Reaction time to onset and cessation of a visual stimulus

1961 ◽  
Vol 11 (3) ◽  
pp. 265-268 ◽  
Author(s):  
Jack D. Rains
Keyword(s):  
Reaction Time ◽  
Visual Stimulus ◽  
Time To Onset

Startle Reflex Habituation in Children with Cerebral Palsy

1979 ◽  
Vol 48 (3_suppl) ◽  
pp. 1135-1139 ◽  
Author(s):  
Joel Goldberg ◽  
David E. Anderson ◽  
Stephen Wilder
Keyword(s):  
Cerebral Palsy ◽  
Reaction Time ◽  
Auditory Stimulus ◽  
Visual Stimulus ◽  
Stimulus Presentation ◽  
Startle Reflex ◽  
Startle Stimulus ◽  
Normal Children ◽  
Children With Cerebral Palsy ◽  
Mean Reaction Time

Two groups of children (9 with cerebral palsy and 10 normals, matched for sex and age) participated in a study of the startle reflex. Each child was instructed to press a button as soon as possible after the onset of a visual stimulus on a box on the table at which they were seated. During some of the trials, a sudden and intense auditory stimulus (85 dB) was presented concomitantly with the onset of the visual stimulus, and effects on reaction time recorded. Mean reaction time of normal children was significantly faster than that of the group with cerebral palsy. The magnitude of disruption associated with the first startle stimulus presentation was significantly greater for cerebral palsied children. The course between groups of habituation to the startle stimuli was not significantly different. Data support the hypothesis that startle reflexes of children with cerebral palsy are more marked than are those of normal children.

Latency of Vocalization Onset: Stutterers Versus Nonstutterers

1976 ◽  
Vol 19 (3) ◽  
pp. 481-492 ◽  
Author(s):  
C. Woodruff Starkweather ◽  
Paula Hirschman ◽  
Robert S. Tannenbaum
Keyword(s):  
Reaction Time ◽  
Visual Stimulus ◽  
Internal Clock ◽  
Cerebral Dominance ◽  
Comparable Amount ◽  
Auditory Dysfunction ◽  
The Difference

Eleven stutterers and matched controls were asked to produce as quickly as possible each of 26 different syllables following a visual stimulus. Three trials were given for each syllable. Responses were filtered to remove supraglottally produced sounds, and the time between the visual stimulus and the onset of vocalization was measured by a voice-operated relay and a computer’s internal clock. The results suggested that stutterers are slower in initiating vocalization across a wide variety of syllables, and the difference averages about 65 msec. Furthermore, when phonologic conditions delayed voice onset by a comparable amount, the stutterers gained enough time so that no significant differences were observed between the two groups. The results are interpreted as suggesting that auditory dysfunction cannot be a cause for slower vocalization reaction time in stutterers but that either vocal dysfunction or a lack of cerebral dominance may be responsible for these differences.

Effects of wavelength and retinal locus on the reaction time to onset and offset stimulation.

1968 ◽  
Vol 78 (4, Pt.1) ◽  
pp. 699-701 ◽  
Author(s):  
Neil R. Bartlett ◽  
Thomas G. Sticht ◽  
Victor P. Pease
Keyword(s):  
Reaction Time ◽  
Retinal Locus ◽  
Time To Onset

Hospitalization and Simple Reaction Time

1965 ◽  
Vol 20 (1) ◽  
pp. 175-180 ◽  
Author(s):  
Robert J. Resnick
Keyword(s):  
Reaction Time ◽  
Visual Stimulus ◽  
Differential Effect ◽  
Simple Reaction Time ◽  
Hospitalized Patients ◽  
Auditory Stimuli ◽  
Time Study ◽  
Simple Reaction ◽  
Reaction Time Study

Previous studies have raised the question of the validity of using only hospitalized Ss as controls when the results are generalized to a non-hospitalized population. Twelve male hospitalized Ss and 12 male non-hospitalized Ss participated in a reaction time study using the visual and auditory modalities under constant 6-, 9-, and 15-sec. foreperiod conditions. The data showed significant differences between groups in all foreperiods with the auditory stimuli and the 15-sec. foreperiod with the visual stimulus. Results are discussed in terms of the use of hospitalized patients as controls in research and the differential effect of foreperiod and modality on the two groups studied.

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