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Results for “Differential Threshold”

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At least 19 recordsLinked to original sources
PubMed1992

Differential thresholds for limb movement measured using adaptive techniques.

Differential thresholds for limb movement were measured in 10 subjects, using the transformed up-down procedure. Subjects were required to indicate which of two random displacement perturbations delivered to their forearms had the larger standard deviation (SD). The SD of the reference signal was fixed for each experimental condition at one of seven values ranging from 0.05 to 3.2 mm. THe SD of the other signal varied depending on the subject's response. Using this procedure, the differential threshold for limb movement was calculated to be 8%, which is very similar to the thresholds estimated previously for changes in limb position (9%) and force (7%). The sensitivity of the human proprioceptive system to changes in limb displacement was much greater than anticipated, with subjects being able to resolve a 5-microns difference between two perturbations delivered to their arms.

Adult↗
PubMed1978

[New methods in the objective audiometry for the proof of simulation and for the determination of the differential thresholds for frequency and intensity (author's transl)].

The "late acoustically evoked potentials" (50 to 300 msec) can be recorded in different stages of vigilance and awareness; therefore their significance as a correlate of conscious central perception is doubtful. The "very late DC-potentials" (300 msec and more) reflect conscious central perception because of their cognitively determinated features and can be used for the proof of simulation. Their application in ERA comprises the determination of the hearing threshold, the "objective speech audiometry" and the determination of the differential thresholds. The "objective frequency decrement test" gives additional informations about the degree and the specifity of a hearing loss. The objective proof of the differential threshold for intensity demonstrates the insufficient significance of the SISI test.

Audiometry↗
PubMed1985

The measurement of differential thresholds for lifted weights by microcomputer-controlled apparatus.

The measurement of differential thresholds (DLs) for lifted weights normally involves lengthy test sessions. This is due partly to the statistical techniques for measuring the threshold and partly to the methods adopted to present the stimuli. Attempts to speed up test procedures tend to produce unreliable DL estimates, or to measure the sense of force or effort rather than weight perception. To facilitate the measurement of DLs for lifted weights, an Apple microcomputer was programmed to generate Wetherill tracking procedures and was interfaced with two stimulus bearing turntables. Various lifting methods are easily implemented, and DLs are reliably and quickly measured. The adaptation of the apparatus for general use in investigating the haptic sense modality is discussed.

Computers↗
PubMed1983

Effect of acetazolamide on the differential threshold.

Following the oral administration of three 250-mg doses of acetazolamide sodium to nine patients with glaucomatous visual-field defects, a statistically significant improvement in the differential threshold was observed, whereas in 16 glaucoma suspects, no change could be detected. The greatest improvements following acetazolamide administration occurred in younger patients and in those with the greatest disturbances of the visual field.

Acetazolamide↗
PubMed1990

[The differential threshold of thickness perception between antagonist teeth with different degrees of mouth opening].

The discriminatory capacity of various widths, at different degrees of mouth opening, was assessed in a population of 22 individuals, 13 females and 9 males, with complete dentition. Seven series of nine widths each, based on central standardised measurements, and the choice of appropriate intervals enabled an univocal experimental method to be elaborated. The results showed that the differential threshold follows Weber's Law in a relatively linear fashion and that the perception interval varies in proportion from a tenth of a millimetre to 2 mm. In addition, whereas no specificity of direction was found for smaller widths, this was evident for larger widths but was contrary to that reported in earlier studies on the subject.

Adolescent↗