Watson faulted introspection on three grounds. One of which was:

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Watson faulted introspection on practical, empirical, and philosophical grounds. Practically, he argued that introspection is unreliable and cannot be standardized due to individual differences in subjective experience. Empirically, he claimed that introspection does not allow for scientific investigation because private inner experiences cannot be observed or measured. Philosophically, he contended that introspection is based on flawed assumptions about the nature of consciousness and the self.

Watson Faulted Introspection on Three Grounds