Es. Funayama et al., COMPOUND CONDITIONING IN HONEYBEES - BLOCKING TESTS OF THE INDEPENDENCE ASSUMPTION, Animal learning & behavior, 23(4), 1995, pp. 429-437
Six experiments with color-odor compounds failed to produce convincing
evidence of blocking in honeybees even when the possibility of maskin
g by within-compound association could be discounted. The parsimonious
assumption that the components of a compound stimulus gain and lose a
ssociative strength independently with reinforcement and nonreinforcem
ent of the compounds (which the experiments were designed to challenge
) remains tenable for color-odor compounds, although perhaps not for i
ntramodal compounds.