scholarly journals Interocular difference thresholds are mediated by binocular differencing, not summing, channels

2019 ◽  
Vol 19 (14) ◽  
pp. 18 ◽  
Author(s):  
Frederick A. A. Kingdom ◽  
Nour M. Seulami ◽  
Ben J. Jennings ◽  
Mark A. Georgeson
Keyword(s):  
Difference Thresholds ◽  
Interocular Difference

Temperature of sugar solutions during tasting affects sweetness difference thresholds

LWT ◽  
2021 ◽  
Vol 138 ◽  
pp. 110676
Author(s):  
Harald Rohm ◽  
Bettina Wessel ◽  
Susann Zahn
Keyword(s):  
Difference Thresholds

Lifted-Weight Difference Thresholds as a Function of Hand

1978 ◽  
Vol 46 (1) ◽  
pp. 175-178 ◽  
Author(s):  
William A. Siders ◽  
Harry Hoffman ◽  
Bradley B. Glanville
Keyword(s):  
College Students ◽  
Weight Changes ◽  
Weight Difference ◽  
Left Handed ◽  
Perceived Weight ◽  
Left And Right ◽  
Difference Thresholds

A study was conducted to determine if the two hands of right-handers are differentially sensitive to changes in perceived weight. Using the method of limits, the left and right hands of 20 college students were tested at each of three reference weights: 90, 100, and 110 gm. Results indicated that, over-all, difference thresholds for the two hands were not reliably different, though a trend did emerge toward greater right-handed sensitivity to weight changes at smaller weights and greater left-handed sensitivity at greater weights.

Olfactory intensity-difference thresholds in the pigeon.

1969 ◽  
Vol 67 (1) ◽  
pp. 64-69 ◽  
Author(s):  
Stephen A. Shumake ◽  
James C. Smith ◽  
Don. Tucker
Keyword(s):  
Intensity Difference ◽  
Difference Thresholds

Whiteness difference thresholds in dentistry

2019 ◽  
Vol 35 (2) ◽  
pp. 292-297 ◽  
Author(s):  
María M. Pérez ◽  
Luis Javier Herrera ◽  
Francisco Carrillo ◽  
Oscar E. Pecho ◽  
Diana Dudea ◽  
...  
Keyword(s):  
Difference Thresholds

scholarly journals Functional Role of Auditory Cortex in Frequency Processing and Pitch Perception

2002 ◽  
Vol 87 (1) ◽  
pp. 122-139 ◽  
Author(s):  
Mark Jude Tramo ◽  
Gaurav D. Shah ◽  
Louis D. Braida
Keyword(s):  
Auditory Cortex ◽  
Pure Tone ◽  
Current Knowledge ◽  
Frequency Discrimination ◽  
Frequency Selectivity ◽  
Frequency Resolution ◽  
Frequency Change ◽  
Fine Grained ◽  
Difference Thresholds ◽  
Frequency Processing

Microelectrode studies in nonhuman primates and other mammals have demonstrated that many neurons in auditory cortex are excited by pure tone stimulation only when the tone's frequency lies within a narrow range of the audible spectrum. However, the effects of auditory cortex lesions in animals and humans have been interpreted as evidence against the notion that neuronal frequency selectivity is functionally relevant to frequency discrimination. Here we report psychophysical and anatomical evidence in favor of the hypothesis that fine-grained frequency resolution at the perceptual level relies on neuronal frequency selectivity in auditory cortex. An adaptive procedure was used to measure difference thresholds for pure tone frequency discrimination in five humans with focal brain lesions and eight normal controls. Only the patient with bilateral lesions of primary auditory cortex and surrounding areas showed markedly elevated frequency difference thresholds: Weber fractions for frequency direction discrimination (“higher”—“lower” pitch judgments) were about eightfold higher than Weber fractions measured in patients with unilateral lesions of auditory cortex, auditory midbrain, or dorsolateral frontal cortex; Weber fractions for frequency change discrimination (“same”—“different” pitch judgments) were about seven times higher. In contrast, pure-tone detection thresholds, difference thresholds for pure tone duration discrimination centered at 500 ms, difference thresholds for vibrotactile intensity discrimination, and judgments of visual line orientation were within normal limits or only mildly impaired following bilateral auditory cortex lesions. In light of current knowledge about the physiology and anatomy of primate auditory cortex and a review of previous lesion studies, we interpret the present results as evidence that fine-grained frequency processing at the perceptual level relies on the integrity of finely tuned neurons in auditory cortex.

scholarly journals Temporal difference thresholds and repetitive stimulation: Can click trains improve temporal sensitivity?

2021 ◽  
Author(s):  
Emily A. Williams ◽  
Ruth Ogden ◽  
Andrew James Stewart ◽  
Luke Anthony Jones
Keyword(s):  
Internal Clock ◽  
Theory Model ◽  
Repetitive Stimulation ◽  
Difference Threshold ◽  
Temporal Difference ◽  
Temporal Bisection ◽  
Null Result ◽  
Verbal Estimation ◽  
Difference Thresholds ◽  
Main Component

Trains of auditory clicks increase subsequent judgements of stimulus duration by approximately 10%. Scalar timing theory suggests this is due to a 10% increase in pacemaker rate, a main component of the internal clock. The effect has been demonstrated in many timing tasks, including verbal estimation, temporal generalisation, and temporal bisection. However, the effect of click trains has yet to be examined on temporal sensitivity, commonly measured by temporal difference thresholds. We sought to investigate this both experimentally; where we found no significant increase in temporal sensitivity, and computationally; by modelling the temporal difference threshold task according to scalar timing theory. Our experimental null result presented three possibilities which we investigated by simulating a 10% increase in pacemaker rate in a newly-created scalar timing theory model of thresholds. We found that a 10% increase in pacemaker rate led to a significant improvement in temporal sensitivity in only 8.66% of 10,000 simulations. When a 74% increase in pacemaker rate was modelled to simulate the filled-duration illusion, temporal sensitivity was significantly improved in 55.36% of simulations. Therefore, scalar timing theory does predict improved temporal sensitivity for a faster pacemaker, but the effect of click trains (a supposed 10% increase) appears to be too small to be reliably found in the temporal difference threshold task.

Interocular difference in progression of glaucoma correlates with interocular differences in retrobulbar circulation

2000 ◽  
Vol 129 (6) ◽  
pp. 728-733 ◽  
Author(s):  
Joerg Schumann ◽  
Selim Orgül ◽  
Konstantin Gugleta ◽  
Barbara Dubler ◽  
Josef Flammer
Keyword(s):  
Interocular Difference
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