According to the physiological perspective, what must psychologists focus on in order to fully understand behaviour?

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The physiological perspective emphasizes the interrelations among the mind, body, and behaviour, suggesting that psychologists must focus on the physical and biological processes that underlie behaviour in order to fully understand it. Internal mental events, the adaptive value of behaviour, and the role of the unconscious may be relevant to understanding behaviour from other perspectives, but they are not the primary focus of the physiological perspective.

According to the Physiological Perspective, What Must Psychologists Focus on in Order