The influence of dichotical fusion on the redundant signals effect, localization performance, and the mismatch negativity.
In two experiments, each including a simple reaction time (RT) task, a localization task, and a passive oddball paradigm, the physical similarity between two dichotically presented auditory stimuli was manipulated. In both experiments, a redundant signals effect (RSE), high localization performance, and a reliable mismatch negativity (MMN) was observed for largely differing stimuli, suggesting that these are coded separately in auditory memory. In contrast, no RSE and a localization rate close to chance level (experiment 1) or at chance (experiment 2) were observed for stimuli differing to a lesser degree. Crucially, for such stimuli a small (experiment 1) or no (experiment 2) MMN were observed. These MMN results indicate that such stimuli tend to fuse into a single percept and that this fusion occurs rather early within information processing.
Cognitive and Biological Psychology, University of Tübingen, Tübingen, Germany. anja.fiedler@uni-tuebingen.de
Anja
A
Fiedler
Hannes
H
Schröter
Verena C
VC
Seibold
Rolf
R
Ulrich
D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D000704:Analysis of Variance; D001288:Attention / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology*; D003265:Contingent Negative Variation / Q000502:physiology*; D004007:Dichotic Listening Tests / Q000379:methods; D004569:Electroencephalography / Q000379:methods; D004585:Electrooculography / Q000379:methods; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011571:Psychoacoustics; D011930:Reaction Time / Q000502:physiology; D055815:Young Adult
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