<unk>  is a technical term used in classical conditioning to refer to the observation that a familiar stimulus takes longer to acquire meaning (as a signal or conditioned stimulus) than a new stimulus. The term<unk> " dates back to Lubow and Moore. The<unk>  effect is<unk> " in that it is not exhibited in the stimulus pre-exposure phase, but rather in the subsequent test phase.<unk> ", here, simply connotes that the effect is expressed in terms of relatively poor learning. The<unk>  effect is extremely robust, appearing in both invertebrate (e.g. honey bees) and mammalian species that have been tested and across many different learning paradigms, thereby suggesting some adaptive advantages, such as protecting the organism from associating irrelevant stimuli with other, more important, events.
Latent inhibition
Threshold expression
Affective spectrum
Dominance 
Variolation
Orgastic potency
Concept creep
Rebound effect