File:Model of predicted SI cortical activity in response to specific conditions of tactile stimulation.JPEG
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DescriptionModel of predicted SI cortical activity in response to specific conditions of tactile stimulation.JPEG | Figure legend in source article (CC-by-2.0): "Model of predicted SI cortical activity in response to specific conditions of tactile stimulation. This model is an extension of the Vierck and Jones model (1970) on two-point receptive fields. a. When stimuli consisting of two points are oscillated on the skin at low-frequency 25 Hz flutter at distant sites, the peaks of SI response are distinct and non-overlapping, and therefore the subject is easily able to discriminate between the two points. b. As the points are positioned at stimulus sites that are closer together, the peaks begin to overlap. Because the peaks are no longer easily distinguishable, discriminability is reduced. c. Adding a same-site high-frequency 200 Hz vibration to the flutter stimuli ("complex" stimuli) has been shown to reduce the spatial extent of the peaks of response in SI and, as found in the present study, would make it easier to distinguish between two points on the skin. d. Presentation of a stimulus at the same skin site on the unattended hand would reduce the magnitude of SI response by flutter stimulation. This reduction in magnitude of SI response would consequently lead to a reduction in the clarity (or contrast) between the activity evoked by the adjacent, or near-adjacent, cortical regions activated by the two stimuli, and as a result, lead to a decrease in spatial acuity." |
Date | Published on 2005-10-10, prepared for and uploaded to Commons on 2007-12-21. |
Source | Tannan, V; RG Dennis, M Tommerdahl (2005). "Stimulus-dependent effects on tactile spatial acuity". Behavioral and Brain Functions 1 (1): 18. DOI:10.1186/1744-9081-1-18. ISSN 1744-9081. Retrieved on 2007-12-21. |
Author | Article by V Tannan, RG Dennis, M Tommerdahl. |
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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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current | 19:46, 21 December 2007 | 612 × 988 (233 KB) | OldakQuill (talk | contribs) | {{Information |Description=Figure legend in source article (CC-by-2.0): "Model of predicted SI cortical activity in response to specific conditions of tactile stimulation. This model is an extension of the Vierck and Jones model (1970) on two-point recept |
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Software used | Adobe Photoshop CS2 Windows |
File change date and time | 13:38, 27 September 2005 |
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