Who believed that we have no reason to postulate the existence of any external physical reality, and that all that exists are the mental sensations and ideas that we experience and the minds in which we experience them?

John Locke

Explanation:

John Locke was a British philosopher, who was born in 1632 and died in 1704.

He believes that “all ideas come from sensation and reflection” and that all knowledge is founded on experience and argues that the human mind doesn't have innate, intuitive ideas, but much rather humans are born with reasoning.

This is different from other scientists that believed in dualism.

In conclusion, John Locke claimed that the mind is in a blank state at birth and believed that knowledge is gained through experience.

answer; i believe its called ; checks   and balances;

answer: musical connotation

leonard b. meyer (1918-2007) was an american composer, author and philosopher. his work emotion and meaning in music is perhaps the first major treatise on music. it is a philosophical and psychological work, greatly influenced by koffka (one of the major proponents of gestalt psychology). his work deals with the problem of musical meaning and musical communication.