22 August 2002 | Wolfgang Enard, Molly Przeworski, Simon E. Fisher, Cecilia S. L. Lai, Victor Wiebe, Takashi Kitano, Anthony P. Monaco & Svante Pääbo
The study explores the role of corollary discharge in maintaining auditory sensitivity during sound production in singing crickets. Using intracellular recordings, researchers found that presynaptic inhibition of auditory afferents and postsynaptic inhibition of an identified auditory interneuron occur in phase with the song pattern. These inhibitions persist in an isolated, fictively singing cricket's central nervous system and are attributed to a corollary discharge from the singing motor network. Injecting hyperpolarizing current to mimic inhibition in the interneuron suppresses its spiking response to a high-intensity sound stimulus but maintains its response to quieter stimuli. This inhibition reduces the neural response to self-generated sound and prevents self-induced desensitization of the auditory pathway.
Crickets produce songs by rubbing their forewings, generating sounds that can reach over 100 dB SPL. These songs consist of a series of chirps separated by intervals. Auditory afferent neurons project from the ear to the auditory neuropile of the prothoracic ganglion, where two inhibitory interneurons (ON1s) process auditory information. These interneurons are sensitive to the carrier frequency of the song. Maintaining auditory sensitivity during singing is crucial for crickets to respond behaviorally to auditory stimuli. The corollary discharge mechanism helps maintain this sensitivity by inhibiting the auditory pathway in response to self-generated sounds, preventing desensitization. This study highlights the importance of corollary discharge in auditory processing during sound production.The study explores the role of corollary discharge in maintaining auditory sensitivity during sound production in singing crickets. Using intracellular recordings, researchers found that presynaptic inhibition of auditory afferents and postsynaptic inhibition of an identified auditory interneuron occur in phase with the song pattern. These inhibitions persist in an isolated, fictively singing cricket's central nervous system and are attributed to a corollary discharge from the singing motor network. Injecting hyperpolarizing current to mimic inhibition in the interneuron suppresses its spiking response to a high-intensity sound stimulus but maintains its response to quieter stimuli. This inhibition reduces the neural response to self-generated sound and prevents self-induced desensitization of the auditory pathway.
Crickets produce songs by rubbing their forewings, generating sounds that can reach over 100 dB SPL. These songs consist of a series of chirps separated by intervals. Auditory afferent neurons project from the ear to the auditory neuropile of the prothoracic ganglion, where two inhibitory interneurons (ON1s) process auditory information. These interneurons are sensitive to the carrier frequency of the song. Maintaining auditory sensitivity during singing is crucial for crickets to respond behaviorally to auditory stimuli. The corollary discharge mechanism helps maintain this sensitivity by inhibiting the auditory pathway in response to self-generated sounds, preventing desensitization. This study highlights the importance of corollary discharge in auditory processing during sound production.