Abstract
Tests of visual search can index the effects of perceptual load and compare the processing efficiency for different object types, particularly when one examines the set-size effect, the increase in search time for each additional stimulus in an array. Previous studies have shown that the set-size effect is increased by manoeuvres that impede object processing, and in patients with object processing impairments. In this study, we examine how the low-level visual impairment of hemianopia affects visual search for complex objects, using a virtual paradigm. Forty-two healthy subjects performed visual search for faces, words, or cars with full-viewing as well as gaze-contingent simulations of complete left or right hemianopia. Simulated hemianopia lowered accuracy and discriminative power and increased response times and set-size effects, similarly for faces, words and cars. A comparison of set-size effects between target absent and target present trials did not show a difference between full-view and simulated hemianopic conditions, and a model of decision-making suggested that simulated hemianopia reduced the rate of accumulation of perceptual data, but did not change decision thresholds. We conclude that simulated hemianopia reduces the efficiency of visual search for complex objects, and that such impairment should be considered when interpreting results from high-level object processing deficits.
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Acknowledgements
This work was supported by Natural Sciences and Engineering Research Council, Discovery Grant RGPIN 319129. JB was supported by Canada Research Chair Tier I, 950-228984, and the Marianne Koerner Chair in Brain Diseases.
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The work of Jason Barton was supported by Canada Excellence Research Chairs, Government of Canada, 950-228984. The data that support the findings of this study are available on request from the corresponding author.
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VM: data curation; investigation; project administration; resources; writing—review & editing. AA: conceptualization; formal analysis; investigation; methodology; project administration; resources; supervision; writing—review & editing. JH: data curation; investigation; methodology; project administration; software; visualization; writing—review & editing. SD: data curation; investigation; methodology; project administration; software; visualization; writing—review & editing. HK: data curation; investigation; project administration; writing—review & editing. JJSB: conceptualization; formal analysis; funding acquisition; methodology; validation; visualization; roles/writing—original draft; writing—review & editing.
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Manouchehri, V., Albonico, A., Hemström, J. et al. The impact of simulated hemianopia on visual search for faces, words, and cars. Exp Brain Res 240, 2835–2846 (2022). https://doi.org/10.1007/s00221-022-06457-w
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DOI: https://doi.org/10.1007/s00221-022-06457-w