期刊
VISION RESEARCH
卷 50, 期 3, 页码 300-314出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.visres.2009.11.016
关键词
Face perception; Face space; Norm-based coding; Face discrimination; Adaptation aftereffect; Tuning curves
资金
- Australian Research Council [DP0450636, DP0984558]
- Australian Research Council [DP0450636, DP0984558] Funding Source: Australian Research Council
Recent evidence has shown that face space represents facial identity information using two-pool opponent coding. Here we ask whether the shape of the monotonic neural response functions underlying such coding is linear (i.e. face space codes all equal-sized physical changes with equal sensitivity) or nonlinear (e.g. face space shows greater coding sensitivity around the average face). Using adaptation aftereffects and pairwise discrimination tasks, our results for face attributes of eye height and mouth height demonstrate linear shape: including for bizarre faces far outside the normal range. We discuss how linear coding explains some results in the previous literature, including failures to find that adaptation enhances face discrimination, and suggest possible reasons why face space can maintain detailed coding of values far outside the normal range. We also discuss specific nonlinear coding models needed to explain other findings, and conclude face space appears to use a mixture of linear and nonlinear representations. (C) 2009 Elsevier Ltd. All rights reserved.
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