Local capture in Balint's syndrome: effects of grouping and item familiarity

Cognitive Neuropsychology
Lilach ShalevG W Humphreys

Abstract

We assessed the factors contributing to local capture in G.K., a patient with Balint's syndrome. G.K. found it difficult to identify the global shape of a compound stimulus, and his poor identification of the global shape was not resolved by introducing familiar local stimuli that were either from the same category as the global target but not tied to a response (Experiment 1) or that belonged to a different category to the target (Experiment 2). Effects of item familiarity were tested by examining local capture from Hebrew letters on compound English letters. Prior to training with the Hebrew letters, G.K. was able to identify the global compounds (Experiment 3a). In contrast, after training with the letters, there was a significant increase in local capture (Experiment 3b). Two additional experiments examined effects of local grouping. Local capture was reduced when the local elements were rectangles or ellipses and grouped by closure of local elements (Experiment 4). Global discrimination also improved when local items were unfamiliar rectangular figure eights (Experiment 5a). However, these grouping effects were counteracted by effects of familiarity when the local elements were changed slightly to become familiar number ei...Continue Reading

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Citations

Jan 13, 2010·Experimental Brain Research·Kirsten A DalrympleAlan Kingstone
Jul 2, 2010·Experimental Brain Research·Elisabeth Huberle, Hans-Otto Karnath
Feb 26, 2010·Cognitive Neuropsychology·Kirsten A DalrympleTodd C Handy
Nov 10, 2011·Journal of Cognitive Neuroscience·Magdalena ChechlaczGlyn W Humphreys
Jun 5, 2014·Journal of Cognitive Neuroscience·Daniela BalslevHans-Otto Karnath
Aug 20, 2010·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Kirsten A DalrympleAlan Kingstone
Aug 3, 2010·Cortex; a Journal Devoted to the Study of the Nervous System and Behavior·Pedro R MontoroGlyn W Humphreys
May 23, 2009·Vision Research·Kirsten A DalrympleAlan Kingstone
Jan 13, 2017·Journal of Clinical and Experimental Neuropsychology·Daniela D'ImperioValentina Moro
Mar 4, 2021·Research in Developmental Disabilities·Giulia MattavelliCostanza Papagno

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