Sound generation in zebrafish with Bio-Opto-Acoustics

Area of Science:

• Neuroscience
• Bioacoustics
• Sensory Biology

Background:

• Hearing is vital for underwater survival and communication.
• Current methods for studying auditory organs lack precise control over specific organ stimulation.
• Previous research relied on lesion experiments, limiting understanding of organ-specific sensitivity and integration.

Purpose of the Study:

• To introduce and validate Bio-Opto-Acoustic (BOA) stimulation for precise in vivo auditory organ control.
• To investigate the functional contributions and integration of individual otolith organs in zebrafish hearing.
• To map brain-wide neural activity in response to targeted otolith stimulation.

Main Methods:

• Utilized a rapidly oscillated optical trap for localized, in vivo vibration generation in otolith organs.
• Applied BOA stimulation to individual otoliths, with adjacent organs either unstimulated or stimulated by a second trap.
• Monitored brain-wide neural activity using fluorescent calcium indicators in zebrafish larvae.

Main Results:

• Demonstrated precise, localized stimulation of otolith organs using BOA, perceived as sound by the organism.
• Successfully mapped distinct neuronal networks associated with individual otolith organs.
• Revealed evidence of integration and cooperation between the utricular and saccular otoliths during auditory perception.

Conclusions:

• BOA stimulation offers unprecedented control for studying auditory systems in vivo.
• The utricular and saccular otoliths, previously thought to have separate functions, cooperate in auditory processing.
• This study advances our understanding of underwater hearing mechanisms and sensory integration.