First Advisor

David Beversdorf

Date of Award

6-16-2021

Document Type

Thesis

Degree Name

Bachelor of Science (B.S.) in Biology and University Honors

Department

Biology

Language

English

DOI

10.15760/honors.1115

Abstract

Objective: We investigated visuospatial processing in individuals with autism using bisection and quadrisection tasks to evaluate the presence of a possible downward vertical spatial bias that could provide insights into the preference for attending to the mouth in ASD populations.

Methods: Twenty participants with ASD and 20 age, IQ, and sex-matched control participants were recruited (ages 6-23). Participants were asked to bisect, quadrisect from the top, and quadrisect from the bottom vertical lines placed in their left, center, and right visual spaces. Distance from the true midpoint and quadripoint were calculated and compared between the two groups.

Results: No significant difference was found between the ASD and control groups for vertical line bisections or bottom quadrisections. However, ASD participants had a greater deviation above the true top quadripoint than control participants for top quadrisections (t(37)=1.74, p=0.045).

Conclusion: Our results indicate that there is no downward spatial bias in ASD populations, and thus attentional biases are likely not contributing to the mouth preference exhibited by individuals with ASD. Rather, for the top quadrisections there is an upward bias in the ASD group. This may be due to the more local attentional demands of the quadrisection task but needs further investigation.

Rights

In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

Persistent Identifier

https://archives.pdx.edu/ds/psu/35763

Available for download on Saturday, May 27, 2023

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