orthokinesisn.
/ˌɔːθəʊkᵻˈniːsɪs/, /ˌɔːθəʊkʌɪˈniːsɪs/, U.S. /ˈˌɔrθoʊkəˈnisᵻs/, /ˈˌɔrθoʊˌkaɪˈnisᵻs/ Biology.
A variation in the speed of random (non-oriented) movement of an organism or cell in response to the intensity of a stimulus. Cf. kinesis n. 2.
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orthokinesis1937
1937 D. L. Gunn et al. in Nature 18 Dec. 1064/2 Variations in generalized, undirected, random locomotory activity due to variations in intensity of stimulation are kineses... We propose to divide kineses into (a) ortho-kineses (ορθος—direct, forward)—variations in linear velocity (previously called simply kineses), and (b) klino-kineses (κλινειν—to deviate)—variations in angular velocity.
1940 G. S. Fraenkel & D. L. Gunn Orientation of Animals ii. ii. 17 Woodlice aggregate in moist air..by means of an ortho-kinesis.
1971 J. D. Carthy in J. E. Smith et al. Invertebr. Panorama xii. 251 This behaviour, consisting of changing rates of movement with different levels of stimulation, is known as an orthokinesis.
1992 Med. & Vet. Entomol. 6 100/2 The decrease in linear velocity [of the flight of screwworm flies] could have been a direct effect of the increase in sinuosity rather than a genuine ortho-kinesis.
1995 SIAM Jrnl. Appl. Math. 55 1421 Finally, orthokinesis and klinokinesis result from a dependence of cell speed and random turning behavior, respectively, on the magnitude of the ligand concentration.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).
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n.1937