Presents study results determining the effect of incentives on willingness to participate in experiments involving varying degrees of aversive treatments. Reports methods, procedures, and results for three different experiments. Concludes that willingness to participate was greater with larger incentives but lower for aversive treatments. Argues…

The undermining effect of extrinsic reward on intrinsic motivation remains unproven. The key unresolved issues are construct invalidity (all four definitions are unproved and two are illogical); measurement unreliability (the free-choice measure requires unreliable, subjective judgments to infer intrinsic motivation); inadequate experimental…

In this overview of his research in personality theory, Cattell describes the play of people, situations, and, ideas enacted over 30 years in his University of Illinois laboratory. Establishing meaningful empirical measurement methods was the foundation for further research into many aspects of personality development. (BS)