(physiology) the spread of sensory neural impulses in the cortex
(Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus
the apparent enlargement of a bright object when viewed against a dark background
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
Act of irradiating, or state of being irradiated.
Illumination; irradiance; brilliancy.
Fig.: mental light or illumination.
The apparent enlargement of a bright object seen upon a dark ground, due to the fact that the portions of the retina around the image are stimulated by the intense light; as when a dark spot on a white ground appears smaller, or a white spot on a dark ground larger, than it really is, esp. when a little out of focus.