Tactile Spatial Acuity
Tactile Spatial Acuity - Related Videos
07:32
Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
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Cited by 9 •
2016
Here, we present protocols to determine vibration detection thresholds and tactile acuity using psychophysical methods in man.
06:00
Assessment of Spatial Lingual Tactile Sensitivity using a Gratings Orientation Test
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Cited by 2 •
2021
This work illustrates a standard procedure and threshold determination by the R-index to assess spatial lingual tactile sensitivity using a gratings orientation test.
04:02
Optokinetic Response Assay: A Method to Measure Visual Acuity in Zebrafish
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2023
This video describes the optokinetic response assay in zebrafish. The video measures the reflexive eye movements based on the visual moving stimulus and determines the visual acuity in zebrafish.
19:44
A Tactile Automated Passive-Finger Stimulator (TAPS)
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Cited by 24 •
2009
We describe a computer-controlled device for investigating the sense of touch: the Tactile Automated Passive-finger Stimulator (TAPS). We describe the components of TAPS, and show how TAPS is used to administer a two-interval forced-choice tactile grating orientation test.
08:05
Testing Tactile Masking between the Forearms
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Cited by 2 •
2016
Here we explore contralateral tactile masking between the forearms in which tactile detection thresholds are modulated by vibration applied to a remote site. The details of which remote sites have an effect can tell us about how the body is represented in the brain.
FAQs
Smaller receptive fields allow nearby skin locations to activate more distinct sensory channels, while higher receptor density provides more spatial information from the same surface area. Together, these features improve the nervous system’s ability to compare where touches occur. Differences in these properties help explain why some body regions support finer tactile judgments than others.
Signals from the skin are not interpreted solely at the receptor level. Neural processing in the spinal cord and brain organizes incoming activity so that differences in stimulus location can be evaluated. This processing contributes to the final perceptual judgment and makes tactile spatial acuity relevant to the study of somatosensory organization.
When two skin stimuli are close together, their signals may be difficult to distinguish as separate locations. Increasing the distance between them makes separation more likely. Two-point discrimination uses this relationship to identify the smallest spacing at which a person reports two touches rather than one, providing a behavioral measure of spatial resolution.
Fingertips and lips typically contain more densely distributed sensory receptors and smaller receptive fields than regions with coarser spatial resolution. These biological differences allow the nervous system to extract more precise positional information from touch. Comparing such regions helps researchers examine how peripheral organization relates to sensory performance across the body.
A researcher applies either one or two touches to a selected skin area and varies the distance between the contact points. The participant reports whether the sensation is perceived as one touch or two. The smallest separation consistently judged as two points is used to characterize tactile spatial acuity for that location.
Measurements can support investigations of sensory organization, neural plasticity, and changes associated with injury or disease. Comparing performance across body regions or conditions may show how somatosensory function differs or changes over time. The results therefore connect a simple perceptual task with questions about nervous-system structure, processing, and adaptation.