PDF pending restoration
ERIC Number: ED139787
Record Type: RIE
Publication Date: 1977-May
Reference Count: 0
Influence of Stimulus Symmetry and Complexity upon Haptic Scanning Strategies During Detection, Learning and Recognition Tasks.
Locher, Paul J.; Simmons, Roger W.
Two experiments were conducted to investigate the perceptual processes involved in haptic exploration of randomly generated shapes. Experiment one required subjects to detect symmetrical or asymmetrical characteristics of individually presented plastic shapes, also varying in complexity. Scanning time for both symmetrical and asymmetrical shapes increased with increased shape complexity; a significantly greater amount of time was required to identify symmetrical shapes than asymmetrical shapes. It was observed from videotape recordings that subjects used serial/self-terminating scanning strategies to examine asymmetrical shapes and parallel/exhaustive strategies to examine symmetrical shapes. The strategy adopted by the subject was directed by an orienting response; its role in haptic information processing is elaborated. The second experiment required subjects to learn a set of shapes and then attempt to recognize these "old" shapes when presented together with a series of "new" shapes. Again, reaction time increased as a function of stimulus complexity for both learning and recognition of symmetrical and asymmetrical shapes. Serial scanning strategies were used almost exclusively to examine asymmetrical shapes during both tasks and were used 51 percent of the time for learning and recognizing symmetrical shapes. An orienting response was again observed to direct the subject's scanning strategy on both tasks. The time required to recognize "old" and "new" asymmetrical shapes was comparable but faster than the time needed to learn the shapes. In contrast, for symmetrical shapes, the mean scanning time for learning and recognition of "new" shapes was equivalent but slower than the time required to recognize "old" shapes. The influence of stimulus properties and task requirements upon reaction time and scanning strategies are discussed. (MB)
Publication Type: Reports - Research
Education Level: N/A
Authoring Institution: N/A
Note: Portions of this paper presented at the Annual Conference, North American Society for the Psychology of Sport and Physical Activity (Ithaca, New York, May 24, 1977)