scholarly journals The effect of neural density and contactor surround on vibrotactile sensation magnitude

1972 ◽  
Vol 11 (1) ◽  
pp. 117-120 ◽  
Author(s):  
Ronald T. Verrillo ◽  
Steven C. Chamberlain
Keyword(s):  
Sensation Magnitude

scholarly journals Mach Band Type Lateral Inhibition in Different Sense Organs

1967 ◽  
Vol 50 (3) ◽  
pp. 519-532 ◽  
Author(s):  
Georg von Békésy
Keyword(s):  
Lateral Inhibition ◽  
Geometrical Model ◽  
Sense Organs ◽  
Sensation Magnitude ◽  
Visual Phenomenon ◽  
Mach Bands ◽  
Band Type ◽  
Mach Band

Experiments were done on the skin with shearing forces, vibrations, and heat stimuli and on the tongue with taste stimuli to show that the well known Mach bands are not exclusively a visual phenomenon. On the contrary, it is not difficult to produce areas of a decreased sensation magnitude corresponding to the dark Mach bands in vision. It is shown on a geometrical model of nervous interaction that the appearance of Mach bands for certain patterns of stimulus distribution is correlated with nervous inhibition surrounding the area of sensation. This corroborates the earlier finding that surrounding every area transmitting sensation there is an area simultaneously transmitting inhibition.

scholarly journals The frequency of cortical microstimulation shapes artificial touch

2019 ◽  
Vol 117 (2) ◽  
pp. 1191-1200 ◽  
Author(s):  
Thierri Callier ◽  
Nathan W. Brantly ◽  
Attilio Caravelli ◽  
Sliman J. Bensmaia
Keyword(s):  
Neural Coding ◽  
Sensory Quality ◽  
Narrow Range ◽  
Low Frequencies ◽  
Pulse Trains ◽  
Sensation Magnitude ◽  
Frequency Judgments ◽  
Wide Range ◽  
Tactile Sensations

Intracortical microstimulation (ICMS) of the somatosensory cortex evokes vivid tactile sensations and can be used to convey sensory feedback from brain-controlled bionic hands. Changes in ICMS frequency lead to changes in the resulting sensation, but the discriminability of frequency has only been investigated over a narrow range of low frequencies. Furthermore, the sensory correlates of changes in ICMS frequency remain poorly understood. Specifically, it remains to be elucidated whether changes in frequency only modulate sensation magnitude—as do changes in amplitude—or whether they also modulate the quality of the sensation. To fill these gaps, we trained monkeys to discriminate the frequency of ICMS pulse trains over a wide range of frequencies (from 10 to 400 Hz). ICMS amplitude also varied across stimuli to dissociate sensation magnitude from ICMS frequency and ensure that animals could not make frequency judgments based on magnitude. We found that animals could consistently discriminate ICMS frequency up to ∼200 Hz but that the sensory correlates of frequency were highly electrode dependent: On some electrodes, changes in frequency were perceptually distinguishable from changes in amplitude—seemingly giving rise to a change in sensory quality; on others, they were not. We discuss the implications of our findings for neural coding and for brain-controlled bionic hands.

scholarly journals Effect of stimulus duration on vibrotactile sensation magnitude

1976 ◽  
Vol 8 (2) ◽  
pp. 112-114 ◽  
Author(s):  
Ronald T. Verrillo ◽  
Robert L. Smith
Keyword(s):  
Stimulus Duration ◽  
Sensation Magnitude

Olfactory analogue to directional hearing

1964 ◽  
Vol 19 (3) ◽  
pp. 369-373 ◽  
Author(s):  
Georg von Békésy
Keyword(s):  
Time Difference ◽  
Directional Hearing ◽  
Sound Waves ◽  
Time Pattern ◽  
Sensation Magnitude ◽  
Olfactory Sensation ◽  
A Value ◽  
Stimulus Combination ◽  
Olfactory Stimuli ◽  
The Difference

The direction of a sound source can be determined binaurally by using the time difference and the loudness difference of the sound waves arriving at the two ears. Similarly, the direction of an olfactory source can be determined by using the time difference and the difference in sensation magnitude of the olfactory stimuli between the two nostrils as the air surrounding the odorous object is inhaled. Time differences of the order of 0.1 msec can be recognized—a value similar to that found in hearing. Thus the direction of an odor can be determined with a precision of 7–10° in spite of the small distance between the nostrils compared to the distance between the ears. In this respect, there is very little difference between observations made with such odorants as benzol, eucalyptus, cloves, and lavender. The existence of an analogy between hearing and smelling may help to delineate some electrophysiological correlates of the directional sensation, which is so well developed in both senses. localization of olfactory stimuli; interaction between the two nostrils during smelling; time pattern and olfactory localization; olfactory sensation magnitude and duration of stimulus; combination of smell and taste into a single sensation Submitted on November 1, 1963

The effect of vibrotactile noise on the growth of sensation magnitude and on the intensity DL

1992 ◽  
Vol 92 (4) ◽  
pp. 2436-2436
Author(s):  
George A. Gescheider ◽  
Stanley J. Bolanowski ◽  
Christopher C. Mascia ◽  
Karen L. Hall ◽  
Ronald T. Verrillo
Keyword(s):  
Sensation Magnitude

Magnitude Estimation and Magnitude Production: Stimulus Frequency Effects on Magnitudes of Lingual Vibrotactile Sensation

1987 ◽  
Vol 64 (2) ◽  
pp. 663-670 ◽  
Author(s):  
Linda Petrosino ◽  
Donald Fucci ◽  
Daniel Harris
Keyword(s):  
Magnitude Estimation ◽  
Stimulus Frequency ◽  
Vibrotactile Stimulus ◽  
Psychophysical Method ◽  
Magnitude Production ◽  
Sensation Level ◽  
Estimation Task ◽  
Growth Functions ◽  
Sensation Magnitude ◽  
Production Values

The methods of magnitude estimation and magnitude production were employed to investigate the effects of stimulus frequency on suprathreshold lingual-vibrotactile sensation-magnitude functions. The method of magnitude estimation was used to obtain numerical judgments of sensation magnitudes for nine stimulus intensities presented to the anterior dorsum of the tongue. The vibrotactile stimulus frequencies employed for 10 subjects ( M age = 21.1 yr.) were 100, 250, and 400 Hz. The numerical responses obtained during the magnitude-estimation task were in turn used as stimuli to obtain magnitude-production values for the same three vibrotactile stimulus frequencies. The results appeared to present two suggestions. First, the effects of stimulus frequency on lingual vibrotactile-sensation magnitudes may be dependent on the psychophysical method used in any particular experiment. Second, lingual-vibrotactile magnitude-estimation scales may demonstrate asymptotic growth functions above about 25 dB sensation level. The limitation in the growth of sensation magnitude occurred for all three vibrotactile stimulus frequencies employed.

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