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Updated: Jun 1, 2026

A Two-interval Forced-choice Task for Multisensory Comparisons

A Two-interval Forced-choice Task for Multisensory Comparisons

Published on: November 9, 2018

Psychometric functions for efficient and effective psychophysical testing of sensory function.

J P M Vriens¹, S A Strijbos, H W van der Glas

¹Department of Oral-Maxillofacial Surgery, Prosthodontics and Special Dental Care, University Medical Center Utrecht, Utrecht, The Netherlands.

International Journal of Oral and Maxillofacial Surgery

|May 24, 2011

Summary

This study developed an efficient sensory function test using real and sham stimuli. The test quickly identifies abnormal sensory function by pinpointing stimulus magnitudes exceeding critical percentiles in healthy subjects.

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Area of Science:

Neuroscience
Sensory Physiology
Clinical Assessment

Background:

Assessing sensory function is crucial for diagnosing neurological disorders.
Current methods can be time-consuming and subjective.
A need exists for efficient and objective sensory testing.

Purpose of the Study:

To determine psychometric functions for sensory tests using real and sham stimuli.
To establish critical stimulus magnitudes for identifying abnormal sensory function.
To evaluate the efficacy of these tests for different sensory modalities and body sites.

Main Methods:

Utilized a real/sham stimulation paradigm with healthy subjects (n=150 for light touch, n=100 for two-point discrimination, n=50 for cold sensation).
Determined psychometric functions for tongue and six facial sites across light touch, cold sensation, and two-point discrimination.
Employed a staircase-limits procedure to vary stimulus magnitude and Boltzmann function fitting to derive percentiles (90th, 95th, 99th).

Main Results:

Established psychometric functions for various sensory modalities and anatomical locations.
Identified critical stimulus magnitudes corresponding to high percentiles of normal sensory performance.
Demonstrated that a combination of tests for large and small nerve fibers can rapidly assess sensory deficits.

Conclusions:

The developed real/sham stimulus test provides an efficient method for assessing sensory function.
This approach allows for rapid identification of abnormal sensory function, including specific nerve fiber pathology.
The findings support the clinical utility of this novel sensory testing paradigm.