NDLI: Large manual pointing errors, but accurate verbal reports, for indications of target azimuth

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Large manual pointing errors, but accurate verbal reports, for indications of target azimuth

Content Provider	PubMed Central
Author	Philbeck, John Sargent, Jesse Arthur, Joeanna Dopkins, Steve
Abstract	Many tasks have been used to probe human directional knowledge, but relatively little is known about the comparative merits of different means of indicating target azimuth. Few studies have compared action-based versus non-action-based judgments for targets encircling the observer. This comparison promises to illuminate not only the perception of azimuths in the front and rear hemispaces, but also the frames of reference underlying various azimuth judgments, and ultimately their neural underpinnings. We compared a response in which participants aimed a pointer at a nearby target, with verbal azimuth estimates. Target locations were distributed between 20 and 340 deg. Non-visual pointing responses exhibited large constant errors (up to −32 deg) that tended to increase with target eccentricity. Pointing with eyes open also showed large errors (up to −21 deg). In striking contrast, verbal reports were highly accurate, with constant errors rarely exceeding +/− 5 deg. Under our testing conditions, these results are not likely to stem from differences in perception-based vs. action-based responses, but instead reflect the frames of reference underlying the pointing and verbal responses. When participants used the pointer to match the egocentric target azimuth rather than the exocentric target azimuth relative to the pointer, errors were reduced.
Starting Page	511
File Format	PDF
ISSN	14684233
e-ISSN	14684233
Journal	Perception
Issue Number	4
Volume Number	37
Language	English
Publisher Date	2008-01-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Ophthalmology Experimental and Cognitive Psychology Artificial Intelligence Sensory Systems

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