knee-jerk reaction. Fig. an automatic or reflex reaction; an immediate reaction made without examining causes or facts. With one of his typical knee-jerk reactions, he said no immediately, citing some moral argument that no one understood. See also: reaction.
What did you see when the patients head was rolled to the opposite side? In horizontal canal BPPV, you should have seen a direction change. When the horizontal nystagmus is geotropic, the BPPV is suspected to be canalithiasis, occurring on the side with the more intense nystagmus.
Silica distribution in Equisetum hyemale var affine in relation to the negative geotropic response. When auxins are present in the root, they act hand in hand with columel statoliths (which are sensitive to gravity), leading to positive geotropic growth (ALONI et al. Each spring, as moisture permits, the tuber produces leaves, a root, and a strobilus, and a geotropic new tuber. In posterior canal BPPV there is usually a brief latency, followed by a geotropic (beating towards the ground) verticalrotatory nystagmus lasting less than 60 seconds.