视动刺激生理心理反应的实验研究

３０名男性军校学员。在两种指导语指导下,经受了一系列视动跃跃刺激（５、１０、１５、２０、３０、４０、６０、８０、１００、１２０度／秒）,每个刺激持续２０秒。用磁带机记录被试的视动性眼震信号,同时,记录被试视动性错觉出现的潜伏期和错觉量。视动性眼震信号在７Ｔ１７信息处理仪上进行脱机采样处理,错觉量用模糊集途径进行量化。主要结论如下：１．视动性眼震的快相速度、慢性速度、快相幅度、慢性幅度均随刺激速度增加而增大,在６０－１２０度／秒范围达到峰值后,基本维持稳定状态,而快慢相时间却有相反的变化趋势,其随刺激速度增加而减小,在６０度／秒达到最低值,然后略有回升。２．在５－１２０度／秒内,视动性错觉随刺激速度的增加而增大,呈直线上升。３．视动性眼震与视动性错觉不存在因果关系。低速度视动刺激下,当视动性眼震被抑制时,错觉量明显增大,说明视动性眼震减轻了视动性错觉。     

Two hands are better than one: a new assessment method and a new interpretation of the non-visual illusion of self-touch

A simple experimental paradigm creates the powerful illusion that one is touching one’s own hand even when the two hands are separated by 15 cm. The participant uses her right hand to administer stimulation to a prosthetic hand while the Examiner provides identical stimulation to the participant’s receptive left hand. Change in felt position of the receptive hand toward the prosthetic hand has previously led to the interpretation that the participant experiences self-touch at the location of the prosthetic hand, and experiences a sense of ownership of the prosthetic hand. Our results argue against this interpretation. We assessed change in felt position of the participant’s receptive hand but we also assessed change in felt position of the participant’s administering hand. Change in felt position of the administering hand was significantly greater than change in felt position of the receptive hand. Implications for theories of ownership are discussed.     

Observational drawing biases are predicted by biases in perception: Empirical support of the misperception hypothesis of drawing accuracy with respect to two angle illusions

We tested the misperception hypothesis of drawing errors, which states that drawing accuracy is strongly influenced by the perceptual encoding of a to-be-drawn stimulus. We used a highly controlled experimental paradigm in which nonartist participants made perceptual judgements and drawings of angles under identical stimulus exposure conditions. Experiment 1 examined the isosceles/scalene triangle angle illusion; congruent patterns of bias in the perception and drawing tasks were found for 40 and 60° angles, but not for 20 or 80° angles, providing mixed support for the misperception hypothesis. Experiment 2 examined shape constancy effects with respect to reproductions of single acute or obtuse angles; congruent patterns of bias in the perception and drawing tasks were found across a range of angles from 29 to 151°, providing strong support for the misperception hypothesis. In both experiments, perceptual and drawing biases were positively correlated. These results are largely consistent with the misperception hypothesis, suggesting that inaccurate perceptual encoding of angles is an important reason that nonartists err in drawing angles from observation.     

Sampling the process of autobiographical memory construction

In three autobiographical memory retrieval experiments participants reported the contents of consciousness to a probe presented at early and late points during retrieval. Classification of the protocols according to the specificity of the reported knowledge found that early in retrieval abstract knowledge predominated whereas at the later point, close to generation or formation of a memory, knowledge related to specific events was more frequent. For some memories very fast and full retrieval was observed at the early point and this was independent of other concurrent processing demands. These findings show that generative retrieval entails iterative access of autobiographical knowledge but this is not observed in direct retrieval.     

Mueller-Lyer illusion and size estimation performance in schizophrenics compared to normal controls

A size estimation (SE) paradigm and the Mueller-Lyer (ML) illusion were used to examine perceptual disturbances in schizophrenics. 35 reliably diagnosed (DSM III-R) schizophrenics were compared to 20 subjects with no history of psychiatric illness. Perceptual distortions found in previous studies of schizophrenics were only to a certain extent confirmed in the present results. More overestimators were found among the schizophrenics than among the normals on the SE task. The schizophrenics, first of all the chronic patients, also proved to be more prone to the Mueller-Lyer illusion. A reason why the very clear differences between schizophrenics and normals found in previous examinations were not confirmed in the present study, might be that a reliable diagnostic instrument was for the first time used in this kind of study.     

利用反诱导消除McCollough效应

ＭｃＣｏｌｌｏｕｇｈ效应在完全黑暗和自然视觉条件下的消退过程很缓慢,而利用同频补色条栅来进行反诱导,能在十几分钟内消除显色效应。消除所用时间与反诱导条栅的亮度、颜色和栅条间距（空间频率）有关。进一步说明导致ＭｃＣｏｌｌｏｕｇｈ效应恢复平衡的主要因素跟网膜刺激方式有关。     

老年人声音诱发闪光错觉的大脑静息态低频振幅

声音诱发闪光错觉(sound-induced flash illusion, SiFI)是一种听觉占主导性的多感觉整合现象, 即当视觉闪光伴随不相等数量的听觉声音在100 ms内相继或同时呈现时, 个体会错觉性地知觉到视觉闪光的个数与听觉声音的数量相等。本研究分别将老年人群体和年轻人群体的声音诱发闪光错觉量(裂变错觉和融合错觉)与全脑的静息态低频振幅(amplitude of low-frequency fluctuation, ALFF)进行相关分析, 考察老年人群体声音诱发闪光错觉效应与大脑静息状态自发活动区域的关系。结果发现, 无论是裂变错觉还是融合错觉, 老年人声音诱发闪光错觉均增大。对于裂变错觉, 老年人的错觉量与内侧前额叶皮层的自发活动呈显著正相关; 对于融合错觉, 老年人的错觉量与额下回、额中回和颞下回的自发活动呈显著正相关, 与枕上回和舌回的自发活动呈现显著的负相关。结果表明, 老年人声音诱发闪光错觉量增大的原因与大脑中多个脑区的静息态自发活动存在关系。     

多感觉整合中的声音诱发闪光错觉效应

声音诱发闪光错觉效应是典型的视听整合错觉现象, 是指当视觉闪光刺激与间隔100 ms内的听觉声音刺激不等数量呈现时, 被试知觉视觉闪光的数量与听觉声音的数量相等。声音诱发闪光错觉的影响因素既包括自下而上和自上而下的被试内差异因素, 也包括视听刺激依赖程度、视听整合的发展和视听刺激知觉敏感性等被试间差异因素。该效应的产生在时程上主要体现在早期加工阶段, 在脑区上主要涉及多处皮层及皮层下相关脑区。未来研究应进一步考察注意、奖赏和视听整合方式等认知加工对声音诱发闪光错觉的影响, 同时也应该关注声音诱发闪光错觉对记忆和学习的影响以及结合计算模型和神经科学的手段进一步探讨其认知神经机制。