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Recurrent processing enhances visual awareness but is not necessary for fast categorization of natural scenes
University of Turku, Finland.
Högskolan i Skövde.
Högskolan i Skövde, Institutionen för biovetenskap. Högskolan i Skövde, Forskningscentrum för Systembiologi. (Kognitiv neurovetenskap och filosofi, Cognitive Neuroscience and Philosophy)ORCID-id: 0000-0002-2771-1588
2014 (Engelska)Ingår i: Journal of cognitive neuroscience, ISSN 0898-929X, E-ISSN 1530-8898, Vol. 26, nr 2, s. 223-231Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Humans are rapid in categorizing natural scenes. Electrophysiological recordings reveal that scenes containing animals can be categorized within 150 msec, which has been interpreted to indicate that feedforward flow of information from V1 to higher visual areas is sufficient for visual categorization. However, recent studies suggest that recurrent interactions between higher and lower levels in the visual hierarchy may also be involved in categorization. To clarify the role of recurrent processing in scene categorization, we recorded EEG and manipulated recurrent processing with object substitution masking while the participants performed a go/no-go animal/nonanimal categorization task. The quality of visual awareness was measured with a perceptual awareness scale after each trial. Masking reduced the clarity of perceptual awareness, slowed down categorization speed for scenes that were not clearly perceived, and reduced the electrophysiological difference elicited by animal and nonanimal scenes after 150 msec. The results imply that recurrent processes enhance the resolution of conscious representations and thus support categorization of stimuli that are difficult to categorize on the basis of the coarse feedforward representations alone.

Ort, förlag, år, upplaga, sidor
MIT Press, 2014. Vol. 26, nr 2, s. 223-231
Nyckelord [en]
adult, animal experiment, article, awareness, brain electrophysiology, classification, controlled study, electroencephalogram, feedback system, female, human, human experiment, image processing, male, nonhuman, normal human, priority journal, striate cortex, task performance, velocity, vision, visual masking, young adult
Nationell ämneskategori
Naturvetenskap
Forskningsämne
Naturvetenskap; Kognitiv neurovetenskap och filosofi
Identifikatorer
URN: urn:nbn:se:his:diva-10453DOI: 10.1162/jocn_a_00486ISI: 000329162600002PubMedID: 24047378Scopus ID: 2-s2.0-84891438271OAI: oai:DiVA.org:his-10453DiVA, id: diva2:773418
Tillgänglig från: 2014-12-18 Skapad: 2014-12-18 Senast uppdaterad: 2019-10-07Bibliografiskt granskad

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