Neurophysiological evidence for context-dependent encoding of sensory input in human auditory cortex

Sussman, Elyse; Steinschneider, Mitchell

doi:10.1016/j.brainres.2005.12.074

Cited by 57 publications

(80 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It exhibited the pattern of a contrast effect: that is, an increase in similarity led to a higher probability of perceiving 'Integration' than when the same level of similarity had been experienced all along; and likewise, a decrease in similarity led to a higher probability of perceiving 'Segregation'. This contrast effect might be surprising in view of priming studies that use the system's tendency to retain the previously dominant percept in spite of parameter changes (Sussman and Steinschneider 2006;Rahne and Sussman 2009). It is, however, consistent with recent observations by Snyder and colleagues (2009a;2009b), who showed that changes in frequency similarity can lead to either priming or contrast effects depending on the time-scales over which the change and subsequent perceptual evaluations take place (see also Rogers and Bregman 1993).…”

Section: Discussionsupporting

confidence: 67%

Different roles of similarity and predictability in auditory stream segregation

Bendixen¹,

Bőhm²,

Szalárdy³

et al. 2013

Learning & Perception

View full text Add to dashboard Cite

Sound sources often emit trains of discrete sounds, such as a series of footsteps. Previously, two different principles have been suggested for how the human auditory system binds discrete sounds together into perceptual units. The feature similarity principle is based on linking sounds with similar characteristics over time. The predictability principle is based on linking sounds that follow each other in a predictable manner. The present study compared the effects of these two principles. Participants were presented with tone sequences and instructed to continuously indicate whether they perceived a single coherent sequence or two concurrent streams of sound. We investigated the influence of separate manipulations of similarity and predictability on these perceptual reports. Both grouping principles affected perception of the tone sequences, albeit with different characteristics. In particular, results suggest that whereas predictability is only analyzed for the currently perceived sound organization, feature similarity is also analyzed for alternative groupings of sound. Moreover, changing similarity or predictability within an ongoing sound sequence led to markedly different dynamic effects. Taken together, these results provide evidence for different roles of similarity and predictability in auditory scene analysis, suggesting that forming auditory stream representations and competition between alternatives rely on partly different processes.

show abstract

Section: Discussionsupporting

confidence: 67%

Different roles of similarity and predictability in auditory stream segregation

Bendixen¹,

Bőhm²,

Szalárdy³

et al. 2013

Learning & Perception

View full text Add to dashboard Cite

show abstract

“…The regularities stored in memory provide the auditory context from which deviance detection takes place. Thus, the representation of sounds in memory (e.g., as one or two streams) forms the basis for evaluating incoming sound information (Sussman, 2005;Sussman and Steinschneider, 2006). Deviance detection is determined on the basis of the stored regularities.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, MMN can be used to determine which regularities (individual features or pattern of sounds) are represented in sensory memory at the time the 'deviant' occurs. In this way, MMN can be used to evaluate the representation of the organization of a set of sounds as integrated or segregated (e.g., Müller et al, 2005;Ritter et al, 2006;Sussman et al, 1999Sussman et al, ,2005Sussman and Steinschneider, 2006;Yabe et al, 2001). …”

Section: Introductionmentioning

confidence: 99%

Visual cues can modulate integration and segregation of objects in auditory scene analysis

et al. 2007

View full text Add to dashboard Cite

The task of assigning concurrent sounds to different auditory objects is known to depend on temporal and spectral cues. When tones of high and low frequencies are presented in alternation, they can be perceived as a single, integrated melody, or as two parallel, segregated melodic lines, according to the presentation rate and frequency distance between the sounds. At an intermediate distance, in the 'ambiguous' range, both percepts are possible. We conducted an electrophysiological experiment to determine whether an ambiguous sound organization could be modulated toward an integrated or segregated percept by the synchronous presentation of visual cues. Two sets of sounds (one high frequency and one low frequency) were interleaved. To promote integration or segregation, visual stimuli were synchronized to either the within-set frequency pattern or to the across-set intensity pattern. Elicitation of the mismatch negativity (MMN) component of event-related brain potentials was used to index the segregated organization, when no task was performed with the sounds. MMN was elicited only when the visual pattern promoted the segregation of the sounds. The results demonstrate cross-modal effects on auditory object perception in that sound ambiguity was resolved by synchronous presentation of visual stimuli, which promoted either an integrated or segregated perception of the sounds.

show abstract

“…The zeitgeist seems to be increasingly shifting from the concept of the primary auditory cortex as primarily a sensory processing structure to one that is cognitive in nature, albeit specializing in acoustic processing and hearing (e.g., King, 2006;Sussman and Steinschneider, 2006). Research that expands the domain of inquiry about the auditory cortex will undoubtedly substantially increase complexity and perhaps confusion.…”

Section: Discussionmentioning

confidence: 99%

Auditory associative memory and representational plasticity in the primary auditory cortex

2007

View full text Add to dashboard Cite

Historically, the primary auditory cortex has been largely ignored as a substrate of auditory memory, perhaps because studies of associative learning could not reveal the plasticity of receptive fields (RFs). The use of a unified experimental design, in which RFs are obtained before and after standard training (e.g., classical and instrumental conditioning) revealed associative representational plasticity, characterized by facilitation of responses to tonal conditioned stimuli (CSs) at the expense of other frequencies, producing CS-specific tuning shifts. Associative representational plasticity (ARP) possesses the major attributes of associative memory: it is highly specific, discriminative, rapidly acquired, consolidates over hours and days and can be retained indefinitely. The nucleus basalis cholinergic system is sufficient both for the induction of ARP and for the induction of specific auditory memory, including control of the amount of remembered acoustic details. Extant controversies regarding the form, function and neural substrates of ARP appear largely to reflect different assumptions, which are explicitly discussed. The view that the forms of plasticity are taskdependent is supported by ongoing studies in which auditory learning involves CS-specific decreases in threshold or bandwidth without affecting frequency tuning. Future research needs to focus on the factors that determine ARP and their functions in hearing and in auditory memory.

show abstract

Neurophysiological evidence for context-dependent encoding of sensory input in human auditory cortex

Cited by 57 publications

References 67 publications

Different roles of similarity and predictability in auditory stream segregation

Different roles of similarity and predictability in auditory stream segregation

Visual cues can modulate integration and segregation of objects in auditory scene analysis

Auditory associative memory and representational plasticity in the primary auditory cortex

Contact Info

Product

Resources

About