Acquisition of verbal associations to olfactory stimuli of varying familiarity and to abstract visual stimuli.

Two paired-associate (PA) learning studies observed the acquisition performance of 85 college students with either odors or abstract figures as stimuli and numbers as responses. In both studies visual PA acquisition was reliably superior to olfactory learning. Since the second study was designed to maximize the learning of associations to the odors and minimize the learning of associations to the figures, it appears that the sense of smell is not as well suited to the PA task as vision when essentially naive subjects are involved. In a third experiment, the familiarity of odors and figures was judged and reported as a graphic magnitude estimation response. These judged stimulus familiarities were used to select stimuli for the PA task. Subsequently, PA acquisition was facilitated by the use of highly familiar odors.     

Emotional conditioning to masked stimuli and modulation of visuospatial attention

Two studies investigated the effects of conditioning to masked stimuli on visuospatial attention. During the conditioning phase, masked snakes and spiders were paired with a burst of white noise, or paired with an innocuous tone, in the conditioned stimulus (CS)+ and CS- conditions, respectively. Attentional allocation to the CSs was then assessed with a visual probe task, in which the CSs were presented unmasked (Experiment 1) or both unmasked and masked (Experiment 2), together with fear-irrelevant control stimuli (flowers and mushrooms). In Experiment 1, participants preferentially allocated attention to CS+ relative to control stimuli. Experiment 2 suggested that this attentional bias depended on the perceived aversiveness of the unconditioned stimulus and did not require conscious recognition of the CSs during both acquisition and expression.     

Cross-modal effects of subliminal verbal stimuli

Abstract.— In a cross-modal version of an experiment by Smith et al. (1959), the effects of subliminal auditory cue words upon judgements of a supraliminal visual stimulus (a neutral face), were examined. Support was found for the hypothesis that material in an unattended channel is fully analysed for meaning, and may be integrated with material in an attended channel when it is relevant to the ongoing task. Contrary to expectations, the effects of the subliminal cues were found to carry over to trials on which the face was presented without concurrent auditory stimulation, thus providing support for the Poetzl phenomenon.