Reaction times measured in a choice reaction time and a double task condition: A small twin study

1991 ◽  
Vol 12 (6) ◽  
pp. 519-522 ◽  
Author(s):  
Dorret I. Boomsma ◽  
Riek J.M. Somsen
Keyword(s):  
Reaction Time ◽  
Choice Reaction Time ◽  
Twin Study ◽  
Reaction Times ◽  
Task Condition

Stability of Choice Reaction Time and Synchronicity of Peak Emg Values during Bimanual Reactions

1992 ◽  
Vol 75 (1) ◽  
pp. 165-166 ◽  
Author(s):  
Bert De Brabander ◽  
Pol Gerits ◽  
Christophe Boone
Keyword(s):  
Reaction Time ◽  
Analysis Of Variance ◽  
Choice Reaction Time ◽  
Reaction Times ◽  
Repeated Measurements ◽  
Measurement Period

18 volunteers of our Faculty participated in two quasi-identical experiments six months apart. Repeated measurements of reaction time and synchronicity of peak forearm EMG values during bimanual reactions are analyzed by means of analysis of variance with subjects and measurement period as factors. Using Ebel's formula, test-retest reliabilities derived from the analysis vary between .82 and .94 for reaction times on different tasks and conditions and between .75 and .92 for synchronicity of peak EMG values.

Study of Neuromotor Reaction Times under the Influence of Thyrotropin-Releasing Hormone

1987 ◽  
Vol 65 (2) ◽  
pp. 627-636 ◽  
Author(s):  
Dan Repperger ◽  
Tom Jennings ◽  
James Jacobson ◽  
Norman Michel ◽  
Chuck Goodyear ◽  
...  
Keyword(s):  
Reaction Time ◽  
Choice Reaction Time ◽  
Simple Reaction Time ◽  
Reaction Times ◽  
Thyrotropin Releasing Hormone ◽  
Double Blind Study ◽  
Experimental Conditions ◽  
Releasing Hormone ◽  
Simple Reaction ◽  
Decision Choice

Neuromotor reaction times (simple, choice, and decision) were measured when Thyrotropin-releasing hormone (TRH) was administered intravenously to nine healthy men in a double-blind study. Measurements were made of simple reaction time, choice reaction time, and decision time for each subject at various intervals over a 54-hr. period. Given the observed inherent interaction of the drug with the long time used (54 hr.), most analyses were conducted across separate time epochs. Injected subjects showed inhibition in the normal improvement of simple reaction time (which occurs with practice), and they reduced the time required to make a decision. Choice reaction time, however, remained unchanged across the drug-nondrug experimental conditions.

scholarly journals Learning to search. The importance of eye movements in the decrease of response times during a visual choice reaction time task

2016 ◽  
Vol 9 (5) ◽  
Author(s):  
Aleksandra Kroll ◽  
Monika Mak ◽  
Jerzy Samochowiec
Keyword(s):  
Eye Movements ◽  
Reaction Time ◽  
Choice Reaction Time ◽  
Visual Target ◽  
Response Times ◽  
Reaction Times ◽  
Reaction Time Task ◽  
Visual Tasks ◽  
Target Searching

Reaction times are often used as an indicator of the efficiency of the processes in thecentral nervous system. While extensive research has been conducted on the possibleresponse time correlates, the role of eye movements in visual tasks is yet unclear. Here wereport data to support the role of eye movements during visual choice reaction time training.Participant performance, reaction times, and total session duration improved. Eyemovementsshowed expected changes in saccade amplitude and resulted in improvementin visual target searching.

Temporal Characteristics of Interstimulus Interval in Serial Choice Reaction Time,

1973 ◽  
Vol 37 (3) ◽  
pp. 723-726
Author(s):  
Robert P. Fishburne ◽  
Wayne L. Waag
Keyword(s):  
Reaction Time ◽  
Choice Reaction Time ◽  
Interstimulus Interval ◽  
Reaction Times ◽  
Reaction Time Task ◽  
Choice Reaction Time Task ◽  
Interval Duration ◽  
Random Interval ◽  
Temporal Characteristics ◽  
The Mean

The present study investigated the effects of presentation schedule and interstimulus interval duration in a serial choice reaction-time task. 45 Ss were randomly assigned to fixed, patterned, and random schedules having durations of interstimulus intervals of 2, 3, and 4 sec. As the regularity of the presentation schedule decreased, reaction time increased. For fixed-interval presentation, reaction time increased as a function of duration while the quickest reaction times occurred at the mean interstimulus interval for random-interval presentation. Reaction times remained the same under the patterned-interval presentation schedule.

Decisions concerning the Rejected Channel

1966 ◽  
Vol 18 (3) ◽  
pp. 260-265 ◽  
Author(s):  
Everdina A. Lawson
Keyword(s):  
Reaction Time ◽  
Choice Reaction Time ◽  
Simple Reaction Time ◽  
Reaction Times ◽  
False Positives ◽  
Auditory Stimuli ◽  
Simple Reaction ◽  
The Third ◽  
Verbal Messages

It was thought that the physical aspects of auditory stimuli were possibly transmitted via separate pathways from those transmitting the verbal aspects. Three experiments were designed to test this hypothesis. In these experiments subjects had to perform a shadowing task and had to respond simultaneously on response keys to pips superimposed in either ear on verbal messages. The response to these pips was of increasing complexity, in that it was a simple reaction time which was measured in the first experiment, a choice reaction time in the second experiment and a more complex choice reaction time in the third experiment. Subjects were able to perform these tests although the increasing difficulty was reflected in longer reaction times and more errors. The reaction times to the pips presented to the ear which was not being shadowed were slower, and the errors, made to pips in both channels, were “false positives” rather than errors of omission. These results were taken as favouring the hypothesis.

scholarly journals Effects of disorganization on choice reaction time and visual orientation in untreated schizophrenics

2006 ◽  
Vol 8 (1) ◽  
pp. 53-58
Keyword(s):  
Reaction Time ◽  
Choice Reaction Time ◽  
Processing Speed ◽  
Reaction Times ◽  
Cost Benefit ◽  
Visual Orientation ◽  
Attentional Disengagement ◽  
Syndrome Scale ◽  
Second Generation Antipsychotics ◽  
Release Condition

Several preattentive mechanisms have proved to be sensitive markers of clinical change in schizophrenia. Two related studies of visuospatial orientation used cued target detection combined with choice reaction time, short/long preparation, with or without a signal/target interval ("gap"/ "no-gap," to detect attentional disengagement difficulty in schizophrenia). End points were reaction times, alertness scores, attentional cost/benefit, and validity scores. Study 1, in 13 schizophrenics receiving second-generation antipsychotics and 13 controls, found the same impairment of disengagement as with neuroleptics, but intact reaction times and processing speed, with no hemispheric asymmetry. Study 2, in 12 untreated acute schizophrenics and 12 controls, showed slower reaction times, near-zero alertness in the fixation release condition, and impaired valid/invalid discrimination versus Syndrome Scale disorganization subscore (r = -0.81; P < 0.01). Early deficits in the preattentive orientation and visual. Early deficits in the preattentive orientation and visual detection phases are useful for assessing response to psychotropic treatment and establishing clinical correlates in acute schizophrenia.

Identifying Pedophilic Interest in Sex Offenders Against Children With the Indirect Choice Reaction Time Task

2017 ◽  
Vol 33 (5) ◽  
pp. 345-351 ◽  
Author(s):  
Beate Dombert ◽  
Jan Antfolk ◽  
Lisa Kallvik ◽  
Angelo Zappalà ◽  
Michael Osterheider ◽  
...  
Keyword(s):  
Reaction Time ◽  
Sex Offenders ◽  
Choice Reaction Time ◽  
Sexual Interest ◽  
Reaction Times ◽  
Reaction Time Task ◽  
Forensic Assessment ◽  
Self Report ◽  
High Rate ◽  
Participant Group

Abstract. Pedophilia – a disorder of sexual preference with primary sexual interest in prepubescent children – is forensically relevant yet difficult to detect using self-report methods. The present study evaluated the criterion validity of the Choice Reaction Time (CRT) task to differentiate between a sample of child sex offenders with a presumably high rate of pedophilic individuals and three control groups (other sex offenders, non-sex offenders, and community controls, all male; N = 233). The CRT task required locating a dot superimposed on images depicting men, women, girls, or boys and scrambled pictures as quickly as possible. We used two picture sets, the Not Real People (NRP) set and the Virtual People Set (VPS). We predicted sexually relevant pictures to elicit longer reaction times in interaction with the participant group. Both CRTs showed main effects of stimulus explicitness and preferred stimulus gender. The CRT-NRP also yielded an interaction effect of participant group and stimulus maturity while the CRT-VPS showed a tendency in this direction. The overall effect size was moderate. Results offer support for the usefulness of the CRT task in forensic assessment of child sex offenders.

Choice Reaction Time in Workers Exposed to Styrene Vapour

1986 ◽  
Vol 5 (2) ◽  
pp. 85-89 ◽  
Author(s):  
C.J. Mackay ◽  
G.R. Kelman
Keyword(s):  
Reaction Time ◽  
Choice Reaction Time ◽  
Mandelic Acid ◽  
Reaction Times ◽  
Acid Excretion ◽  
High Exposure ◽  
Female Workers ◽  
Excretion Rates ◽  
Uptake And Metabolism ◽  
Post Shift

1 Behavioural effects of occupational exposure to vapour from styrene-based resin were investigated in 10 female workers with a portable test of choice reaction time. Testing was carried out both at the beginning and end of the day's shift. 2 Uptake and metabolism of styrene were assessed by monitoring post-shift urinary mandelic acid excretion rates. By using these data workers were allocated to three groups reflecting zero, low )r high exposure. 3 After exposure slowing of reaction times was found in those with the highest mandelic acid excretion rates, whereas a slight improvement or no change was found in those with low or zero exposure. 4 Subsequent improvements in extraction and ventilation in the workroom were shown to be associated with both decreased mandelic acid excretion and absence of long reaction times in those previously most heavily exposed.

On the Rate of Gain of Information

1952 ◽  
Vol 4 (1) ◽  
pp. 11-26 ◽  
Author(s):  
W. E. Hick
Keyword(s):  
Information Theory ◽  
Reaction Time ◽  
Choice Reaction Time ◽  
Analytical Methods ◽  
Choice Experiment ◽  
Conceptual Models ◽  
Reaction Times ◽  
A Value ◽  
Principal Finding ◽  
Objective Uncertainty

The analytical methods of information theory are applied to the data obtained in certain choice-reaction-time experiments. Two types of experiment were performed: (a) a conventional choice-reaction experiment, with various numbers of alternatives up to ten, and with a negligible proportion of errors, and (b) a ten-choice experiment in which the subjects deliberately reduced their reaction time by allowing themselves various proportions of errors. The principal finding is that the rate of gain of information is, on the average, constant with respect to time, within the duration of one perceptual-motor act, and has a value of the order of five “bits” per second. The distribution of reaction times among the ten stimuli in the second experiment is shown to be related to the objective uncertainty as to which response will be given to each stimulus. The distribution of reaction times among the responses is also related to the same uncertainty. This is further evidence that information is intimately concerned with reaction time. Some possible conceptual models of the process are considered, but tests against the data are inconclusive.

The Effect of Part Proliferation on Assembly Line Operators' Decision Making Capabilities

1979 ◽  
Vol 23 (1) ◽  
pp. 169-173
Author(s):  
Susanne M. Gatchell
Keyword(s):  
Decision Making ◽  
Reaction Time ◽  
Choice Reaction Time ◽  
Assembly Line ◽  
Research Study ◽  
Reaction Times ◽  
Decision Time ◽  
Error Rates

In order to quantify the effects of part proliferation on assembly line operators' decision making capabilities, a research study was conducted. Using a Choice Reaction Time technique, 16 operators were tested to determine their reaction times and error rates when selecting parts. These operators were from four training levels (trained, relief, untrained/job and untrained/plant) and had to decide between 4, 7 or 10 major parts. Results show that operators with 10 parts made 46% more errors and needed 13% more decision time than operators with 4 parts. Furthermore, the relief and untrained/job operators made three times more errors than the trained operators. The untrained/plant operators had over five times more errors than the trained operators. These results indicate that all operators could make a selection when working with 10 major parts. However, their reaction times and error rates increased as the number or parts increased from 4 to 10.

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