The Influence of Two Figures for Figure–Ground Segmentation in the Thalamus
Ian Max Andolina1; Wei Wang1; Stewart S. Shipp2
2017-07
会议名称2017年第二届曲阜视觉科学会议
通讯作者邮箱i.andolina@ion.ac.cn
会议日期2017.7.2
会议地点曲阜
其他摘要

PURPOSE: A core function for any visual system (biological and artificial) is recognising objects by grouping and filling-in image elements as a figure and segregating them from the background. Neural mechanisms of Figure–Ground (F–G) segmentation have been linked to processes operating across several cortical areas including primary visual cortex (V1), and depend heavily on re-entrant feedback connections. F–G is thought to be a cortical phenomenon, however we recently observed strong F–G modulation in the earliest visual area in the brain, the dorsal lateral geniculate nucleus of the thalamus (LGN). Our previous study assumed that F–G segmentation observed in the LGN was mostly stimulus, and not task driven. By adding a second figure target, we wished to test whether this was the case.
METHODS: We performed tetrode recordings of spiking and local field potentials (LFP) in behaving macaque dLGN. We used speeded reaction–time where the subject had to find, and then saccade to either of two moving-dot defined visual figural objects against a moving background. The choice depended on a simple distance metric.
RESULTS: When we divide attentional demand across two figural objects, we find that LGN cells are differentially driven by both the visual component and the saccaded to location of the task. LFP signal analysis suggests this task activity is driven predominantly within the α–band.
CONCLUSIONS: We find that relay cells in the LGN respond not only to the visual cues alone, but also exhibit differential activity whether the figural object was going to be chosen for a subsequent saccade or not. The α–band dominated LFP suggests feedback as the most parsimonious route of this task driven modulation. Future experiments aim to orthogonally control spatial and feature attention while causally manipulating the feedback using optogenetic approaches.

关键词perception figure-ground LGN attention top-down
语种英语
文献类型会议论文
条目标识符http://ir.psych.ac.cn/handle/311026/22105
专题心理所主办学术会议_2017年第二届曲阜视觉科学会议_会议摘要
通讯作者Ian Max Andolina
作者单位1.Institute of Neuroscience, State Key Laboratory of Neuroscience, Key Laboratory of Primate Neurobiology, Chinese Academy of Sciences
2.UCL Inst. of Ophthalmology
推荐引用方式
GB/T 7714
Ian Max Andolina,Wei Wang,Stewart S. Shipp. The Influence of Two Figures for Figure–Ground Segmentation in the Thalamus[C],2017.
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