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PubMed · 1992272

Sinusoidal harmonic acceleration testing in normal humans.

C W Li·R E Hooper·V C Cousins
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Abstract

Forty-one normal humans were tested with sinusoidal harmonic acceleration. Phase lag at 0.01, 0.02, and 0.04 Hz was the most stable parameter, with less test-retest variability than gain and asymmetry. There was no significant difference between men and women for phase lag, gain, or asymmetry at any of the five testing frequencies. Gain decreased as age increased. Age had no effect on phase lag at most test frequencies or on asymmetry at any frequency.

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AccelerationAdultAge FactorsAgedElectrooculographyEye MovementsFemaleHumansMaleMiddle AgedReaction TimeReference ValuesReflex, Vestibulo-OcularJournal ArticleResearch Support, Non-U.S. Gov't

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C W Li, R E Hooper, V C Cousins. 1991. Sinusoidal harmonic acceleration testing in normal humans.. https://doi.org/10.1288/00005537-199102000-00016

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Kinematic studies have indicated that when a subject reaches to grasp an object, the movement consists of two primary components: (a) a transport phase whereby the hand is brought towards the object and (b) a grip phase whereby the hand changes shape in anticipation of the grasp. Using a visual perturbation paradigm, we investigated the effect of different grip component strategies upon the transport phase. The distal strategy was determined by the size of the object to be grasped: for the small object (1.5 cm o.d.) subjects naturally adopted a precision grip between the index finger and thumb; for the large object (6 cm o.d.) subjects used a whole hand prehensile grip. During 20% of the reaching trials the perturbation was introduced by unexpectedly changing the object size. The results showed that corrections to the distal program in response to the perturbation were preceded by changes in the deceleration phase of the proximal component. The data supported previous findings of two visuo-motor channels for this prehensile movement but indicated that when unanticipated shifts of only the distal program are required, both channels show modifications.

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