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perpendicular distance

The distance from a point to a line or plane measured along the line perpendicular to the line or plane which passes through the given point. It will be the shortest distance between the ...

waggle dance

waggle dance n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Psychology, Medicine and health, Psychiatry
Length:
263 words
Illustration(s):
1

...straight waggling run, and so on, alternating the return loops between left anticlockwise) and right (clockwise) (see illustration). The direction of the waggling run relative to the perpendicular indicates the direction of the target relative to the position of the sun, the liveliness and length of the dance, how rich the food source is; and the tempo of the dance, the distance of the food source—for example, in the giant honey-bee Apis dorsata , 40 complete figures of eight per minute indicates 15 metres, 27 per minute indicates 30 metres, and 19 per minute...

hair cell

hair cell n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

... transducer that converts kinetic energy into electrical nerve impulses. A mammalian hair cell responds along its axis of maximum sensitivity to movements of its tip of 100 picometres (trillionths of a metre, about the same distance as the diameter of some atoms), but is totally insensitive to movement along the perpendicular axis. See also Deiters’ cell , inner hair cell , outer hair cell...

Pulfrich effect

Pulfrich effect n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

...effect n . A visual illusion that is seen when a pendulum such as a length of string with a weight attached to one end is swung from side to side in a plane perpendicular to the line of vision. If it is viewed from a distance with a lens from a pair of sunglasses or a similar dark filter over one eye but with both eyes open, and with attention focused on the centre of the swing, the pendulum appears to move in an ellipse parallel to the floor, clockwise as seen from above if the dark lens is over the left eye and anticlockwise if it is covers the right...

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