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      Distinct perceptual grouping pathways revealed by temporal carriers and envelopes

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      Author
      Rainville, S.
      Clarke, Aaron
      Date
      2008
      Source Title
      Journal of Vision
      Print ISSN
      1534-7362
      Publisher
      Association for Research in Vision and Ophthalmology
      Volume
      8
      Issue
      15
      Pages
      1 - 15
      Language
      English
      Type
      Article
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      Abstract
      S. E. Guttman, L. A. Gilroy, and R. Blake (2005) investigated whether observers could perform temporal grouping in multi-element displays where each local element was stochastically modulated over time along one of several potential dimensions—or “messenger types”—such as contrast, position, orientation, or spatial scale. Guttman et al.'s data revealed that grouping discards messenger type and therefore support a single-pathway model that groups elements with similar temporal waveforms. In the current study, we carried out three experiments in which temporal-grouping information resided either in the carrier, the envelope, or the combined carrier and envelope of each messenger's timecourse. Results revealed that grouping is highly specific for messenger type if carrier envelopes lack grouping information but largely messenger nonspecific if carrier envelopes contain grouping information. These imply that temporal grouping is mediated by several messenger-specific carrier pathways as well as by a messenger-nonspecific envelope pathways. Findings also challenge simple temporal-filtering accounts of perceptual grouping (E. H. Adelson & H. Farid, 1999).
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      http://hdl.handle.net/11693/53546
      Published Version (Please cite this version)
      https://doi.org/10.1167/8.15.9
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