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Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
THE EFFECTS OF SKIN COMPRESSIBILITY UPON PSYCHOPHYSICAL FUNCTIONS OF TACTILE INTENSITY: A COMPARISON OF FORCE AND DEPTH OF SKIN INDENTATION AS STIMULUS DIMENSIONS
Description:
Different areas of skin were shown to have different degrees of compressibility. One skin site was considered more compressible than another if it showed a larger range of indentations resulting from a set range of forces. Two skin sites... The experimental question asked was how does skin compressibility affect psychophysical functions, while two consistently produced negatively accelerating functions describing tactile sensory intensity? A number of separate... Out of four subjects tested, two consistently produced positively accelerating psychophysical functions, while two consistently produced negatively accelerating functions. It was predicted that if psychophysical functions based on force... It was also predicted that if psychophysical functions based on skin indentation were affected by skin compressibility, a more compressible skin site would provide for a smaller exponent. This prediction was observed in eleven out of... It was apparent that skin compressibility does play a role in determining how intense a given mechanical stimulus feels. It was hypothesized that, regardless of the stimulus dimension, the difference in skin compressibility may cause a... An examination of the variability of the magnitude estimates indicated two things. (1) A power function model of the stimulus intensity - tactile sensory intensity relationship is better than a straight linear model. (2) A given skin...
An investigation of the role of tuning in the organization of voluntary movements
Description:
This study was undertaken to determine the role of feedforward tuning in the organization of a voluntary movement. Right-handed male college students (N = 12) volunteered to participate in the study. A finger flexion/extension choice... It was predicted that the one limb/two choice condition would prohibit pre response biasing of the agonist/antagonist relationship of the response finger because the agonist/antagonist relationship of the muscles involved could not be... A 3 x 3 x 2 x 3 x 4 ANOVA was conducted on the data collected in a complete within-subjects design. The factors were: (a) blocks, (b) movement combinations, (c) movement directions, (d) phases, and (e) fingers. The analysis revealed a... This analysis revealed one significant main effect for phases which was indicative of an increased state of readiness during the anticipation phase. In addition, a significant direction x phases interaction indicated a biasing of the... A separate 3 x 3 ANOVA was conducted on the reaction time data. The factors in this analysis were: (a) movement combinations, and (b) trial blocks. The analysis revealed a movement combinations main effect.
Electrophysiologic responses to word/non-word CVC stimuli
Description:
The auditory P3 response is thought to be related to stimulus evaluation time. It is typically elicited using an "oddball tonal paradigm" in which "rare" acoustic events (tones) are embedded in a stream of "frequent" tonal signals. The... The purpose of this study was to determine if differences exist in the P3 response (latency and amplitude) elicited by tonal and speech signals during competing and non-competing stimulus conditions. P3 responses were obtained from 61... The addition of competing noise resulted in decreases in certain wavepeak amplitudes and increases in P3 latencies. The choice of stimulus (tones versus words) had no effect on wavepeak amplitude. However, P3 latencies were significantly...
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