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Mental operations
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<p>Mental operations are operations that affect <a href="/facts/Mind/Y5JhtFj4">mental</a> contents. Initially, operations of <a href="/facts/Reasoning/tcBImN8J">reasoning</a> have been the object of <a href="/facts/Logic/8JnpJLtt">logic</a> alone. <a href="/facts/Pierre_Janet/2CJFVh4k">Pierre Janet</a> was one of the first to use the concept in psychology. Mental operations have been investigated at a developmental level by <a href="/facts/Jean_Piaget/gQQBtbCU">Jean Piaget</a>, and from a <a href="/facts/Psychometric/56X26MDI">psychometric</a> perspective by <a href="/facts/J._P._Guilford/oTthHjpK">J. P. Guilford</a>. There is also a cognitive approach to the subject, as well as a systems view of it. </p>