Development of parallel auditory thalamocortical pathways for two different behaviors
Khaleel A Razak1, Zoltan M Fuzessery
1Department of Psychology, University of California Riverside, CA, USA.
Frontiers in Neuroanatomy
|October 14, 2010
Summary
Auditory pathways in bats segregate during development. Initially, connections overlap, but refine with experience, suggesting a critical period for auditory processing development.
Area of Science:
- Neuroscience
- Auditory System Development
- Sensory Processing
Background:
- Auditory thalamocortical connections are organized into parallel pathways from the medial geniculate body (MGB).
- The functional and developmental aspects of these pathways are not well understood.
- Pallid bats utilize passive hearing for prey detection and echolocation for navigation.
Purpose of the Study:
- To review the organization and development of auditory thalamocortical pathways in the pallid bat.
- To understand how parallel pathways for noise and echolocation processing emerge.
- To investigate the developmental trajectory of MGB-cortex connections.
Main Methods:
- Review of physiological and retrograde tracer studies in pallid bats.
- Analysis of auditory cortex organization and MGB projections.
- Examination of developmental changes in thalamocortical connectivity.
Main Results:
- Distinct MGB divisions project to segregated cortical regions for noise (MGBv) and echolocation (SG).
- During early development (2 weeks postnatal), SG projections overlap, targeting both noise and echolocation regions.
- Connections mature to adult-like segregation by 2 months postnatal.
Conclusions:
- Parallel auditory thalamocortical pathways for distinct functions (passive listening vs. echolocation) exist in pallid bats.
- These pathways segregate during postnatal development.
- Experience-dependent mechanisms may drive the refinement of these parallel pathways.
Keywords:
auditory cortexauditory developmentecholocationmedial geniculate bodyparallel pathwaysplasticitythalamocorticalMore Related Videos
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