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The shape of the function relating reaction time (RT) and IQ was determined as complexity of the RT-tasks varied. At issue is whether the function is linear or U-shaped. Vernon and Weese (Personality and Individual Differences, 14, 413-419, 1993) posit a linear task complexity function; i.e. the magnitude of the correlation between RT and IQ increases as RT tasks resemble IQ tests in the demands...