scholarly journals Tactile vibration: Dynamics of psychophysical scaling method, test site, and contactor surface area

1988 ◽  
Vol 26 (5) ◽  
pp. 425-428 ◽  
Author(s):  
Daniel Harris ◽  
Donald Fucci ◽  
Linda Petrosino
Keyword(s):  
Surface Area ◽  
Test Site ◽  
Scaling Method ◽  
Psychophysical Scaling ◽  
Vibration Dynamics

Effects of Psychophysical Scaling Method, Body Test-Site, and Skin-Contactor Surface Area on Vibrotactile Magnitude Functions

1987 ◽  
Vol 64 (3_suppl) ◽  
pp. 1127-1138 ◽  
Author(s):  
Donald Fucci ◽  
Linda Petrosino ◽  
Daniel Harris ◽  
Elise Mc Math
Keyword(s):  
Surface Area ◽  
Test Site ◽  
Thenar Eminence ◽  
Interactive Effects ◽  
Vibrotactile Stimulation ◽  
Scaling Method ◽  
Anterior Midline ◽  
Contactor Area ◽  
Psychophysical Scaling ◽  
Scaling Methods

This study was designed to focus on possible interactive effects that scaling method, body test-site, and skin-contactor surface area might have on vibrotactile magnitude functions. The psychophysical scaling methods of magnitude estimation and magnitude production were used to apply vibrotactile stimulation to the anterior midline of the tongue and the thenar eminence of the hand through the use of three skin-contactor areas (.128, .320, and 1.30 cm3). Ten subjects, ranging in age from 19 to 21 yr. ( M age = 19.8 yr.) were employed. Data obtained from the 10 subjects suggested that the suprathreshold-scaling method chosen can be a significant determinant of the findings obtained. They further suggested that the tongue and hand may respond differently to suprathreshold vibrotactile stimulation and that the effects of varying skin-contactor area may be different for the two body-sites tested.

Magnitude Estimation and Cross-Modal Matching of Lingual Vibrotactile and Auditory Sensation

1989 ◽  
Vol 32 (3) ◽  
pp. 698-702 ◽  
Author(s):  
Daniel Harris ◽  
Donald Fucci ◽  
Linda Petrosino
Keyword(s):  
Auditory Stimulus ◽  
Magnitude Estimation ◽  
Sensory Processing ◽  
Test Site ◽  
Systematic Investigation ◽  
Thenar Eminence ◽  
Stimulus Range ◽  
Psychophysical Scaling ◽  
Scaling Methods ◽  
Response Biases

The present experiment was a preliminary attempt to use the psychophysical scaling methods of magnitude estimation and cross-modal matching to investigate suprathreshold judgments of lingual vibrotactile and auditory sensation magnitudes for 20 normal young adult subjects. A 250-Hz lingual vibrotactile stimulus and a 1000-Hz binaural auditory stimulus were employed. To obtain judgments for nonoral vibrotactile sensory magnitudes, the thenar eminence of the hand was also employed as a test site for 5 additional subjects. Eight stimulus intensities were presented during all experimental tasks. The results showed that the slopes of the log-log vibrotactile magnitude estimation functions decreased at higher stimulus intensity levels for both test sites. Auditory magnitude estimation functions were relatively constant throughout the stimulus range. Cross-modal matching functions for the two stimuli generally agreed with functions predicted from the magnitude estimation data, except when subjects adjusted vibration on the tongue to match auditory stimulus intensities. The results suggested that the methods of magnitude estimation and cross-modal matching may be useful for studying sensory processing in the speech production system. However, systematic investigation of response biases associated with vibrotactile-auditory psychophysical scaling tasks appears to be a prerequisite.

Temporal Integration of Vibrotactile Stimulation

1967 ◽  
Vol 25 (2) ◽  
pp. 549-560 ◽  
Author(s):  
Birgitta Berglund ◽  
Ulf Berglund ◽  
Goesta Ekman
Keyword(s):  
Power Function ◽  
Stimulus Duration ◽  
Temporal Integration ◽  
Logarithmic Function ◽  
Vibrotactile Stimulation ◽  
Scaling Method ◽  
Perceived Intensity ◽  
Psychophysical Scaling

The perceived intensity of vibrotactile stimulation at 250 c/s was measured by a psychophysical scaling method under different conditions of intensity (32–54 db) and duration (30–1200 msec.) of stimulation. It was found (1) that perceived intensity grows as a logarithmic function of stimulus duration up to about 1 sec., whereafter it remains constant, and (2) that the exponent of the psychophysical power function decreases from 0.7 at the shortest duration and approaches a constant value of about 0.4 for the longest durations.

scholarly journals Psychophysical scaling method for measurement of colors concept in children and adults

2021 ◽  
pp. 100077
Author(s):  
Marcelo Fernandes Costa ◽  
Carlo Martins Gaddi ◽  
Vitor Melo Gonsalez ◽  
Fraulein Vidigal de Paula
Keyword(s):  
Scaling Method ◽  
Psychophysical Scaling

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Cell morphology, volume, and surface area determinations from multilevel contouring within HVEM micrographs of serial sections and whole-cell mounts

1987 ◽  
Vol 45 ◽  
pp. 588-589
Author(s):  
M. Marko ◽  
A. Leith ◽  
D. Parsons
Keyword(s):  
Surface Area ◽  
Electron Micrographs ◽  
Cell Morphology ◽  
Individual Variation ◽  
Serial Section ◽  
Stereo Pair ◽  
Complex Structures ◽  
Serial Sections ◽  
Surface Areas ◽  
Computer Based

The use of serial sections and computer-based 3-D reconstruction techniques affords an opportunity not only to visualize the shape and distribution of the structures being studied, but also to determine their volumes and surface areas. Up until now, this has been done using serial ultrathin sections.The serial-section approach differs from the stereo logical methods of Weibel in that it is based on the Information from a set of single, complete cells (or organelles) rather than on a random 2-dimensional sampling of a population of cells. Because of this, it can more easily provide absolute values of volume and surface area, especially for highly-complex structures. It also allows study of individual variation among the cells, and study of structures which occur only infrequently.We have developed a system for 3-D reconstruction of objects from stereo-pair electron micrographs of thick specimens.

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