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Effect of Visual Cues on the Resolution of Perceptual Ambiguity in Parkinson’s Disease and Normal Aging

Published online by Cambridge University Press:  13 March 2015

Mirella Díaz-Santos
Affiliation:
Department of Psychological and Brain Sciences, Boston University, Boston, Massachusetts
Bo Cao
Affiliation:
Center for Computational Neuroscience and Neural Technology, Boston University, Boston, Massachusetts
Samantha A. Mauro
Affiliation:
Department of Psychological and Brain Sciences, Boston University, Boston, Massachusetts
Arash Yazdanbakhsh
Affiliation:
Center for Computational Neuroscience and Neural Technology, Boston University, Boston, Massachusetts
Sandy Neargarder
Affiliation:
Department of Psychological and Brain Sciences, Boston University, Boston, Massachusetts Department of Psychology, Hart Hall, Bridgewater State University, Bridgewater, Massachusetts
Alice Cronin-Golomb*
Affiliation:
Department of Psychological and Brain Sciences, Boston University, Boston, Massachusetts
*
Correspondence and reprint requests to: Alice Cronin-Golomb, Department of Psychological and Brain Sciences, Boston University, 648 Beacon St., 2nd floor, Boston MA 02215. E-mail: alicecg@bu.edu

Abstract

Parkinson’s disease (PD) and normal aging have been associated with changes in visual perception, including reliance on external cues to guide behavior. This raises the question of the extent to which these groups use visual cues when disambiguating information. Twenty-seven individuals with PD, 23 normal control adults (NC), and 20 younger adults (YA) were presented a Necker cube in which one face was highlighted by thickening the lines defining the face. The hypothesis was that the visual cues would help PD and NC to exert better control over bistable perception. There were three conditions, including passive viewing and two volitional-control conditions (hold one percept in front; and switch: speed up the alternation between the two). In the Hold condition, the cue was either consistent or inconsistent with task instructions. Mean dominance durations (time spent on each percept) under passive viewing were comparable in PD and NC, and shorter in YA. PD and YA increased dominance durations in the Hold cue-consistent condition relative to NC, meaning that appropriate cues helped PD but not NC hold one perceptual interpretation. By contrast, in the Switch condition, NC and YA decreased dominance durations relative to PD, meaning that the use of cues helped NC but not PD in expediting the switch between percepts. Provision of low-level cues has effects on volitional control in PD that are different from in normal aging, and only under task-specific conditions does the use of such cues facilitate the resolution of perceptual ambiguity. (JINS, 2015, 21, 146–155)

Information

Type
Research Articles
Copyright
Copyright © The International Neuropsychological Society 2015 

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