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Book The Determinants of Reaction Times

Download or read book The Determinants of Reaction Times written by Scott Theodore Janssen and published by . This book was released on 2015 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The central nervous system has the ability to generate very rapid 'temporally urgent' sensory motor reactions in response to stimuli under certain conditions. For example, temporally urgent reactions have been shown to occur during control of protective responses, such as regaining balance after a perturbation or reacting rapidly to a startling auditory stimulus. Two different mechanisms have been proposed to the observation of rapid reaction times; 1) different (shorter) pathway for those reactions with very rapid reactions and/or 2) increased synaptic excitability to reduce the time required at each site of synaptic convergence leading to a reduction in total reaction time. The overarching hypothesis of this work is that the occurrence of rapid reactions is mediated by the facilitation of pathways through stimulus driven and/or central facilitation leading to significant reduction in reaction time. The current work is delimited to a focus on the determinants of reaction time in response to auditory stimuli. Two studies were conducted to determine the relationship between stimulus intensity and behavioural and neurological responses. Study one focused on influence of stimulus intensity on simple and choice reaction time performance. Choice reaction time is distinguished by need for higher level cortical processing for decision making. Stimulus induced changes in choice reaction time would be most likely accounted for by pathway facilitation. Results from study one showed an overall decrease in choice reaction time to an increase in stimulus intensity with no difference in errors suggesting an increase in stimulus intensity results in increase synaptic facilitation. Study two focused on electrophysiological events associated with auditory stimuli. It was proposed that evidence of more rapid electrophysiological events and increased amplitude would support a model of synaptic facilitation with increases in auditory stimulus intensity. Results from study two showed decreased peak latencies with high stimulus amplitudes as well as increased cortical activity prior to motor responses further suggesting reductions in reaction time to increases in stimulus intensity are a result of increased synaptic facilitation. Overall this thesis is focussed on developing a further understanding of stimulus intensity as a determinant of reaction time so that in the future one may better understand the factors that contribute to slowing in older adults and those with neurological impairment.

Book Intensity of the RT Ready signal as a Determinant of Adaptation Level

Download or read book Intensity of the RT Ready signal as a Determinant of Adaptation Level written by David L. Kohfeld and published by . This book was released on 1968 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Forty male Ss were given a simple reaction time (RT) test with four ready-signal conditions, 10 Ss in each condition. A fifth group of 12 Ss received all four ready-signal conditions in a counterbalanced order on consecutive days. The results indicated that a 90-db ready-signal produced the slowest mean RT, 30-db the fastest, 60-db intermediate, while a random combination of ready-signals with a mean of 60-db also produced intermediate RTs. It was concluded that the ready-signal served as an adaptation stimulus against which the response-signals were perceived. (Author).

Book The Relation Between the Magnitude of Stimulus and the Time of Reaction

Download or read book The Relation Between the Magnitude of Stimulus and the Time of Reaction written by Sven Froeberg and published by . This book was released on 1907 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1981 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Psychophysical Judgment and Measurement

Download or read book Psychophysical Judgment and Measurement written by Edward Carterette and published by Elsevier. This book was released on 2012-12-02 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Perception, Volume II: Psychophysical Judgment and Measurement brings together a very large, diverse, and widely scattered literature on human perception, with emphasis on psychophysical judgement and measurement. The book reviews the history of research on choice, judgement, and measurement in order to provide a background for contemporary work. This volume is organized into five sections encompassing 14 chapters and begins with a historical background on psychophysics and the evolution of thinking about the central measurement problem in judgement. The basic psychological context in which choice and judgement occur is considered next, touching on topics such as the problem of information selection and the sources of bias and variability in judgemental processes in relation to memory. The chapters that follow discuss the theoretical frame of measurement models and their applications. In particular, examples of algebraic fundamental measurement, algebraic derived measurement, and probabilistic derived measurement are given. The book also introduces the reader to various psychophysical scaling methods and theories of scaling. This book will serve as a basic source and reference work for psychologists and natural scientists, as well as for anyone in the arts or sciences or those who are interested in human perception.

Book Effects of Stimulus Intensity and Method of Stimulus Presentation Upon Simple Reaction Time

Download or read book Effects of Stimulus Intensity and Method of Stimulus Presentation Upon Simple Reaction Time written by Harry George Murray and published by . This book was released on 1968 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The American Journal of Psychology

Download or read book The American Journal of Psychology written by Granville Stanley Hall and published by . This book was released on 1969 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Report US Army Medical Research Laboratory

Download or read book Report US Army Medical Research Laboratory written by Army Medical Research Laboratory and published by . This book was released on 1947 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Cumulated Index Medicus

Download or read book Cumulated Index Medicus written by and published by . This book was released on 1992 with total page 1444 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book American Journal of Mental Deficiency

Download or read book American Journal of Mental Deficiency written by and published by . This book was released on 1969 with total page 902 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes the association's conference proceedings and addresses.