Difference between verbal and nonverbal tests of intelligence
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Answer:
As I see it, non-verbal mental age and verbal mental age refer to two different types of one's intelligence. Whereas the latter has to do with one 's ability to master all that is related to language (e.g., spelling, grammar, semantics, and the like), the former has to do with one's ability to perform certain behaviors, such as to solve a mathematical or logical problem. Note that both WAIS and WISC allows us to determine an verbal IQ and a performance IQ.
Although distinct, these two abilities are intertwined. Suffice it to say that one's proficiency in an given language involves a set of overt behaviors, and that it is often the case that one's private speech lies at the heart of an overt behavior (e.g., to solve aloud a mathematical problem). Self-instructions are a typical procedure to solve everyday problems.
I hope that I have provided you with some hints on the difference (and resemblances) between verbal-mental age and non-verbal mental age.
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