Modern psychologists agree that we have to refer to mental states Because mental processes cannot be observed so we have to study mental processes indirectly and realize that they have visible consequences despite being invisible processes.
Mental state, or mental property, is a state of mind of a person. Mental states include a diverse class that includes perceptions, painful experiences, beliefs, desires, intentions, emotions, and memory. There is controversy regarding the exact definition of this term.
It makes no sense to define mental states as brain activity because all mental states, from sensations to emotions and imagination; produces some degree of sensation, but this cannot be assumed to be so, related to brain activities such as neuronal activation, electrochemical impulses, etc.
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