Grouping in object recognition: The role of a Gestalt law in letter identification
| Autor: | Denis G. Pelli, Melanie Palomares, Najib J. Majaj, Christopher J. Christian, Noah Raizman, Edward Y. Kim |
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| Rok vydání: | 2009 |
| Předmět: |
Offset (computer science)
Letter identification Snake letters Cognitive Neuroscience Experimental and Cognitive Psychology Principles of grouping computer.software_genre Contour integration Article 050105 experimental psychology Contrast Sensitivity Discrimination Learning Gestalt 03 medical and health sciences Everyday experience 0302 clinical medicine Arts and Humanities (miscellaneous) Grouping Developmental and Educational Psychology Humans 0501 psychology and cognitive sciences Discrimination learning Features Dot lattice business.industry 05 social sciences Cognitive neuroscience of visual object recognition Snake in the grass Recognition Psychology Cognition Object recognition Good continuation Neuropsychology and Physiological Psychology Pattern Recognition Visual Gestalt psychology Artificial intelligence Psychological Theory Psychology business computer Photic Stimulation 030217 neurology & neurosurgery Natural language processing Cognitive psychology |
| Zdroj: | Cognitive Neuropsychology |
| ISSN: | 1464-0627 0264-3294 |
| Popis: | The Gestalt psychologists reported a set of laws describing how vision groups elements to recognize objects. The Gestalt laws “prescribe for us what we are to recognize ‘as one thing’” (Köhler, 1920). Were they right? Does object recognition involve grouping? Tests of the laws of grouping have been favourable, but mostly assessed only detection, not identification, of the compound object. The grouping of elements seen in the detection experiments with lattices and “snakes in the grass” is compelling, but falls far short of the vivid everyday experience of recognizing a familiar, meaningful, named thing, which mediates the ordinary identification of an object. Thus, after nearly a century, there is hardly any evidence that grouping plays a role in ordinary object recognition. To assess grouping in object recognition, we made letters out of grating patches and measured threshold contrast for identifying these letters in visual noise as a function of perturbation of grating orientation, phase, and offset. We define a new measure, “wiggle”, to characterize the degree to which these various perturbations violate the Gestalt law of good continuation. We find that efficiency for letter identification is inversely proportional to wiggle and is wholly determined by wiggle, independent of how the wiggle was produced. Thus the effects of three different kinds of shape perturbation on letter identifiability are predicted by a single measure of goodness of continuation. This shows that letter identification obeys the Gestalt law of good continuation and may be the first confirmation of the original Gestalt claim that object recognition involves grouping. |
| Databáze: | OpenAIRE |
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