The effects of test order and nodal distance on the emergence and stability of derived discriminative stimulus functions
Rehfeldt, R. A., & Dymond, S. (2005). The effects of test order and nodal distance on the emergence and stability of derived discriminative stimulus functions. Psychological Record, 55(2), 179-196.
The present study examined the effects of equivalence test order and nodal distance on the emergence and stability of derived discriminative stimulus functions. Participants in 1 group were exposed to a transfer of functions test following a symmetry and equivalence test, another group of participants completed a symmetry and equivalence test follovwing a transfer test, and a final group of participants received a symmetry test only if they failed to demonstrate immediate transfer, after which time they were retested. At least 1 month following their initial laboratory experience, all participants who had demonstrated the transfer of functions were contacted and asked to return to the laboratory for a follow-up transfer test. Results showed that a prior equivalence test was not necessary for the transfer of functions, although a symmetry test may have facilitated transfer for some participants, A nodal distance effect for the stability of the derived stimulus functions was observed during the follow-up transfer test.
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