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Analysis of Visually Psychological Phenomena Using Electroencephalograph

脑电图分析视觉心理现象

基本信息

批准号：
11680859
负责人：
TSUDA Ryoichi
金额：
$ 1.34万
依托单位：
Kyushu Tokai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

Apparent motion is a perceptual phenomenon of motion that occurs when at least two spatially separated visual stimuli are presented under appropriate temporal conditions. After the presentation of alternating apparent motion stimuli, motion perception is replaced by the cessation of motion, breakdown. This study investigates the neural activities of the brain using steady-state visual evoked potentials (SS-VEPs) during continuous perception of visual motion. Psychophysical measurements were taken to analyze the stimulus conditions that induce coherent apparent motion. Time till breakdown (TTB) was used as a measurement of motion strength in alternate motion.The results showed that the optimal stimulus condition for inducing coherent motion was (a) between 2 Hz and 3 Hz temporal frequency and (b) less than 2 degrees of stimulus separation. SS-VEPs in response to continuously alternating apparent motion stimuli with 2 Hz of temporal frequency and with 2 degree of spatial separation were measured (apparent motion perception). For the control condition, SS-VEPs, in response to two point simultaneous presented stimuli were also measured. A prominent positive peak around the same latencies, particularly over the right occipital and temporal regions, was observed for SS-VEPs responses to apparent motion stimulation.To investigate the localization of the neural sources, brain evoked magnetic fields in response to apparent motion stimuli were measured using a whole-head magnetometer. Peak magnetic fields were observed in the latency range of at around 180 msec after the stimulus onset. The neural sources in this epoch were estimated to lie in the border between occipital and temporal areas in the contra-lateral hemisphere, which corresponds to the extrastriate visual cortex, including the middle temporal area.These results suggest that the larger positive potentials elicited over the right occipital to temporal region continuously perceive apparent motion.

视在运动是一种运动的感知现象，当至少两个空间上分离的视觉刺激在适当的时间条件下呈现时发生。在呈现交替的明显运动刺激后，运动知觉被运动的停止、崩溃所取代。本研究利用稳态视觉诱发电位（SS-VEP）研究了连续视觉运动感知过程中大脑的神经活动。采取心理物理测量来分析诱导连贯的表观运动的刺激条件。用直到崩溃的时间（TTB）作为交替运动中运动强度的测量指标，结果表明，诱导连贯运动的最佳刺激条件为：（a）时间频率在2 ~ 3 Hz之间，（B）刺激间隔小于2度。测量了对具有2 Hz时间频率和2度空间分离的连续交替表观运动刺激的SS-VEP（表观运动感知）。对于控制条件，SS-VEP，在两个点同时呈现的刺激，也进行了测量。一个突出的正峰周围相同的lavelets，特别是在右枕叶和颞叶区域，观察SS-VEP响应明显的运动stimulation.To调查的神经源的本地化，脑诱发的磁场响应明显的运动刺激使用全头磁力计测量。在刺激开始后约180毫秒的潜伏期范围内观察到峰值磁场。估计这一时期的神经源位于对侧半球枕颞交界处，相当于纹外视皮层，包括颞中区，提示右侧枕颞区诱发的较大正电位持续感知视运动。