摘要
目的:利用微持续与微间隔时间技术,设计了两组相关的实验,对亮度知觉效应和视觉加工方式进行探讨。方法:实验于2006-06在中南民族大学物理楼脑认知实验室进行,所有受试者为年龄20～25岁的大学本科生,视力(含矫正视力)正常,均为右利手。①实验1:被试为10名(男5名,女5名),要求被试分别对n屏依次呈现的亮块的明度和n+1屏依次呈现的亮块的明度进行比较(n≤17)。②实验2:被试为28名(男13名,女15名),实验涉及两个刺激物,先呈现的刺激物由左右两个大小相同、亮度不同的亮块a和b组成,后呈现的刺激物把a和b的位置进行对调,当这两个刺激物依次显示时,要求被试报告左右两边的明度是否存在差异,存在何种差异。结果:①实验1∶1≤n≤3时,100%的被试报告,n+1屏的明度大于n屏的亮度,即n+1>n;4≤n≤10时,70%～90%的被试报告n+1>n;n>10时,50%～70%的被试报告n+1>n;随着n值的增加明度差异也在减小,大约在n=17时达到稳定,n屏和n+1屏的明度区别将很难被看出。②实验2:在L(a)<L(b)(a的亮度小于b的亮度)条件下,当L(a)=0,20,40,60;L(b)=240,220,200,180时,86%～100%的被试报告左边比右边亮,即a+b>b+a,随着a和b的亮度差异减小,左右两边呈现的明度越相似;同样当L(a)<L(b)时,报告a+b<b+a的情况与在L(a)<L(b)条件下报告的情况相似。结论:实验1的结果表明视觉信息的加工具有叠加效应;实验2的结果说明在视觉信息的加工过程中,不只是存在信息的叠加,并且信息在进入视觉系统后还在不停的衰减。因此,有理由相信,视觉信息加工存在着叠加-衰减的加工方式。
AIM： Using micro-duration and micro-interstimulus interval technology, perceived luminance and visual processing method are discussed in two related experiments.
METHODS： The experiment was accomplished in the Brain Cognitive Science Laboratory of South-Central University for Nationalities in June 2006. The subjects included undergraduates aged 20-25 years and were accustomed to the right hand, with good vision （revised vision）. （1）ln the first experiment, ten undergraduates of either gender were enrolled to compare the brightness of n patch of constant luminance with that of n ＋1 patch of constant luminance （n ≤ 17）.（2）In the second expedment, twenty-eight undergraduates （thirteen men, Fifteen women） were selected. There were two stimulators, one firstly presented was made up with two patches （a and b） of different luminance and same size, whereas the other one later presented exchanged the place of a and b. When these two stimulators appeared in order, subjects were asked to report the difference of both sides＇ brightness.
RESULTS： （1）In the first experiment, 1 ≤n ≤3, all the subjects reported n ＋1〉n ; 4≤n ≤0, 70%-90% subjects reported n ＋1〉n ; n 〉10, 50%-70% subjects reported n ＋1〉n ; And as the n increased, the bdghtness difference was decreasing and almost disappeared when n =17. It was difficult to distinguish the brightness difference between n patch and n ＋1 patch.（2） The second expedment： In L（a）〈L（b） condition, when, L（a）=0,20,40,60;L（b）=240,220,200,180, 86%-100% subjects reported a＋b〉b＋a. And as the difference between a luminance and b luminance decreased, the brightness of two sides was more similar. In L（a）〈L（b） condition, the subjects reported a＋b〈b＋a, which was identical with the subjects in L（a）〈L（b） condition.
CONCLUSION： The first experiment indicates that the visual information is adding during processing. And the second experiment shows that the visual information processing includes not only the information adding but also the information decreasing. So, it is believable that visual information processing exists adding-decreasing method.
出处
《中国组织工程研究与临床康复》
CAS
CSCD
北大核心
2007年第9期1663-1666,共4页
Journal of Clinical Rehabilitative Tissue Engineering Research
