The development of psychophysical methods and reaction-time experiments at the end of the 19^th century was important to the emerging field of psychology because these methods A) were instrumental in the development of behaviorism in the 20^th century. B) helped psychology to become a quantifiable, laboratory-based science. C) formed a foundation for the work of Sigmund Freud. D) allowed researchers to provide information to the public about mental telepathy and clairvoyance.

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Psychophysical methods and reaction-time experiments allowed for the quantification and measurement of psychological processes, paving the way for psychology to become a more rigorous, laboratory-based science. This was especially important for the emerging field of experimental psychology at the end of the 19th century. While these methods may have been used in later behaviorist and psychoanalytic research, they were not instrumental in their development. Similarly, these methods were not used to investigate or provide evidence for mental telepathy or clairvoyance.

The Development of Psychophysical Methods and Reaction-Time Experiments at the End