Contralateral efferent-mediated processing can spatially segregate concurrent speech sources by ear

Evidence

It is important to briefly comment on the contribution of the dorsal (“spatial”) pathway to auditory perception (Rauschecker 2012 ; Cloutman 2013 ). Spatial information can act as a grouping cue to assist the segregation of an acoustic stimulus into discrete sounds. For example, when a rhythmic sequence of identical sound bursts is presented from a single location, it is often perceived as one source. But, when the sound sequence is presented from two different locations, it can be perceived as two sounds (Middlebrooks and Onsan 2012 ; Middlebrooks and Bremen 2013 ). Such findings suggest that a mixture of spatial and non-spatial auditory cues from both the dorsal and ventral pathways may be needed in order to create a coherent auditory-perceptual representation that guides behavior. — Dijk, Pim van, Physiology, Psychoacoustics and…, 4883 (#expands, via linked claim)

Categorization

• XREF: connects to: Contralateral efferent inhibition amplifies interaural level differences; MOC-related gain control enhances spatial segregation of competing speakers; Contralateral efferent inhibition of compression amplifies inter-aural level differences (+10 more)

Related

• Spatial location cues alone can segregate identical sounds into separate perceived sources (similarity 0.90)
• Contralateral dominance weakens at cortical stages due to commissural connections (similarity 0.87)
• Contralateral efferent inhibition amplifies interaural level differences (similarity 0.86)
• Contralateral stimuli explain auditory brain activity better than ipsilateral ones (similarity 0.86)
• Contralateral efferent inhibition of compression amplifies inter-aural level differences (similarity 0.86)
• Contralateral ear dominance weakens higher in the auditory pathway (similarity 0.85)
• Listeners segregate mixed sounds into separate sources using many cues (similarity 0.84)
• Spatial separation can split identical sound sequences into percepts of distinct sources (similarity 0.84)
• Sound source location alone can split one acoustic stream into two perceived sources (similarity 0.83)
• Coherent auditory perception requires both dorsal spatial and ventral identity processing (similarity 0.83)
• The ear achieves spatial hearing through signal analysis rather than directional receptors (similarity 0.83)
• Cortical responses to sound are stronger from the opposite ear than the same-side ear (similarity 0.83)
• Contralateral efferent inhibition is proportional to output energy, magnifying inter-aural differences. (similarity 0.81)
• Stronger contralateral sound causes greater efferent inhibition and more linear cochlear response (similarity 0.80)
• Lateralization weakens up the auditory pathway as interhemispheric connections dominate (similarity 0.80)

Broader Connections

• Spatial location cues alone can segregate identical sounds into separate perceived sources #expands (0.80) — Dijk, Pim van, Physiology, Psychoacoustics and…, 4883
• Contralateral stimuli explain auditory brain activity better than ipsilateral ones #expands (0.78)
• Head separation between ears produces arrival-time and intensity cues for direction #expands (0.75)
• The brain modulates spatial-hearing responses into a steady-state following response to periodic IPD switches #responds-to (0.72)
• Cortical intensity encoding becomes ear-independent through strong interhemispheric connections #complicates (0.72)