摘要：  PURPOSE: To understand how similar VWM content affects encoding and representation of coming up visual stimulus and why an unambiguous prior stimulus can cause an ambiguous stimulus to be perceived in the same way.
METHODS: We hypothesize that the prior unambiguous SFM can evoke a pre-activation representation in MT+ and affect the representation of the coming up ambiguous SFM, and holding it into visual working memory could enhance such effect. To test this hypothesis, we carry out two behavioral experiments. In the first experiment, subjects are asked to watch a serial of unambiguous SFM-delay-ambiguous SFM with two tasks, one for attending only and another for holding the rotation speed of the unambiguous SFM into the working memory. The second experiment is performed toimpair the pre-activation representation in MT+. We present distractors to reduce the pre-activation representations in MT+ during the delay period. We use visual stimulus in MT+ localizer run to maximize the active MT+ activity and also, impair the pre-activation representation.
RESULTS: In the experiment 1, results show that the visual working memory tasks could strengthen the perceptual bias of unambiguous SFM significantly (p< 0.01). In the experiment 2, results show that with distractors presented, the perceptual bias level will be greatly impaired (p< 0.001), but at the same time, the VWM accuracy is little affected (p= 0.58). CONCLUSION: Our results suggest that the perceptual bias phenomenon is closely related to the persist pattern representations in MT+ evoked by VWM.

关键词:  , Visual Working Memory, Perceptual Memory, Bi-stable Perception

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