Auditory spatial deficits following hemispheric lesions: dissociation of explicit and implicit processing

Area of Science:

• Neuroscience
• Auditory Perception
• Clinical Neurology

Background:

• Auditory spatial deficits are common following hemispheric brain damage.
• Previous research suggested explicit sound localization may be impaired while implicit auditory cue use is preserved.

Purpose of the Study:

• To systematically assess auditory spatial functions in patients with first hemispheric lesions.
• To investigate the dissociation between explicit and implicit use of auditory spatial cues.

Main Methods:

• Systematic assessment of auditory spatial functions in patients with first hemispheric lesions.
• Evaluation of explicit sound localization abilities.
• Evaluation of implicit use of auditory cues for sound segregation in noise.

Main Results:

• Explicit and/or implicit auditory spatial use can be disturbed after hemispheric damage.
• Dissociations between impaired explicit and preserved implicit auditory spatial use are frequent.
• Specific sound localization deficits can coexist with preserved implicit auditory spatial use.

Conclusions:

• The explicit-implicit dissociation in auditory spatial processing may reflect dual-stream auditory pathways.
• Systematic auditory spatial function assessments are crucial in clinical practice, particularly for environmental adaptation.
• Further research is needed to link these deficits to daily life disabilities and inform rehabilitation strategies.