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- Tone_variator abstract "German psychologist William Stern invented the tone variator in 1897 to study human sensitivity to changes in pitch, going beyond the traditional psychophysical research of studying the sensitivity to differences in discrete tones. The instrument consists of an adjustable brass resonator, which is supplied with a constant flow of air across the opening at the top. Turning a graduated cam on the front of the apparatus raises or lowers a piston in the bottom of the resonator, changing the volume of its interior, thus altering the sounded pitch over a continuous range.The spiral-shaped cam is such that equal angles of rotation approximately correspond to equal changes in frequency. A dial on the front of the cam indicates the current resonance frequency and musical tone of the instrument.Subsequent improvements to the device include the addition by G. M. Whipple of a gasometer, in order to regulate the incoming air supply. A version of the device was also produced in which the bottom of the resonator was not displaced by a spiral, but by rack and pinion (see figure); in these, an eccentrically-operated pointer is used to indicate the frequency on the scale.The instrument has been used in demonstrations, for tuning other instruments, and for research in psychology and otology. According to Stern, his research in the "apperception of change" began a "decisive metamorphosis" in his understanding:Template:"".
- Tone_variator thumbnail Tone_variator.jpg?width=300.
- Tone_variator wikiPageExternalLink p49_1.
- Tone_variator wikiPageExternalLink whipple03.htm.
- Tone_variator wikiPageExternalLink index.html.
- Tone_variator wikiPageExternalLink Tone_variator.html.
- Tone_variator wikiPageExternalLink sternv.htm.
- Tone_variator wikiPageExternalLink results.asp?image=10324862&wwwflag=2&imagepos=3.
- Tone_variator wikiPageExternalLink 51634.
- Tone_variator wikiPageID "5790286".
- Tone_variator wikiPageRevisionID "320578638".
- Tone_variator hasPhotoCollection Tone_variator.
- Tone_variator sign "— Stern, W. . Autobiographical Essay in A History of Psychology in Autobiography, Murchinson, Carl Vol. 1. Worchester Mass: Clarke University Press.".
- Tone_variator text "The issue [apperception of change] was raised by a psycho-physical proposition: I wanted to discover the 'sensitivity,' not as Fechner and his successors, for two barely distinguishable constant stimuli, but for the continuous change of one stimulus into another. At first I conceived the problem in purely sensationist terms, sought to determine thresholds experimentally, raised the question of the possible existence of 'transition feelings,' etc. Soon, however, the sphere of my inquiry widened in the direction of descriptive and humanistic problems.".
- Tone_variator subject Category:Hearing.
- Tone_variator subject Category:Perception.
- Tone_variator subject Category:Psychology_experiments.
- Tone_variator type Abstraction100002137.
- Tone_variator type Act100030358.
- Tone_variator type Activity100407535.
- Tone_variator type Event100029378.
- Tone_variator type Experiment100639556.
- Tone_variator type Investigation100633864.
- Tone_variator type PsychologicalFeature100023100.
- Tone_variator type PsychologyExperiments.
- Tone_variator type Research100636921.
- Tone_variator type ScientificResearch100641820.
- Tone_variator type Work100575741.
- Tone_variator type YagoPermanentlyLocatedEntity.
- Tone_variator comment "German psychologist William Stern invented the tone variator in 1897 to study human sensitivity to changes in pitch, going beyond the traditional psychophysical research of studying the sensitivity to differences in discrete tones. The instrument consists of an adjustable brass resonator, which is supplied with a constant flow of air across the opening at the top.".
- Tone_variator label "Tone variator".
- Tone_variator sameAs m.0f4pxk.
- Tone_variator sameAs Q7820865.
- Tone_variator sameAs Q7820865.
- Tone_variator sameAs Tone_variator.
- Tone_variator wasDerivedFrom Tone_variator?oldid=320578638.
- Tone_variator depiction Tone_variator.jpg.
- Tone_variator isPrimaryTopicOf Tone_variator.
