时间：6月25日 (周四)  18:00-20:00

地点：恕园28号楼205室

主题：工作进展和文献报告

1、工作进展：精神分裂症患者奖惩加工的神经机制-基于概率反转学习任务的研究   

主讲：金佳佳 同学

2、工作进展：重度抑郁症患者概率反转学习缺损的脑电研究

主讲：王雨 同学

3、文献汇报：对自然场景的注视时长由记忆编码而非处理需求来决定 

主讲：沈雨琦 同学

欢迎老师与同学们踊跃出席！

脑科学研究所

文献详细信息

题目：Fixation duration on natural scenes is explained by memory encoding not processing demand

期刊名称：Nature Neuroscience     IF: 20 SCI: Q1     中科院：一区

摘要：Before each of around 200,000 eye movements we make each day, the brain decides how long to fixate before shifting gaze to new information. Here we investigate this process using a large-scale scene-viewing experiment (4,080 natural scenes, five participants) that combines magnetoencephalography, eye tracking and a semantic captioning task. Using multivariate analysis of magnetoencephalography source-space patterns, behavioral analyses and artificial neural network (ANN) modeling, we show that longer fixations do not reflect prolonged visual processing but relate to downstream memory encoding. First, temporal variability of ventral stream representational dynamics did not explain variability in fixation duration. Second, fixation durations were anticorrelated with ANN-estimated patch classification difficulty. Third, fixation durations correlate positively with ANN-predicted patch memorability and caption-inclusion and co-occur with increased theta–gamma phase–amplitude coupling, particularly in frontal and hippocampal regions. These results indicate that eye-movement timing decisions are shaped by memory-encoding demands rather than by perceptual processing limits.