A computational model of echo processing and acoustic imaging in frequency-modulated echolocating bats: the spectrogram correlation and transformation receiver

Area of Science:

• Bioacoustics
• Neuroethology
• Sensory processing

Background:

• Bats use frequency modulated (FM) sonar for navigation and hunting.
• Understanding bat sonar processing is key to deciphering complex sensory systems.

Purpose of the Study:

• To present the Spectrogram Correlation and Transformation (SCAT) model for bat sonar reception.
• To explain how bats reconstruct target range and structure from echoes.

Main Methods:

• The SCAT model incorporates cochlear encoding into spectrograms.
• Two parallel pathways process temporal and spectral echo information.
• Deconvolution of spectrograms yields target impulse responses.

Main Results:

• The SCAT model accurately predicts bat perception of target range and structure.
• Model performance aligns with behavioral experiments on resolution, phase sensitivity, and noise robustness.

Conclusions:

• The SCAT model provides a computational framework for bat sonar.
• This model elucidates the neural mechanisms underlying bat's remarkable spatial hearing.