Extrinsic embryonic sensory stimulation alters multimodal behavior and cellular activation

Area of Science:

• Neuroscience
• Developmental Biology
• Sensory Systems

Background:

• Embryonic sensory systems develop through spontaneous activity and external influences.
• The interplay between sensory and motor systems during embryogenesis is crucial for multimodal differentiation.
• The long-term effects of early sensory stimulation on brain development and behavior remain largely unexplored.

Purpose of the Study:

• To investigate how extrinsic auditory stimulation during embryogenesis affects multimodal sensory development and postnatal behavior in bobwhite quail.
• To determine if early auditory input leads to persistent changes in brain structure and function.
• To examine the receptivity of auditory-related brain regions to extrinsic input during embryonic development.

Main Methods:

• Bobwhite quail embryos received auditory stimulation at different developmental stages (early, middle, late).
• Postnatal behavioral responses to auditory and visual cues were assessed.
• Cellular activation (ZENK-immunopositive cells) in auditory and multimodal brain regions was measured.

Main Results:

• Auditory stimulation during late embryogenesis enhanced preference for conspecific auditory cues post-hatch.
• Middle and late embryonic auditory stimulation resulted in altered postnatal visual responsiveness, indicating multimodal effects.
• Increased ZENK-immunopositive cells were observed in deep optic tectum and nidopallia following embryonic auditory stimulation, suggesting enhanced cellular activation in multimodal brain areas.

Conclusions:

• Extrinsic auditory stimulation during avian embryogenesis can induce lasting changes in multimodal sensory processing and behavior.
• Early sensory experiences shape neural circuits, impacting both auditory and visual systems.
• This study provides the first evidence linking early embryonic sensory stimulation to postnatal multimodal behavioral and cellular changes.