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| | Mental Evolution |
 | | "Romanes had taken upon himself the task of elucidating a theory of mental development in which the genesis of mind is to be traced from non-mental elements, i.e., from instinct and reflex action and, indeed, from physiology itself. |
 | | Although Romanes adopted Darwin's threefold classification of reflex action, instinct, and intelligence (or reason), these were now understood as forming an evolutionary series, and, equally important, reflex action and instinct were no longer considered as part of the mental, i.e., mind. |
 | | According to Romanes, the physiological function underlying this development, was selective excitability or the power of discriminating between different kinds of stimuli. |
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