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Results 601 - 643 of 643
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Inbar G F - - 1983
The present report presents an attempt to define the physiological parameter used to describe "voice tremor" in psychological stress evaluating machines, and to find its sources. This parameter was found to be a low frequency (5-20 Hz) random process which frequency modulates the vocal cord waveform and (independently) affects the ...
Brown T I - - 1982
1. The upper limbs of normal subjects were immobilized in a way that allowed measurement of forces and movements at the thumb interphalangeal joint without significant movement elsewhere in the limb. 2. When the subject attempted to maintain a steady flexing force at the joint against a rigid stop, the ...
Wade P - - 1982
In a normative study of amplitude, frequency, and variability of postural tremor of the hand in 97 normal subjects, 15 to 80 years old, tremor was transduced using accelerometers and characterized by power spectral analysis. Tremor amplitude ranged from a 0.0015- to 0.035-g peak at the dominant frequency. The modal ...
Sersen E A - - 1982
Disjunctive reaction times (RT) involving two interstimulus intervals were obtained from 10 subjects during 4 sessions while recording heart period, skin conductance, and EEG. Multiple regression analysis indicated complex relationships between RT and skin conductance and heart period which varied with session level. The relationship of RT and skin conductance ...
Pozos R S - - 1982
Comparisons were made between physiological tremor (PT), which is the involuntary oscillation produced when the leg is held in a plantarflexed position, and physiological action tremor (PAT), which is an involuntary oscillation associated with the voluntary slow raising and lowering of the heel. Frequency analysis using spectral techniques revealed a ...
Ellinwood E H EH - - 1981
Testing of a new radio frequency capacitance field type transducer and power spectrum analysis system for assessment of rat behavior is described. Power spectrum estimates of amphetamine-induced behavior had an orderly relationship with behavior ratings ranging from inactive to intense stereotypy. The effects of thorazine dose-response blocking on amphetamine-induced behavior ...
Pennebaker J W - - 1981
Two experiments demonstrated that the experience of physical sensations is the result of hypothesis-guided selective search and encoding. In the first experiment, subjects listened to a stimulus that was said to increase, decrease, or have no effect on skin temperature. The results indicated that subjects selectively monitored only those changes ...
Findley L J - - 1981
Resting and postural tremor, intention and action tremor, clonus and the cogwheel phenomenon in Parkinson's disease have been characterised in terms of frequency content using spectral analysis. Typical resting tremor ranged in peak frequency from 4 to 5.3 HZ with tremor in each individual varying only by 0.2 to 0.3 ...
Martin P - - 1980
The effect of brief vagal stimulus burst on atrial contractile force was assessed in paced- and unpaced-heart preparations by recording the changes in pressure (AP) generated in a balloon in the right atrial appendage or by a miniature strain gauge on the atrium. One and 3 stimuli per vagal burst ...
Lippold O C - - 1980
1 Finger tremor was recorded with a strain gauge and an accelerometer. 2 Records were subjected to frequency analysis and the amplitude or power at frequencies up to 25 Hz were computed. 3 Comparison was made between the tremor during a control period, during sham smoking and during smoking a ...
Sideroff S I - - 1980
Heroin addicts on 0 or 2 mg of methadone and finishing a 14-day detoxification program, and control subjects were shown a videotape of heroin-related stimuli. Psychological questionnaires were completed before and after the videotape, while physiological responses were monitored during viewing. It was found that the experimental subjects had an ...
Cussons P D - - 1980
1. Human subjects attempted to maintain a constant force by flexing their elbow against a spring which was attached to a force transducer at one end and the subject's wrist at the other. The tremor at 8-12 Hz which develops in this situation was enhanced in amplitude with negligible change ...
Cussons P D - - 1979
1. Irregularities in the development of tension during the tonic vibration reflex of the soleus muscle of the decerebrate cat have been analysed into their frequency components. The reflex was recorded isometrically and elicited by longitudinal vibration, normally at 150 Hz. The amplitude of vibration was set so as to ...
Walsh E G - - 1979
Rhythmic forces have been applied to the wrist of patients with Parkinsonism tremor by means of a printed motor. The tremor rate was not altered to that of the applied force. On the contrary, beats were established, the rate of which depended on the difference in rate between the tremor ...
Bow C R - - 1979
A mechanical real-time ultrasonic scanner utilizing a rotating transducer head has been successfully applied clinically to visualize the heart and abdomen. The design features of this scanner are discussed. The small dimensions and the 90 degree field of view of the sealed oil-filled transducer head optimize visualization of the heart ...
Behling K - - 1978
A method permitting measurement of finger tremor as a displacement-time curve is described, using a test system with simple amplitude calibration. The coordinates of the inversion points of the displacement-time curves were transferred through graphical input equipment to punched tape. By means of a computer program, periods and amplitudes of ...
Allum J H - - 1978
1. Tremor force was recorded during stationary isometric contractions of intrinsic hand muscles of normal subjects. Subjects maintained a steady force level between their thumb and forefinger for 30 s. The force level varied from weak (0.2 kg) to strong contractions (7 kg). These experimental conditions were the same as ...
Gruenau S P - - 1978
Previous studies have demonstrated two tremorgenic systems that involve separate brain mechanisms and exhibit different peak frequencies. One system (the thalamo-cortical) generates low frequency (4--8 Hz) tremor; the other (the olivo-cerebellar) produces high frequency (10--18 Hz) tremor. Based on this evidence, the present study focused on determining whether one or ...
Shimada K - - 1978
Development of daily rhythms in the chick heart rate was investigated during the post-hatching period. The measurements were made in free-moving chicks at one-hour intervals under different light conditions. Clear daily rhythms were seen 3 days after hatching under LD (12:12 hr.) whereas no daily rhythm was observed under either ...
Richter R - - 1977
Until now, no statistical data have been available on the significance of the frequency of FHR oscillations. In order to evaluate the relation between oscillation frequency and neonatal outcome, the last 30 minutes of 812 FHR records were analyzed with respect to the number of 812 FHR records were analyzed ...
Ockleford E M - - 1977
The effects of exposure to light were investigated during and shortly after the period of light stimulation. A particular objective was to evaluated any responses to the type of illumination conditions generally used for observation of avian embryos. Twenty 16-day Japanese quail embryos were illuminated for 15 minutes each during ...
Stiles R N - - 1977
Spectral analysis of ankle tremor records obtained from normal seated subjects during continuous elevation of the heel for 10-45 min revealed that the root-mean-square (rms) displacement amplitude of the tremor increased from minimum values of about 4 micronm to values as large as 4,000 micronm. Associated with this increase in ...
Kay L - - 1977
The paper describes a new pocket size instrument called the "Cardiophone" for the diagnosis of cardiac dysfunction. It is a continuous wave swept frequency ultrasonic echo-location system which produces dynamic auditory signals corresponding to the positional change of internal structures of the heart. The four valves are relatively easy to ...
Kaplan H B HB Department of Psychiatry, Baylor College of Medicine, Houston, - - 1977
It was hypothesized that adoption of deviant response patterns regardless of subsequent continuation of the act would be associated with an antecedent increase in negative self-attitudes. Subjects were seventh-grade students who responded to a questionnaire three times (T 1,T 2,T 3) at annual intervals (N=3,148). Self-attitudes were measured by a ...
Delpierre S - - 1977
In rabbits anaesthetized with ethyl-carbamate, stimulation of chemoreceptors afferents was allowed by transient hypercapnia, before and after vagal blockade by DC current. In these relatively fast breathing animals, the transient hypercapnia produced light changes of inspiratory tidal volume (VI), inspiratory (TI) and expiratory durations (TE). Despite the identity of transient ...
Ushiyama J - - 1977
In this study of factors affecting and integrating activity of cardiac tissues, isolated strips of rabbit atria containing the sinoatrial node were subject to sinusoidal stretch. Effects on electrical discharge rates and rhythm of this pacemaker were observed. Repetitive stretch of a few millimeters (20-40% increase in length) caused acceleration ...
Lerner R M RM College of Human Development, Pennsylvania State University, 16802, University Park, - - 1976
Middle adolescent White children (N=101, mean age 17.0 years) were subjects in a study assessing the comparability of racial attitudes as measured through the use of various response formats. Attitudes toward White and Black racial stimuli, respectively, were assessed through responses to (1) a traditional, forced-choice format; (2) a dimensionalized, ...
Stiles R N - - 1976
Spectral analysis was performed on postural hand tremor records obtained from 22 parkinsonian subjects. Of these 22 subjects, 18 had postural hand tremor that occurred primarily at a single frequency during any one 16-s period. In general, this tremor occurred at different steady-state frequencies (each calculated over 16 s) between ...
Stiles R N - - 1976
Spectral analysis of hand tremor records obtained from normal subjects during continuous extension of the hand for 15-45 min revealed that the root-mean-square (rms) displacement amplitude of the tremor increased from control levels of about 30 mum to levels on the order of 100-1,000 times control. Associated with this increase ...
Blizard D A - - 1975
The purpose of this experiment was to test whether suggestions of imagery of the type used in autogenic training have specific effects on autonomic responses. In order to control for the effort involved in imagery and to determine the specificity of the effect, opposite types of imagery were used: (a) ...
Tyrer P J - - 1975
Pysiological tremor was measured in 14 pairs of monozygotic twins, 14 pairs of dizygotic twins, and 14 pairs of control subjects matched for age and sex. Postural finger tremor was measured in each pair using a sub-miniature accelerometer and subjecting the amplified signals to power spectral analysis. Significant genetical influences ...
Richard Simon J - - 1975
Subjects responded to the onset of a red or green stimulus light by pressing a key. In a simple reaction time (RT) block, they responded to the light onset without regard to its color. In a choice RT block, they pressed a left or right key depending on the stimulus ...
Chess G F - - 1975
Spectral analysis was used to investigate variations of heart period in 13 decerebrate cats under different conditions of neural input to the heart. Spectral density plots in intact animals showed three well-defined peaks: P1 (1.5-2.5 cycles/min), P2 (6-10 cycles/min), and P2 (respiratory frequency). In the presence of sympathetic input only ...
Joyce G C - - 1974
1. Spontaneous flexion-extension tremor of the elbow was recorded in normal human subjects while they exerted a flexing force against different loads.2. Increases in the flexing force up to (1/2) or (3/4) of the subject's maximum were accompanied by increases in the amplitude of the tremor. A further increase to ...
Loockerman W D - - 1973
College males (N=150) were tested to determine the difference between the open and closed foot stance for RT and MT in various directions and under simple and choice stimulus conditions. Differences were found between the two foot stances depending upon the direction and type of stimulus employed. The results are ...
Megaw E D - - 1972
In 3 experiments, Ss controlled a horizontal lever to track a step input where the degrees of choice of direction and extent of movement were varied systematically. The experiments differed in the way the trials were presented and in the conditions under which these 2 sources of response choice were ...
Loockerman W D - - 1972
The degree of generality between forward, backward, left, and right directions was determined for RT and MT of the dominant hand and total body under choice stimulus conditions. Among 50 Ss, generality of directions for RT of the hand varied from 39 to 52%, while MT varied from 14 to ...
Lippold O C - - 1970
1. A brief downward, stepwise displacement applied to the outstretched finger gives rise to a train of approximately sinusoidal movements of it, lasting often more than 1 sec. The frequency of these waves is the same, in any one subject, as that of physiological tremor.2. The oscillations are regular in ...
Wang Shouyan - - 2005
The assessment of the extent of involvement of the distal and proximal joints in a complex arm tremor is important clinically, as tremor generated around the distal and proximal arm joints can be differentially alleviated by surgical intervention to the thalamic and subthalamic targets, respectively. We observed that the tremor ...
Sutton G G - - 1967
1. When a subject attempts to exert a steady pressure on a joystick he makes small unavoidable errors which, irrespective of their origin or frequency, may be called tremor.2. Frequency analysis shows that low frequencies always contribute much more to the total error than high frequencies. If the subject is ...
Rinehart J S - - 1965
Several types of earth tremors that could be associated with the eruption cycle of Old Faithful Geyser were registered by a seismograph placed a few meters from the geyser's orifice. Each tremor type was indicative of a specific geyser action. A totally unexpected result was an observed bimodal distribution in ...
Crozier W J - - 1927
The frequencies of pulsation of the "accessory hearts" in the isolated swimming-legs of Notonecta were studied in relation to temperature, with the idea that in such organs central nervous control is impossible, and that in an isolated system irreversibly proceeding toward death it might be expected that further evidence would ...
Meara F S - - 1912
FROM A STUDY OF THE ACCOMPANYING TRACINGS WE MAY CONCLUDE THAT: 1. The delicate mechanism of the micrograph registers the movements in the heart and blood-vessels more accurately than does the polygraph. 2. The inertia of the polygraph lever and diaphragm distorts the tracing. The difference between the results obtained ...
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