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Nothdurft CVS of orientation color and facial expressions VPL-reports 10.pdf 1,83MB
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1000 Titel
  • Dynamic differences in the identification of orientation, color, and facial expressions
1000 Verantwortlich
  • Hans-Christoph Nothdurft, Visual Perception Laboratory (VPL) Göttingen
1000 Autor/in
  1. Nothdurft, Hans-Christoph |
1000 Katalog Id
  • HT020346414
1000 Erscheinungsort Göttingen, Germany
1000 Verlag [Hans-Christoph Nothdurft, Visual Perception Laboratory (VPL)]
1000 Erscheinungsjahr 2020
1000 Erschienen in VPL-reports , 10 (2020)
1000 Art der Datei
1000 Publikationstyp
  1. Monografie |
  2. Report |
1000 FRL-Sammlung
1000 Sprache der Publikation
1000 Abstract/Summary
  • The paradigm of cued visual selection (Nothdurft, 2017a, www.vpl-reports.de/6/) was tested on different features and the dynamics in the identification of orientation targets, color targets, and facial expressions were compared. In large arrays of up to 80 items, one item (the target) was cued at various delays after stimulus onset; observers had to identify this item and report its properties. Performance accuracy was measured for different presentation times, Δt, after the cue. With all features, accuracy improved with longer presentations. The data were fitted with cumulative Gaussian functions and the presentation time for 75% correct responses, Δt75, was estimated for each pattern and each cue delay; the values reflect the dynamics and relative strengths of underlying neural signals. For orientation, discrimination was strongly accelerated at cue delays 50-100 ms after the pattern onset. With longer delays, it slowed down again. For color, the acceleration was stronger and more prolonged. It started earlier and reached its maximum about 400 ms after stimulus onset. With longer delays, performance deteriorated but never fell back to the level at zero delay. With facial expressions, the required presentation times were generally increased; faster discrimination at short delays was less pronounced and not seen in all observers. Shortest Δt75 values were reached 50-200 ms after stimulus onset, at similar delays as for orientation. All data were used to reconstruct the signals that provide the cued discrimination of orientation, color, and facial expressions. The link to neurophysiological studies and the evidence for different impacts of these features on the control of spatial attention are discussed. © Autho
1000 Sacherschließung
Medizin und Gesundheit
1000 DOI 10.4126/FRL01-006418668 |
1000 Dateien
  1. Dynamic differences in the identification of orientation, color, and facial expressions
1000 Umfang
  • 1 Online-Ressource (27 Seiten)
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1000 Erstellt am 2020-01-28T08:55:17.618+0100
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  1. oai:frl.publisso.de:frl:6418668 |
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