Sensory perception threshold measurement: an evaluation of semiobjective testing devices

Area of Science:

• Neuroscience
• Sensory Physiology

Background:

• Establishing normative sensory perception thresholds is crucial for diagnosing neurological conditions.
• Variability in sensory thresholds can be influenced by factors like age, location, and nerve distribution.

Purpose of the Study:

• To determine normal sensory perception threshold values in healthy adults.
• To assess intersubject variability and the correlation of thresholds with age.
• To compare sensory thresholds across different body sites and nerve distributions.

Main Methods:

• Utilized five semiobjective devices: Semmes-Weinstein monofilament, three-point esthesiometer, Pfizer thermal tester, biothesiometer, and Optacon tactile tester.
• Tested 36 normal subjects at 12 upper extremity (UE) and 10 lower extremity (LE) sites using a two-alternative forced choice method.
• Evaluated touch, temperature, two-point discrimination, and vibration sensory modalities.

Main Results:

• Mean sensory thresholds were significantly lower in UE sites compared to LE sites.
• Distal sites showed lower thresholds for two-point discrimination and vibration in the UE, and higher for touch in the LE.
• Most sensory modalities correlated with age, with no significant differences between sexes.

Conclusions:

• Normative sensory perception threshold data were established for various body sites and modalities.
• Age and location significantly influence sensory perception thresholds.
• Findings provide a baseline for clinical assessment of sensory deficits.