斯利和M. E. 麦考特，1999年）。
