Use of the psychophysical method of adjustment in tonal pattern discrimination

1993 ◽  
Vol 93 (4) ◽  
pp. 2315-2315
Author(s):  
Charles S. Watson ◽  
Gary R. Kidd ◽  
Aimée M. Surprenant ◽  
Ward R. Drennan
Keyword(s):  
Pattern Discrimination ◽  
Psychophysical Method ◽  
Tonal Pattern ◽  
Method Of Adjustment

Diplacusis Associated with Bilateral High Frequency Hearing Loss

1975 ◽  
Vol 18 (1) ◽  
pp. 5-16 ◽  
Author(s):  
Dale O. Robinson ◽  
John H. Gaeth
Keyword(s):  
Hearing Loss ◽  
Hard Of Hearing ◽  
High Frequency ◽  
Traditional Method ◽  
Constant Error ◽  
Normal Hearing ◽  
Psychophysical Method ◽  
High Frequency Hearing Loss ◽  
Standard Tone ◽  
Method Of Adjustment

Seven normal-hearing subjects and seven subjects with mild bilateral high-frequency sensorineural hearing losses were studied to explore the presence of diplacusis. A tracking procedure of psychophysical method of adjustment-limits was used for pitch judgments rather than the traditional method of adjustment. Each subject was presented with a standard 4000-Hz tone for 500 msec and alternately a variable tone for 500 msec. Subjects were instructed to adjust the variable tone upward or downward in pitch to bracket the pitch sensation of the standard tone. Two intra-aural and two interaural listening conditions were studied. A graphic representation of the subjects' adjustments of the variable tone was obtained for each condition. The resulting tracing indicated frequency correlates to the pitch adjustments from which excursion width and constant error were calculated. Some hard-of-hearing subjects and one normal-hearing subject were found to have diplacusis. Subjects with hearing losses exhibited larger excursion widths for intra- and interaural listening conditions. Subjects with hearing losses tended to be less consistent in pitch judgments than normal-hearing subjects. These findings were interpreted to mean that bilaterally symmetrical hearing losses increase the incidence of pitch aberrations.

Color difference formulae evaluation by method of adjustment

2014 ◽  
Vol 11 (1) ◽  
pp. 89-94 ◽  
Author(s):  
A. Abbasi ◽  
M. Vik ◽  
M. Vikova
Keyword(s):  
Color Difference ◽  
Psychophysical Method ◽  
Psychophysical Experiment ◽  
Statistical Measures ◽  
Color Differences ◽  
The Mean ◽  
Different Color ◽  
Method Of Adjustment ◽  
Visual Results ◽  
Test Color

This experiment was carried out to test color difference formulae by method of adjustment. 6 different color centers (Red, Yellow, Green, Blue-Green, Blue and Violet) were chosen for this psychophysical experiment. 336 virtual sample pairs were prepared. The mean color difference was three CIELAB units. Each pair was assessed by a panel of 15 observers using psychophysical methods called Method of Adjustment. These visual data were used to test color-difference formulae: CIELAB, CMC, CIE94, DIN99d and CIE2000 with the help of simple statistical measures i.e., PF/3 and Stress. It was found that the visual results obtained from psychophysical method of adjustment show that CIE94 as well as DIN99d still perform well for small color differences.

A Psychophysical Measure of Visual and Kinaesthetic Spatial Discriminative Abilities of Adults and Children

Perception ◽  
1986 ◽  
Vol 15 (3) ◽  
pp. 313-324 ◽  
Author(s):  
Victor J Manyam
Keyword(s):  
Age Groups ◽  
Psychophysical Method ◽  
Visual Responses ◽  
Variable Stimulus ◽  
Experimental Conditions ◽  
Adult Performance ◽  
Quantitative Estimates ◽  
Adults And Children ◽  
Simultaneous Comparisons ◽  
Method Of Adjustment

Quantitative estimates of the spatial discriminative capacities of the visual and kinaesthetic systems in adults and children were obtained. Intersensory integration was investigated by including spatial discriminations based on congruent visual plus kinaesthetic reafference. The psychophysical method of adjustment was used with simultaneous comparisons of a fixed and a variable stimulus. The subject's task was to estimate when the variable stimulus (ellipse) was identical to the standard one (circle), under one of three modality conditions: vision, kinaesthesis, and vision plus kinaesthesis. After a pilot study with adults, children (aged 8, 10, and 12 years) and adults were both tested. Subjects from each age group were randomly allocated to each of the three experimental conditions. Results show that the visual and kinaesthetic estimates of the 8- and 10-year-old subjects did not differ significantly, but the visual responses of the adults and 12 year olds were significantly more accurate than corresponding kinaesthetic estimates. Bisensory estimates were significantly more accurate than visual responses only for the 8- and 10-year-old age groups. Intramodal comparisons showed the kinaesthetic estimates of the 8, 10, and 12 year olds to be significantly more accurate than the corresponding adult performance. Adult visual estimates were significantly more accurate than those made by 8 year olds, but were not significantly different from the visual responses of 10 and 12 year olds. Estimates based on bisensory reafference did not differ from each other across the four age groups. It is concluded that modality adeptness and dominance are task dependent and empirically determined rather than being innate properties of sensory systems. The data indicate that intersensory differentiation rather than integration occurs with maturity.

Vibrotactile Stimulation: An Investigation of Psychophysical Methods for Establishing Threshold

1972 ◽  
Vol 34 (3) ◽  
pp. 891-898 ◽  
Author(s):  
Donald Elliott Hall ◽  
Donald J. Fucci ◽  
Dennis J. Arnst
Keyword(s):  
Psychophysical Method ◽  
Vibrotactile Stimulation ◽  
Vibrotactile Thresholds ◽  
Anterior Midline ◽  
Significant Difference ◽  
Method Of Adjustment

This investigation was designed to adopt and evaluate the psychophysical method of limits and method of adjustment using ascending and descending stimuli series to obtain oral vibrotactile thresholds on the anterior midline surface of the tongue. A significant difference in vibrotactile thresholds was not found with either the method of limits or the method of adjustment. The differences between ascending and descending thresholds were also not significant.

The Effect of Psychophysical Method on the Loudness of Continuous and Interrupted Pure Tones

1979 ◽  
Vol 22 (4) ◽  
pp. 717-730
Author(s):  
Dennis Hampton ◽  
Ira M. Ventry
Keyword(s):  
Psychophysical Method ◽  
Experimental Conditions ◽  
Mean Values ◽  
Tracking Method ◽  
Tracking Tasks ◽  
Loudness Judgment ◽  
Pure Tones ◽  
Comfortable Loudness ◽  
Method Of Adjustment ◽  
Method Of Constant Stimuli

Using the Bekesy tracking method for loudness judgment tasks such as most comfortable loudness (MCL) and recalled loudness (RL) measurements, normal listeners have tracked continuous (C) tones at lesser intensities than interrupted (I) tones. The resulting continuous/interrupted (C/I) separations have ranged up to 22 dB. Explanations of the unexpected C/I separations have not been in agreement. The purpose of this study was to investigate whether psychophysical method has a significant effect on the C/I separation. Subjects were six normal-hearing adults, each of whom participated in three practice and ten test sessions of one hour each. Thirty-six experimental conditions were presented. The test signals were C tones, 200/200 msec I tones and 200/800 msec I tones, all at 1 kHz. The reference intensities were 20, 50 and 80 dB SPL. The four methods were Bekesy tracking method (BTM), method of adjustment (MAdj), method of limits (ML) and method of constant stimuli difference (MCSD). Mean values for Point of Subjective Equality and C/I separation were calculated. C/I separations obtained with the BTM were significantly larger than C/I separations obtained with any other psychophysical method. These results demonstrate that C/I separations obtained during suprathreshold Bekesy tracking tasks by normal hearers are largely caused by the measurement method itself rather than by differences in C and I tone loudness. Time order errors could explain the BTM effect.

Tonal Cognition in Pattern Discrimination: Evidence from Three Populations

2000 ◽  
Vol 48 (2) ◽  
pp. 162-177 ◽  
Author(s):  
John M. Holahan ◽  
T. Clark Saunders ◽  
Michael D. Goldberg
Keyword(s):  
Musical Training ◽  
Item Type ◽  
Age Groups ◽  
Pattern Discrimination ◽  
First Grade ◽  
Grade Group ◽  
Tonal Pattern ◽  
College Age ◽  
Functional Mechanisms ◽  
Item Types

The development of tonal pattern discrimination was investigated in 24 college musicians, 24 college nonmusicians, and 38 children in first grade. Comparisons of the two college-age groups on three tests yielded differences in accuracy and speed that interacted with item type. Comparisons of all three groups on one test demonstrated that college nonmusicians were no more accurate, although they responded to some item types faster than did the first-grade group. These data support the process validity of the approach developed by Saunders and Holahan (1993) to the study of functional mechanisms of tonal audiation across the developmental span from the majority of children in first grade to college-age students with different levels of musical training.

Race Difference in Auditory Sensitivity

1964 ◽  
Vol 7 (4) ◽  
pp. 389-393 ◽  
Author(s):  
David C. Shepherd ◽  
Robert Goldstein ◽  
Benjamin Rosenblüt
Keyword(s):  
White Women ◽  
White Men ◽  
Sensitivity Study ◽  
Auditory Sensitivity ◽  
Race Difference ◽  
Men And Women ◽  
Auditory Thresholds ◽  
Békésy Audiometry ◽  
Method Of Adjustment ◽  
Better Than

Two separate studies investigated race and sex differences in normal auditory sensitivity. Study I measured thresholds at 500, 1000, and 2000 cps of 23 white men, 26 white women, 21 negro men, and 24 negro women using the method of limits. In Study II thresholds of 10 white men, 10 white women, 10 negro men, and 10 negro women were measured at 1000 cps using four different stimulus conditions and the method of adjustment by means of Bekesy audiometry. Results indicated that the white men and women in Study I heard significantly better than their negro counterparts at 1000 and 2000 cps. There were no significant differences between the average thresholds measured at 1000 cps of the white and negro men in Study II. White women produced better auditory thresholds with three stimulus conditions and significantly more sensitive thresholds with the slow pulsed stimulus than did the negro women in Study II.

Spatial Pattern Discrimination in Rats

2003 ◽  
Author(s):  
Kelly A. Digian ◽  
Michael Brown
Keyword(s):  
Spatial Pattern ◽  
Pattern Discrimination
Sign in / Sign up

Export Citation Format

Share Document