Tactile spatial sensitivity and anisotropy

Gibson, Gregory O.; Craig, James C.

doi:10.3758/bf03193632

Cited by 60 publications

(68 citation statements)

References 50 publications

(136 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When comparing threshold values over the frequency range of 8-250 Hz on the fingertip, volar forearm, large toe, and heel, a significant effect of location was found; the fingertip had the lowest average threshold values, followed by the big toe, the heel, and lastly the volar forearm which had the highest thresholds (Morioka et al, 2008). These results follow the same ranking of body part sensitivity as found with two-point gap thresholds (Gibson & Craig, 2005;Stevens & Choo, 1996), and again demonstrates the improved sensing ability of glabrous as compared to hairy skin.…”

Section: Sensitivity To Vibrationsupporting

confidence: 70%

“…Several researchers have found consistent trends that tactile sensitivity increases with distance from the trunk in a proximal to distal direction on the limbs, which is consistent with the density of innervation (Gibson & Craig, 2005;Stevens & Choo, 1996).…”

Section: Variations In Mechanoreceptor Density With Body Locationmentioning

confidence: 53%

“…The sensitivity is higher when the gap edge is oriented perpendicular to the dermal ridges as opposed to parallel (Gibson & Craig, 2005).…”

Section: Variations In Mechanoreceptor Density With Body Locationmentioning

confidence: 92%

“…Values for two-point gap thresholds and relative point localizations for people aged 20 to 25. ' (Stevens & Choo, 1996), (Gibson & Craig, 2005) The data from Gibson and Craig (2005) in Table 1 show a sensitivity anisotropy (directional dependency) along the skin, where for most sites the sensitivity is significantly greater in the mediallateral direction (across the limbs) than in the proximal-distal direction (along the length of the limbs).…”

Section: Variations In Mechanoreceptor Density With Body Locationmentioning

confidence: 99%

“…Two-point thresholds are positively correlated with receptor field size, that is the smaller the receptor field size the smaller the two-point threshold. Grating orientation measures subjects' ability to identify the alignment of a straight edge on the skin (Gibson & Craig, 2005).…”

Section: Variations In Mechanoreceptor Density With Body Locationmentioning

confidence: 99%

See 4 more Smart Citations

Mechanical and Psychophysical Studies of Surface Wave Propagation during Vibrotactile Stimulation

Sofia

Jones

2013

IEEE Trans. Haptics

View full text Add to dashboard Cite

Vibrotactile displays are based on mechanical stimulation delivered using an array of motors to communicate with the user. The way in which the display's motors are spaced and positioned on the body can have a significant impact on the effectiveness of communication, especially for tactile displays used to convey spatial information. The objective of the present research was to determine how the surface waves induced by vibrotactile stimulation of the skin varied as a function of the site on the body where the motors were mounted, and how these waves influenced the ability to localize vibrotactile stimulation. Three locations on the body were selected for study: the palm, the forearm, and the thigh. A flexible printed circuit board containing 3-axis micro-accelerometers was fabricated to measure the amplitude and frequency of surface waves produced by a vibrating motor at each body site. Results of these experiments showed significant differences in the frequency and amplitude of vibration on the glabrous skin on the palm as compared to the hairy skin on the arm and thigh. The palm had the highest frequency and lowest amplitude surface waves, and the forearm and thigh were very similar with lower frequency higher amplitude surface waves. No anisotropies were found from surface wave measurements. Most wave attenuation occurred within the first 8 mm from the motor, but there were still detectable amplitudes at a distance of 24 mm from the motor, which suggests that motor spacing should be at least 24 mm for this type of motor when used for precise spatial localization.A series of psychophysical experiments was conducted using a three-by-three array of motors in which the ability of subjects to localize the point of stimulation in an array was determined at each of the three body locations. The results from these experiments indicated that the palm had the highest localization accuracy (81% correct) as compared to the forearm and thigh which had similar localization accuracies (49% correct on forearm, 45% correct on thigh). Accuracy on the palm and forearm improved when the motor spacing increased from 8 mm to 16 mm, but increased spacing did not improve accuracy on the thigh. The results also showed that subjects were more able to identify the column of activation as opposed to the row of activation, which suggests a higher spatial acuity along the mediallateral as opposed to proximal-distal axis. The localization experiments indicate that glabrous skin is better suited for precise spatial localization than hairy skin, and that precise spatial localization requires an inter-motor spacing of more than 16 mm at these sites.

show abstract

Section: Sensitivity To Vibrationsupporting

confidence: 70%

Section: Variations In Mechanoreceptor Density With Body Locationmentioning

confidence: 53%

“…The sensitivity is higher when the gap edge is oriented perpendicular to the dermal ridges as opposed to parallel (Gibson & Craig, 2005).…”

Section: Variations In Mechanoreceptor Density With Body Locationmentioning

confidence: 92%

Section: Variations In Mechanoreceptor Density With Body Locationmentioning

confidence: 99%

Section: Variations In Mechanoreceptor Density With Body Locationmentioning

confidence: 99%

See 3 more Smart Citations

Mechanical and Psychophysical Studies of Surface Wave Propagation during Vibrotactile Stimulation

Sofia

Jones

2013

IEEE Trans. Haptics

View full text Add to dashboard Cite

show abstract

Teaching human anatomy to the visually impaired: A systematic review

Lima

Silva²,

Guedert

et al. 2022

Clinical Anatomy

View full text Add to dashboard Cite

Information related to human anatomy is present throughout the educational process, especially in undergraduate courses in the biomedical area. These courses have complex theoretical and practical contents, and this becomes more evident when they are developed for the visually impaired. The objective of this work was to perform a systematic review on the teaching of human anatomy for the visually impaired. After the protocol was registered on the PROSPERO platform (CRD42022306002), 10 electronic databases were manually searched with the descriptors “teaching human anatomy” and “visually impaired.” Intervention studies were selected without date or language restrictions. In the end, only eight studies were found. Tactile materials produced manually, and Braille and cadaveric pieces, are assessed as good tools for teaching human anatomy to the visually impaired. There is a pressing need for adaptations of teaching methods to make the teaching more accessible and inclusive.

show abstract