This study assessed the efficiency with which young and older adults of varying field dependence extract information from traffic signs. It also indentified some visual attributes of signs which affect recognition time. Two experiments were conducted. In experiment 1, digitized signs, embedded in rural and urban backgrounds, were presented on a computer monitor. Subjects indicated on which side a target sign had appeared. Analysis showed that recognition times were dependent on age and field-dependence scores. Also, visual backgrounds and spatial frequency of pictographs affected RTs. In experiment 2, recognition RT to 2 signs with redesigned pictographs was measured as well as time taken to detect signs. The signs showing reduced spatial frequency were the fastest to recognize, although, no effect was noticed during detection. The subjects who showed the worst performance when facing the original signs benefitted the most from the modifications.
Abstract