多感觉整合的时间再校准

跨通道刺激的时间同步性是多感觉整合的必要条件,但是由于刺激物理传导与神经传导的差异,它们在时间上并非完全匹配。时间再校准指大脑能够适应跨通道刺激间很短的时间延迟的现象,反映了多感觉整合在时间维度上的可塑性,表现为适应相继呈现的跨通道刺激后,主观同时点向时间延迟方向的偏移。本文主要介绍了时间再校准的通道效应与潜在机制,其初始加工阶段,它与刺激内容加工的关系及主要的影响因素。今后的研究应当进一步探索时间再校准能否发生于早期加工阶段,检验其认知过程是否具有双向性,探讨空间选择性注意的作用,并结合神经机制的研究,从综合的视角进行更完善的理论建构。

Quantitative Relationship Between Simultaneous Color Contrast and Hue Difference in Complex Displays

To investigate quantitatively one of the parametric effects——simultaneous color contrast on color appearance and color difference evaluation in complex displays, a set of center/surround combinations of color stimuli were displayed on a color monitor and the perceived color shifts of test targets induced by its surrounds were measured using binocular matching method while systematically varying hue difference between target and surround. When the hue difference increased, the magnitude of color shift in test target decreased, but the deflection angle of color shift vector from constant hue line increased. Regression analyses of experimental data indicated that the relationship between hue angle difference and the magnitude of perceived color shifts could be described quantitatively by an exponential function, and a linear function could describe quantitative relationship between hue angle difference and deflection angle of color shift vector from constant hue line.

间歇性外斜视合并内斜视1例

间歇性外斜视合并内斜视临床较为罕见,我院遇1例,现报告如下。患者女,6岁。于1991年8月10日入院。一周岁时发现左眼内斜,偶尔出现外斜。其弟双眼正常。体检:

刘海遮眼可能会造成弱视

刘海过长,甚至遮住眼睛,可能造成弱视。弱视通常发生于0-7岁,如今却可能发生在年龄更大的人群。现在很多时尚的发型,都把刘海留得过长,甚至遮挡住半只眼睛,这对视力而言是非常糟糕的事情。被发帘遮住一只眼睛,就像戴上一只眼罩,限制进入眼睛的阳光和感官刺激。而且,实际生活中,过长的刘海与毛糙的玻璃片原理相同,视力正常的人容易因此导致近视,

刘海太长导致弱视

刘海过长,甚至是遮住眼睛,可能造成弱视。澳大利亚验光师协会执行委员安德鲁·霍根警告说,弱视通常发生于0～7岁,如今却可能发生在年龄更大的人群。现在很多时尚的发型,都把刘海留得过长,甚至遮挡住一只眼睛,这对视力而言是非常糟糕的事情。头发遮住眼睛,就像戴上了眼罩。