Non-directional orienting reactions in the presence of a particular sensory stimulus. Animals which suddenly find themselves in an unfavorable environment (e.g. with regard to humidity, temperature, or salt concentration) may change direction by trial and error. By such a method paramecia or woodlice become hedged in an area with favorable environmental conditions, see Homing, Navigation, Orientation, Piloting, Taxis
a movement that is a response to a stimulus but is not oriented with respect to the source of stimulation
a change in the rate of activity, or frequency of turning of an organism in the presence of a stimulus
a feverish movement of disintegration and disorder (Thucydides)
Movements by an organism in random directions in response to stimulus.
induction of movement in an animal where the movement lacks directional orientation and depends on the stimulus intensity producing a change of rate of random movements.