scholarly journals Age-related variations in evoked potentials to auditory stimuli in normal human subjects

1978 ◽  
Vol 44 (4) ◽  
pp. 447-458 ◽  
Author(s):  
Douglas S Goodin ◽  
Kenneth C Squires ◽  
Beverley H Henderson ◽  
Arnold Starr
Keyword(s):  
Evoked Potentials ◽  
Human Subjects ◽  
Auditory Stimuli ◽  
Age Related ◽  
Normal Human

scholarly journals Endogenous hyperthermia in normal human subjects: I. Experimental study of evoked potentials and reaction time

1985 ◽  
Vol 13 (4) ◽  
pp. 258-267 ◽  
Author(s):  
Dennis L. Reeves ◽  
Don R. Justesen ◽  
Daniel M. Levinson ◽  
Donald W. Riffle ◽  
Edward L. Wike
Keyword(s):  
Experimental Study ◽  
Reaction Time ◽  
Evoked Potentials ◽  
Human Subjects ◽  
Normal Human

scholarly journals Age-Related Changes in Human Posture Control: Motor Coordination Tests

1990 ◽  
Vol 1 (1) ◽  
pp. 87-96 ◽  
Author(s):  
R.J. Peterka ◽  
F.O. Black
Keyword(s):  
Motor Coordination ◽  
Center Of Pressure ◽  
Human Subjects ◽  
Body Sway ◽  
Support Surface ◽  
Age Related ◽  
Postural Responses ◽  
Surface Displacements ◽  
Normal Human ◽  
Motor Tests

Postural responses to support surface displacements were measured in 214 normal human subjects ranging in age from 7 to 81 y. Motor tests measured leg muscle electromyographic (EMG) latencies, body sway, and the amplitude and timing of changes in center of pressure displacements in response to sudden forward and backward horizontal translations of the support surface upon which the subjects stood. There were small increases in both EMG latencies and the time to reach the peak amplitude of center of pressure responses with increasing age. The amplitude of center of pressure responses showed no change with age if the amplitude measures were normalized by a factor related to subject height. In general, postoral responses to sudden translations showed minimal changes with age, and all age-related trends that were identified were small relative to the variability within the population.

Auditory Influences on Visual Temporal Rate Perception

2003 ◽  
Vol 89 (2) ◽  
pp. 1078-1093 ◽  
Author(s):  
Gregg H. Recanzone
Keyword(s):  
Visual Perception ◽  
Auditory System ◽  
Human Subjects ◽  
Visual Stimuli ◽  
Sensory System ◽  
Spatial Location ◽  
Auditory Stimuli ◽  
Spatial Tasks ◽  
Normal Human ◽  
Temporal Rate

Visual stimuli are known to influence the perception of auditory stimuli in spatial tasks, giving rise to the ventriloquism effect. These influences can persist in the absence of visual input following a period of exposure to spatially disparate auditory and visual stimuli, a phenomenon termed the ventriloquism aftereffect. It has been speculated that the visual dominance over audition in spatial tasks is due to the superior spatial acuity of vision compared with audition. If that is the case, then the auditory system should dominate visual perception in a manner analogous to the ventriloquism effect and aftereffect if one uses a task in which the auditory system has superior acuity. To test this prediction, the interactions of visual and auditory stimuli were measured in a temporally based task in normal human subjects. The results show that the auditory system has a pronounced influence on visual temporal rate perception. This influence was independent of the spatial location, spectral bandwidth, and intensity of the auditory stimulus. The influence was, however, strongly dependent on the disparity in temporal rate between the two stimulus modalities. Further, aftereffects were observed following approximately 20 min of exposure to temporally disparate auditory and visual stimuli. These results show that the auditory system can strongly influence visual perception and are consistent with the idea that bimodal sensory conflicts are dominated by the sensory system with the greater acuity for the stimulus parameter being discriminated.

Observations on a Relationship between Steroid Metabolism and the Concentration of Plasma Fibrinogen

1963 ◽  
Vol 10 (02) ◽  
pp. 400-405 ◽  
Author(s):  
B. A Amundson ◽  
L. O Pilgeram
Keyword(s):  
Blood Coagulation ◽  
Methyl Ether ◽  
Broad Spectrum ◽  
Human Subjects ◽  
Plasma Fibrinogen ◽  
Steroid Metabolism ◽  
Specific Site ◽  
Chain Reaction ◽  
Normal Human ◽  
A Chain

SummaryEnovid (5 mg norethynodrel and 0.075 mg ethynylestradiol-3-methyl ether) therapy in young normal human subjects causes an increase in plasma fibrinogen of 32.4% (P >C 0.001). Consideration of this effect together with other effects of Enovid on the activity of specific blood coagulatory factors suggests that the steroids are exerting their effect at a specific site of the blood coagulation and/or fibrinolytic system. The broad spectrum of changes which are induced by the steroids may be attributed to a combination of a chain reaction and feed-back control.

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