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Biomedical subjects

J H Wei

Publications and source records attributed to J H Wei.

28 records · Page 2Linked to original sources
PubMed1987

Appearance of two-level CNV and extrication wave and the explanation of psychological factors of CNV.

Three paradigms of CNV were recorded on twelve subjects aged 19 to 23, as follows: (1) Usual CNV (U.CNV): warning stimulus--imperative stimulus--motor response. (2) Nonmotor Two-Level CNV (NmTL.CNV): warning stimulus--warning stimulus--weak click (random presence or absence)--discrimination. (3) Nonmotor CNV (Nm.CNV): warning stimulus--weak click (random presence or absence)--discrimination. The CNV rise, level by level, was observed. Analysis of the results of this experiment indicates that the positive wave after discrimination is essentially different from the positive-going wave after the usual CNV motor response. It is a pure, mental-related wave and is related to the extrication from mental load (EML). These phenomena suggest that the psychological factors in CNV are the increase of mental load which is synthetically composed of expectancy, conation, motivation, orientation, attention and arousal, etc., while engaging in an identical task.

Adult↗
PubMed1987

Two-level CNV and extrication wave in human brain.

In this experiment, the paradigm of CNV is changed, with two warning stimuli presented and the key press for discrimination exchanged in order to reject the motor factor in CNV. The main results are: Second level of CNV is increased, an extrication wave is discovered. Various hypotheses about CNV are discussed, proposing that the psychological factor in CNV is not a unitary one, but the increase of the mental load which is synthetically composed of many psychological factors.

Adult↗
PubMed1985

Cardiogenic motion of right lung parenchyma in anesthetized intact dogs.

Cardiogenic motion of the right lung parenchyma (CGLM) was measured in six morphine-pentobarbital-anesthetized dogs (11-16 kg) under conditions of varying paced and spontaneous sinus heart rates. Motion of 1-mm-diameter percutaneously implanted radiopaque lung parenchymal markers were measured using a computer-based biplane video-roentgenographic assembly. Correlation of the amplitudes and phases of marker motions to the R wave of the electrocardiogram (ECG) were determined utilizing a modified fast Fourier transform algorithm. Of initial importance was the observation that CGLM was significantly greater than the variability of repeated measurements. The total amplitudes of motion of the markers (where AT = square root A2X + A2Y + A2Z and AX, AY, AZ are the amplitudes of marker motion along the orthogonal X, Y, and Z body axes) in the right apical, cardiac, and diaphragmatic lobes were 0.025 +/- 0.005 (SE), 0.046 +/- 0.005, and 0.023 +/- 0.025 cm, respectively, (P less than 0.01, cardiac lobe vs. others). The total amplitude of motion observed in the cardiac lobe was equivalent to earlier observations of total amplitude (0.045 +/- 0.004 cm) of marker motion in response to high frequency airway oscillation at a pump stroke volume of 22-26 ml. An analysis of the higher harmonics of marker oscillation suggested that the second harmonic of CGLM is also larger than the variability of our measurements.

Anesthesia, Intravenous↗