Investigation of Resource Allocation in Persons with Aphasia for AAC-Related Tasks

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Title: Investigation of Resource Allocation in Persons with Aphasia for AAC-Related Tasks
Author: Petroi, Diana
Abstract: This study investigated resource allocation abilities in persons with aphasia (PWA ) in the presence and absence of competing stimuli across a series of experimental tasks that involved identifying and selecting single symbols and subject -verb -object (SVO ) sentences on a speech generating device (SGD ) . Participants included 10 individuals with Broca’s aphasia and a group of 10 typical individuals matched on assigned variables . A mixed -group design was used to compare the performance of the two groups on single symbol and SVO sentence accuracy and response latency measures . Data were analyzed using a repeated -measures analysis of variance (ANOVA ) . The results revealed that PWA accurately identified significantly (p < .01 ) fewer single symbols and SVO sentences in comparison to matched control participants . Additionally , number of symbols per screen and level of location of symbols had a significant effect (p < .01 ) on accuracy of responses for both groups . Furthermore , there was a significant (p < .05 ) interaction between the listening condition and group variables , indicating that competing stimuli have the potential to slow down the processing of information for PWA . Analysis of response latencies indicated that PWA exhibited longer response latencies across all three listening conditions in contrast to control participants . A significant negative correlation (p < .05 ) was observed between accuracy of responses for the single symbol and SVO sentence tasks and perceptual ratings of task difficulty . In summary , the results of this study indicate that effective and efficient use of SGDs by PWA depends upon several vocabulary organization factors such as the number of symbols on a screen and the specific location of a symbol across several screens . These results suggest that researchers and clinicians may need to consider organizing vocabulary on SGDs in such a manner as to reduce the cognitive demands placed on PWA .
URI: http : / /hdl .handle .net /2346 /23876
Date: 2011-08

Citation

Investigation of Resource Allocation in Persons with Aphasia for AAC-Related Tasks. Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /23876 .

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