Recurrent computations for visual pattern completion

TitleRecurrent computations for visual pattern completion
Publication TypeJournal Article
Year of Publication2018
AuthorsTang, H, Schrimpf, M, Lotter, W, Moerman, C, Paredes, A, Caro, JOrtega, Hardesty, W, Cox, D, Kreiman, G
JournalProceedings of the National Academy of Sciences
Date Published08/2018
ISSN0027-8424
KeywordsArtificial Intelligence, computational neuroscience, Machine Learning, pattern completion, Visual object recognition
Abstract

Making inferences from partial information constitutes a critical aspect of cognition. During visual perception, pattern completion enables recognition of poorly visible or occluded objects. We combined psychophysics, physiology, and computational models to test the hypothesis that pattern completion is implemented by recurrent computations and present three pieces of evidence that are consistent with this hypothesis. First, subjects robustly recognized objects even when they were rendered <15% visible, but recognition was largely impaired when processing was interrupted by backward masking. Second, invasive physiological responses along the human ventral cortex exhibited visually selective responses to partially visible objects that were delayed compared with whole objects, suggesting the need for additional computations. These physiological delays were correlated with the effects of backward masking. Third, state-of-the-art feed-forward computational architectures were not robust to partial visibility. However, recognition performance was recovered when the model was augmented with attractor-based recurrent connectivity. The recurrent model was able to predict which images of heavily occluded objects were easier or harder for humans to recognize, could capture the effect of introducing a backward mask on recognition behavior, and was consistent with the physiological delays along the human ventral visual stream. These results provide a strong argument of plausibility for the role of recurrent computations in making visual inferences from partial information.

URLhttp://www.pnas.org/lookup/doi/10.1073/pnas.1719397115
DOI10.1073/pnas.1719397115
Short TitleProc Natl Acad Sci USA

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