Perkins, D.R., Dougher, M.J. & Greenway, D.E. (2007).
Contextual control by function and form of transfer of functions.
Journal of the Experimental Analysis of Behavior, 88, 87-102.
This study investigated conditions leading to contextual control by stimulus topography over transfer of functions.
Three 4-member stimulus equivalence classes, each consisting of four (A, B, C, D) topographically distinct visual
stimuli, were established for 5 college students. Across classes, designated A stimuli were open-ended linear
figures, B stimuli were circular, C stimuli three-sided, and D stimuli four-sided. Three different computer
tasks then were trained with the B stimuli. Differential reinforcement and punishment procedures were then used
to establish control over function transfer by the topography of the class members. For Task 1, function
transfer, responding to C and D stimuli as subjects had to B stimuli, was reinforced. For Task 2, function
transfer was reinforced for C stimuli but punished for D stimuli. For Task 3, function transfer was punished
for both C and D stimuli. New equivalence classes were then established and tests for generalized contextual
control were presented. All 5 subjects showed generalized contextual control of transfer of functions by
stimulus topography. Implications of contextual control over function transfer in natural settings are discussed.
Key words: stimulus equivalence, transformation of function, transfer of function, contextual control,
stimulus topography, button press, humans