Question

who promoted the insight theory of learning

Answer 1

The insight theory of learning promotes learning through a variety of ways. Sometimes it may be a cognitive thinking about solving the problem or interacting with the environment or by direct observations. It promotes deep understanding of the problem and its solution with a long lasting change. This type of learning is not just a theoritical approach to subject but creating a practical understanding of problem solving and methodology.
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Answer 2

Insight theory of learning is promoted by Gestalt theorists.

Insight theory is learning a subject by looking at it from many different ways. It's learning in deep. So we examine many aspects of the topic.