title: Neuromechanistic Model of Auditory Bistability.
abstract: Sequences of higher frequency A and lower frequency B tones repeating in an ABA- triplet pattern are widely used to study auditory streaming. One may experience either an integrated percept, a single ABA-ABA- stream, or a segregated percept, separate but simultaneous streams A-A-A-A- and -B---B--. During minutes-long presentations, subjects may report irregular alternations between these interpretations. We combine neuromechanistic modeling and psychoacoustic experiments to study these persistent alternations and to characterize the effects of manipulating stimulus parameters. Unlike many phenomenological models with abstract, percept-specific competition and fixed inputs, our network model comprises neuronal units with sensory feature dependent inputs that mimic the pulsatile-like A1 responses to tones in the ABA- triplets. It embodies a neuronal computation for percept competition thought to occur beyond primary auditory cortex (A1). Mutual inhibition, adaptation and noise are implemented. We include slow NDMA recurrent excitation for local temporal memory that enables linkage across sound gaps from one triplet to the next. Percepts in our model are identified in the firing patterns of the neuronal units. We predict with the model that manipulations of the frequency difference between tones A and B should affect the dominance durations of the stronger percept, the one dominant a larger fraction of time, more than those of the weaker percept-a property that has been previously established and generalized across several visual bistable paradigms. We confirm the qualitative prediction with our psychoacoustic experiments and use the behavioral data to further constrain and improve the model, achieving quantitative agreement between experimental and modeling results. Our work and model provide a platform that can be extended to consider other stimulus conditions, including the effects of context and volition.
authors.affiliation: Center for Neural Science, New York University, New York, New York, United States of America.
authors.forename: James
authors.initials: J
authors.lastname: Rankin
authors.affiliation: Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York, United States of America.|Department of Otorhinolaryngology-HNS, Albert Einstein College of Medicine, Bronx, New York, United States of America.
authors.forename: Elyse
authors.initials: E
authors.lastname: Sussman
authors.affiliation: Center for Neural Science, New York University, New York, New York, United States of America.|Courant Institute of Mathematical Sciences, New York University, New York, New York, United States of America.
authors.forename: John
authors.initials: J
authors.lastname: Rinzel
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D001303:Auditory Cortex / Q000166:cytology* / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology*; D019295:Computational Biology; D005260:Female; D006801:Humans; D008297:Male; D008959:Models, Neurological; D055815:Young Adult