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Biomedical subjects

J Hossack

Publications and source records attributed to J Hossack.

2 recordsLinked to original sources

Men and women holding hands: whose hand is uppermost?

This study explored the issue of whether status and power differences are expressed in the way men and women hold hands. It was hypothesized that men's hands would be upper in heterosexual handholding couples significantly more often than women's. Also, to explore the possibility that height differences of handholding partners might affect handholding position, all handholding couples observed in this study were classified as couples with men and women of equal height or couples where either the men or women were taller. A total of 1,006 handholing couples were observed, and men's hands were significantly more likely to be the upper one in couples when men were taller than women and in couples where men and women were of equal height, suggesting that, while height does matter, it is less important for this handholding pattern than sex differences.

Body Height↗

Testing ultrasonic pulsed Doppler instruments with a physiologic string phantom.

The spatial, temporal, and frequency resolution of conventional ultrasonic Doppler instruments and the time/space distortions in two-dimensional color Doppler imaging systems can be measured using a pulsatile moving string target. The diameter of the string is small compared with the Doppler sample volume, the velocity (speed and direction), acceleration and timing of the string motions are precisely known with reference to the R wave timing mark, and the spatial location of the string is known. A loop of surgical thread or monofilament fishline running between pulleys is driven by a motor that provides constant string speeds from 0.05 to 150 cm/s and variable string speeds programmed to mimic arterial velocity waveforms from the carotid, aortic, and femoral arteries. Constant string speeds are used to evaluate the Doppler sensitivity, frequency processing, and sample volume size; pulsatile movement of the string provides a physiologic model to evaluate the temporal performance of conventional Doppler systems and the temporal and spatial performance of two-dimensional color Doppler imaging scanners.

Blood Flow Velocity↗