| Attenuating the haptic horizontal-vertical curvature illusion. | |
| | |
MedLine Citation:
|
PMID: 20675806 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
In a number of experiments, blindfolded subjects traced convex curves whose verticals were equal to their horizontal extent at the base. Overestimation of verticals, as compared with horizontals, was found, indicating the presence of a horizontal-vertical illusion with haptic curves, as well as with visible curves. Experiment 1 showed that the illusion occurred with stimuli in the frontal plane and with stimuli that were flat on the table surface in vision and touch. In the second experiment, the stimuli were rotated, and differences between vision and touch were revealed, with a stronger illusion in touch. The haptic horizontal-vertical illusion was virtually eliminated when the stimuli were bimanually touched using free exploration at the body midline, but a strong illusion was obtained when curves were felt with two index fingers or with a single hand at the midline. Bimanual exploration eliminated the illusion for smaller 2.5- through 10.2-cm stimuli, but a weakened illusion remained for the largest 12.7-cm patterns. The illusion was present when the stimuli were bimanually explored in the left and right hemispace. Thus, the benefits of bimanual exploration derived from the use of the two hands at the body midline combined with free exploration, rather than from bimanual free exploration per se. The results indicate the importance of haptic exploration at the body midline, where the body can serve as a familiar reference metric for size judgments. Alternative interpretations of the results are discussed, including the impact of movement-based heuristics as a causal factor for the illusion. It was suggested that tracing the curve's peak served to bisect the curve in haptics, because of the change in direction. |
| | |
Authors:
|
Morton A Heller; Anne D McClure Walk; Rita Schnarr; Stephanie Kibble; Brett Litwiller; Cassie Ambuehl |
Related Documents
:
|
12206526 - Achromatic transparency and the role of local contours. 16483406 - A neural model of the scintillating grid illusion: disinhibition and self-inhibition in... 16457166 - New illusions of sliding motion in depth. 16707146 - Dynamics of the influence of segmentation cues on orientation perception. 8266656 - Directional discrimination of motion in depth based on changing target vergence. 21443236 - Molecular order and disorder in the frictional response of alkanethiol self-assembled m... |
Publication Detail:
|
Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
|
Title: Attention, perception & psychophysics Volume: 72 ISSN: 1943-393X ISO Abbreviation: Atten Percept Psychophys Publication Date: 2010 Aug |
Date Detail:
|
Created Date: 2010-08-02 Completed Date: 2010-12-28 Revised Date: 2011-02-24 |
Medline Journal Info:
|
Nlm Unique ID: 101495384 Medline TA: Atten Percept Psychophys Country: United States |
Other Details:
|
Languages: eng Pagination: 1626-41 Citation Subset: IM |
Affiliation:
|
Department, Eastern Illinois University, Physical Sciences Building, Charleston, IL 61920, USA. maheller@eiu.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Discrimination (Psychology) Female Form Perception* Functional Laterality Humans Judgment Male Optical Illusions* Orientation* Psychophysics Sensory Deprivation Size Perception* Stereognosis* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Alignment to visual speech information.
Next Document: Inhibition of vection by red.