The stage of incubation is often ended by a rapid insight or series of insights. These produce the "Aha!" experience, often depicted in cartoons as a light bulb appearing over the thinker's head. [Coon, Dennis. Introduction to Psychology, Exploration and Application. St. Paul: West Publishing Company, 1989. Chapter: Learning & Cognition]
R E F E R E N C E S
1 Illuminate adj [15c] 1 archaic: brightened with light 2 archaic: intellectually or spiritually enightened
2 Illuminate vt [ME fr. L illuminatus, pp. of illuminare, fr. in- + luminare to light up, fr. lumin-, lumen light - more at Luminary] [15c] 1a: to enlighten spiritually or intellectually b : to supply or brighten with light : to make luminous or shining c: archaic: to set a light d: to subject to radiation 2: to make clear: Elucidate 3: to make illustrious or resplendent 4: to decorate [as a manuscript] with gold or silver or brilliant colors or with often elaborate designs or miniature pictures
3 Illuminate n  archaic: one having or claiming unusual enlightenment
Illumination n [14c] 1: the action of illuminating or state of being illuminated: as a: spiritual or intellectual enlightenment b : a lighting up : decorative lighting or lighting effects c: decoration by the art of illuminating 2: the luminous flux per unit area on an intercepting surface at any given point 3: one of the decorative features used in the art of illuminating or in decorative lighting
[Merriam-Webster's Collegiate Dictionary, 10th Edition. Springfield, MA, USA: Merriam-Webster, Inc. 1995.]
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