Abstract
Stevens and Hyde have questioned only the empirical evidence relevant to Jensen's formulation of a genetic hypothesis to explain race and sex differences in spatial visualization ability, rather than the formulation of the hypothesisper se, which at present remains the only non-ad hoc hypothesis concerning these phenomena, which are admittedly in need of further empirical investigation. The formulation of potentially falsifiable hypotheses derived from genetic theory is the surest means for advancing knowledge in behavioral genetics.
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