Showing papers on "Latency (engineering) published in 1977"

Acoustic Tumor Detection With Brain Stem Electric Response Audiometry

Abstract: • Tumors that press on the auditory nerve can cause a latency increase that is detectable from the scalp by electric response audiometry (BERA). The response delay is best seen by comparing the Jewett wave V, or P5, latencies for the two ears. This interaural latency difference is normally less than 0.2 msec, but was 0.4 msec or greater for 35 acoustic tumor cases and for seven of ten other temporal bone tumors. Acoustic tumor size can be estimated from the amount of latency delay. (Arch Otolaryngol103:181-187, 1977)

Effect of click rate on the latency of auditory brain stem responses in humans.

Abstract: Auditory brain stem responses are the far-field reflections of electrical activity originating in the auditory pathway in its course from the cochlea to cortex that can be recorded from scalp electrodes using computer averaging techniques. There are seven components in the initial 10 msec following a click signal which have been shown to have an orderly change in latency as a function of signal intensity. The results of this study show that click repetition rate can also significantly affect the response latency measure. Responses were measured in six normal hearing subjects at click rates of 10, 30, 50 and 100/sec and af four intensity levels (30, 40, 50, and 60 dB sensation level). The mean latency shift of component V was approximately 0.5 msec when the responses at 10 and 100/sec were compared. This is equivalent to a 15-20 dB decrease in signal intensity at the 10/sec click rate. An analysis of the time of occurrence of this shift using brief click trains at 100/sec showed the shift in latency to be complete by the fifth click. The latency shift was similar at the four signal levels tested. The latency shift was similar at the four signal levels tested. The latency shift of component V appeared to be a monaural and therefore a potentially peripheral process. The results are interpreted as an objective measure of adaptation in the human auditory system with implications for the measurement in disorders of hearing.

Validity of Subjective Reports of Sleep Latency in Normal Subjects

Abstract: The validity of subjective reports of sleep latency was tested in 28 normal subjects aged 20 to 55 yr who answered a general questionnaire about their sleep habits, described their sleep latency at home in a series of daily reports, and also slept in the laboratory for 3 to 12 nights each enabling objective measurements of their sleep latency to be made from the electro encephalogram The geometric mean of the log-normally distributed sleep latencies for all 118 nights in the laboratory was 12·7 min, measured objectively, and was 13·3 min reported subjectively After adapting to the laboratory, the mean subjective latency for each subject was highly correlated with (r = 0·6 to 0·8) and was not significantly different from either the mean objective latency in the laboratory or the subjective latency at home The results indicate that subjective reports of habitual sleep latency are valid as well as reasonably reliable and accurate for groups of normal subjects, but are not very accurate for indivi

Psychotherapeutic Strategies in the Latency Years

Abstract: Interestingly, psychotherapeutic strategies in the latency years that you really wait for now is coming. It's significant to wait for the representative and beneficial books to read. Every book that is provided in better way and utterance will be expected by many peoples. Even you are a good reader or not, feeling to read this book will always appear when you find it. But, when you feel hard to find it as yours, what to do? Borrow to your friends and don't know when to give back it to her or him.

Some properties of threshold models of reaction latency

Abstract: In this paper the mathematical foundations of threshold models of response latency are specified and their latency distributions are derived. On the basis of existing models some new models are proposed and formalized. The results are described in a uniform way and may be useful in selecting a model to describe latency data.

A multiple-observations model for response latency and the latencies of correct and incorrect responses in recognition memory

Abstract: A model for response latency in recognition memory is described which is a strength model incorporating the notion of multiple observations and with the additional assumptions that the variance of the strength distributions increase with set size and that the observer attempts to keep his error rate at a constant level over set size. It is shown that the model can, without recourse to particular parameter values, predict a near linear RT set-size function and, since it is a (TSD) model in its decision aspects, can account for errors and hence error latencies in the recognition task. After the model is described, two experiments are performed which test the prediction that correct mean latency is generally shorter than incorrect mean latency. The prediction is confirmed and this feature is discussed in general, the model being compared with that of Juola, Fischler, Wood, and Atkinson (1971) in this respect. Some possible modifications to the latter model are also considered.

Voluntary eye movements and alcohol.

Abstract: Human voluntary horizontal eye-movements are studied prior and subsequent to the ingestion of alcohol. Such movements are important, especially during reading and driving. Infrared monitoring techniques were employed to record eye movements and eye-movement latency histograms were tabulated. Blood alcohol levels were continually monitored. Alcohol increases eye-movement latency but the maximum latency occurred in most cases at different elapsed times from the time of maximum blood alcohol level. In general, a roughly 20% increase in latency occurs subsequent to alcohol. Whether this added delay is a result of a general depression of the oculomotor system or a specific increase in some oculomotor computing element is unresolved. Within the limits of our experimentation, there was no difference between latency change observed in moderate and heavy drinkers. Language: en

Impulsive cognitive style: Three modification techniques

Abstract: Fifty-five boys aged 8-11, categorized as impulsives by means of the Matching Familiar Figures test, participated in a study comparing the effects of three different techniques, designed to change an impulsive cognitive style on response accuracy and response latency. One group of impulsives was trained to increase response latency by means of modeling and instructions. A second group was trained to increase response accuracy by a strategy of visual detailing. The third group was trained to increase response accuracy by a strategy of visual discrimination. The two groups trained to increase response accuracy showed a significant decrease in errors, as well as an increase in response latency. The “visual discrimination” group had a significantly shorter response latency than the “visual detailing” group. Subjects trained only to increase response latency did show a significant increase in latency; however, there was no decrease in errors.

Influence of age on residual latency.

Abstract: From the conduction studies of ulnar nerve on normal individuals of different age groups and sexes the residual latencies were determined. The age has no influence on the residual latency. But the values of residual latency decreased significantly in the case of females as compared with males.

Latency of chromatic stimuli

Abstract: 3. Whan a map, drawing or chart, etc., was part of the material being photographed the photographer followed a definite method in "sectioning" the material. It is customary to begin photoing at the upper left hand comer of a large sheet and to continue photoing from left to right in equal sections with a small overlap. If necessary, sectioning is continued again — beginning below the first row and continuing on until complete.

LOCAN: A general FORTRAN program for latency-operating characteristic (LOC) analysis

Abstract: A FORTRAN program to compute latency-operating characteristics (LOCs) is presented. Latency and accuracy scores from within-subject designs having equal cell frequencies and containing no missing data are appropriate. Output includes both latency measures (mean and median reaction times) and accuracy mea­ sures (d', d 12 • log odds. and log eta) for each latency band. The user determines the number of latency levels into which the data are partitioned. Input, output, and program subroutines are discussed.