United States Department of Transportation
i
Road sign recognition during computer testing versus driving simulator performance for stroke and stroke+aphasia groups.
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2015-07-01
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[PDF-857.73 KB]
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Abstract:Driving is essential to maintaining independence. For most Americans preserving personal mobility is a
key element to retaining jobs, friends, activities and the basic necessities to maintain a household. This
is particularly true for older people. However, as the general age of the US increases, more and more
people are becoming at greater risk for neurologic diseases such as stroke. Brain damage from stroke
can affect physical mobility, sensorimotor, cognition, communication, visual perception, and visual
processing which are all critical processes needed for driving. Currently, there is no consistent way to
determine when a person can return to driving poststroke. Most driving studies exclude people with
poststroke aphasia (PWA). However, aphasia may result in the inability to recognize and interpret the
words, symbols, and gestures on road signs, which will impact safe driving. This paper presents the
results of a recent study that tested road sign interpretation tasks among groups of healthy and
poststroke older drivers to assess the effects of poststroke aphasia on driving. The results showed that
aphasia significantly impacted accuracy and response time of road sign interpretation. More
importantly, however, as language and symbol complexity increased on road signs, the aphasia-affected
drivers performed with less accuracy and required more time. Although poststroke aphasia has not
been taken into account in most stroke-related driving research, these findings suggest further research
is warranted and may have implications for the design of road signs and healthcare professionals who
make decisions about when a PWA may safely return to driving.
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