Unique semantic space in the brain of each beholder predicts perceived similarity

被引:123
作者
Charest, Ian [1 ]
Kievit, Rogier A. [1 ]
Schmitz, Taylor W. [1 ]
Deca, Diana [2 ]
Kriegeskorte, Nikolaus [1 ]
机构
[1] MRC, Cognit & Brain Sci Unit, Cambridge CB2 7EF, England
[2] Tech Univ Munich, Inst Neurosci, D-80802 Munich, Germany
基金
欧洲研究理事会; 英国医学研究理事会;
关键词
visual perception; object representations; representational similarity analysis; neuroimaging; memory; VENTRAL TEMPORAL CORTEX; HUMAN EXTRASTRIATE CORTEX; PRIMARY VISUAL-CORTEX; OBJECT REPRESENTATIONS; CORTICAL REPRESENTATION; RESPONSE PATTERNS; FMRI DATA; PERCEPTION; ACTIVATION; IMAGERY;
D O I
10.1073/pnas.1402594111
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The unique way in which each of us perceives the world must arise from our brain representations. If brain imaging could reveal an individual's unique mental representation, it could help us understand the biological substrate of our individual experiential worlds in mental health and disease. However, imaging studies of object vision have focused on commonalities between individuals rather than individual differences and on category averages rather than representations of particular objects. Here we investigate the individually unique component of brain representations of particular objects with functional MRI (fMRI). Subjects were presented with unfamiliar and personally meaningful object images while we measured their brain activity on two separate days. We characterized the representational geometry by the dissimilarity matrix of activity patterns elicited by particular object images. The representational geometry remained stable across scanning days and was unique in each individual in early visual cortex and human inferior temporal cortex (hIT). The hIT representation predicted perceived similarity as reflected in dissimilarity judgments. Importantly, hIT predicted the individually unique component of the judgments when the objects were personally meaningful. Our results suggest that hIT brain representational idiosyncrasies accessible to fMRI are expressed in an individual's perceptual judgments. The unique way each of us perceives the world thus might reflect the individually unique representation in high-level visual areas.
引用
收藏
页码:14565 / 14570
页数:6
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