Jt. Cacioppo et al., RUDIMENTARY DETERMINANTS OF ATTITUDES .2. ARM FLEXION AND EXTENSION HAVE DIFFERENTIAL-EFFECTS ON ATTITUDES, Journal of personality and social psychology, 65(1), 1993, pp. 5-17
In the pain-flexor reflex, arm extension is temporally coupled with th
e onset of the unconditioned aversive stimulus, whereas flexion is ass
ociated with its offset; when retrieving desirable stimuli, arm flexio
n is more closely coupled temporally to the acquisition or consumption
of the desired stimuli than arm extension. It was posited that these
contingencies foster an association between arm flexion, in contrast t
o extension, and approach motivational orientations. Six experiments w
ere conducted to examine this hypothesis. Ideographs presented during
arm flexion were subsequently ranked more positively than ideographs p
resented during arm extension, but only when the Ss' task was to evalu
ate the ideographs when they were presented initially. Arm flexion and
extension were also each found to have discernible attitudinal effect
s. These results suggest a possible role for nondeclarative memory in
attitude formation.