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講座名稱 Attention to multiple objects facilitates their integration in prefrontal and parietal cortex.
主講人 蔡人傑 
講座日期 2017-02-24
講座時間 13:10-15:10
講座地點 社科院北棟2樓心理學系階梯教室
英文演說
主辦系所 心理學系
備註   演講相關內容如下:

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間:2/24(五)1310

地點:社科院北棟2樓心理系階梯教室

講題:Attention to multiple objects facilitates their integration in prefrontal and parietal cortex.

個人CV:如附件

演講摘要:

Selective attention is a top-down process that modulates neural activity depending on task demand and surrounding context. Electrophysiological studies showed that simultaneous attention to a single or several isolated objects enhances their corresponding responses in the visual cortex. Thus, attention is generally considered in terms of modulation of individual object representations. However, objects in daily life often occur in groups, such as buildings in a city and vegetables in a grocery store. How does attention affect neural response of multiple nearby objects? Does attention highlight individual objects simultaneously only, or does attention modulate the neural interaction between targets? Furthermore, how does attention relate to perceptual integration? Previous studies show that perceptual integration of adjacent stimuli correlates with an interaction component in the neural response. Does attention facilitate this activity when two objects are attended and suppress it when only one is attended? Previous investigators measured single-cell or fMRI responses, which combined the response to individual stimuli as well as their potential interaction. Here, we leverage the spatial and temporal fidelity of human electrocorticography and a frequency-tagging technique to directly measure responses corresponding to individual objects and to their interaction. When subjects attend to two adjacent stimuli, prefrontal and parietal cortex show a selective enhancement of only the neural interaction between stimuli, but not the responses to individual stimuli. When only one stimulus is attended, the neural response to that stimulus is selectively enhanced in prefrontal and parietal cortex. In contrast, early visual areas generally manifest responses to individual stimuli and to their interaction regardless of attentional task, although a subset of the responses is modulated similarly to prefrontal and parietal cortex. Causal network analysis reveals reciprocal connections between early visual cortex and higher executive centers in a task-dependent manner. Thus, integration of two stimuli is enhanced when they are both attended, and prefrontal and parietal cortices preferentially manifest this combined representation. In addition to representing task-relevant stimuli, prefrontal and parietal cortex plays an important role in the parsing of visual information.

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相關資料下載 UW_CV_jjt.pdf