Glossary I

Illumination refers to an intermediate stage in problem solving in which the individual gains insight or discovers a potential solution to a problem

Illumination edge is defined as the border between two (2) areas created by different light intensities in the two (2) areas.

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Illusion refers to an abnormal perception caused by a sensory misinterpretation of and actual stimulus, sometimes precipitated by strong emotion, e.g.

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Illusion of control refers to a bias that occurs when people overestimate the co-variation between their actions and environmental outcomes. So, Illusion of control is defined as perception of uncontrollable events as subject to one's control or as more controllable than they are.

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illusion of group productivity refers to the tendency for members to believe that their groups are performing effectively.

Illusion of incompetence refers to illusions expressed by children who perform well in academic achievement tests yet perceive themselves as below average in academic ability and behave in accordance with this perception.

Illusion of invulnerability refers to adolescents’ belief that misfortunes cannot happen to them

Illusion of Knowing refers to an inaccurate over-confidence about one's knowledge and understanding.

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