Perception of lung volume and Weber's law

Gliner, Jeffrey A.; Folinsbee, Lawrence J.; Horvath, Steven M.

doi:10.1152/jappl.1982.52.6.1679

Cited by 2 publications

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“…It seems likely that the discrepancies between the findings from the two studies derived from the different psychophysical methods employed and did not originate in different mathematical treatment of the data. This view is supported by the fact that the JNDs obtained by Gliner, Folinsbee & Horvath (1982) by the 'Modified Method of Limits' were 1.4 to 1.7 times higher than those obtained by the Method of Average Error.…”

Section: Stimulation These Three Breaths Varied In 'Visualmentioning

confidence: 89%

“…This is in harmony with the finding of Wolkove et al (1981) that the variability of the errors obtained in attempts to double a reference volume increased progressively with the reference volume. Also in their studies on matching inspired lung volume both Gliner et al (1981Gliner et al ( , 1982 and Wolkove et al (1982) found that precision in reproducing lung volumes was dependent on the reference level. However, the Weber fractions, i.e.…”

Section: The Dependence Of Jnd On the Reference Volumementioning

confidence: 99%

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The ability of human subjects to detect small changes in breathing volume

Katz‐Salamon¹

1984

Acta Physiologica Scandinavica

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Human ability to detect small changes in the inspired volume was tested in four healthy subjects. The tested volume changes were achieved by: 1) displaying breathing volume continuously to the subject on the screen of an oscilloscope, the vertical gain of which was changed by the experimenter, and 2) breathing small amounts of CO2 (0.02-2.0%) in air. The subject was asked to signal, by pressing a button, every time two consecutive breaths differed from the reference level. The six tested volume changes corresponded to 15-65% of the reference, when changes in eupneic tidal volume were tested, and to 15-45% when changes in three reference volume levels, 1.0, 1.5, and 2.0 times the resting tidal volume, were tested. The just noticeable difference (JND) was defined as the volume change detected in 50% of the trials. The obtained results showed that the JND for volume corresponds to a volume change of 120-160 ml (23-28% of the reference) when the resting tidal volume was used as the reference. For the three reference volumes, the JND was found to be a nearly constant fraction (0.25-0.29) of the reference volume and thus followed the 'classical' Weber law (JND/reference stimulus = constant).

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Section: Stimulation These Three Breaths Varied In 'Visualmentioning

confidence: 89%

Section: The Dependence Of Jnd On the Reference Volumementioning

confidence: 99%