题目：Competing rhythmic neural representations of orientations during concurrent attention to multiple orientation features

主讲人：莫测 博士

时间：2019年11月28日（周四）16:00-17:00

地点：心理学院301会议室

摘要：When a feature is attended, all locations containing this feature are enhanced throughout the visual field. However, how the brain concurrently attends to multiple features remains unknown and cannot be easily deduced from classical attention theories. In this talk, I will present our recent findings of a rhythm-based, time-multiplexing neural machinery underlying concurrent multi-feature attention. We recorded human magnetoencephalography signals when subjects concurrently attended to two spatially overlapping orientations. A time-resolved multivariate inverted encoding model was employed to track the ongoing temporal courses of the neural representations of the attended orientations. We show that the two orientation representations alternate with each other and undergo a theta-band (~4 Hz) rhythmic fluctuation over time. Similar temporal profiles are also revealed in the orientation discrimination performance. Computational modeling suggests a tuning competition process between the two neuronal populations that are selectively tuned to one of the attended orientations. Taken together, our findings revealed for the first time a rhythmic attention spotlight in the feature space.

个人信息：莫测博士毕业于北京大学生命科学联合中心，获整合生命科学（心理学）博士学位，华南师范大学心理学院博士后，研究兴趣为视知觉与注意的认知神经机制。在攻读博士学位期间曾获国家奖学金、北京大学校长奖学金、北京大学三好学生、石青云院士基金奖、Cognitive Neuroscience Society年会Graduate Student’s Award等多项荣誉，于Nature Communications, Journal of Neuroscience等高水平学术期刊发表文章多篇。