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Neural Response Selectivity to Natural Sounds in the Bat Midbrain
انتخاب پاسخ عصبی به صداهای طبیعی در بطن میانی-2020 Little is known about the neural mechanisms that mediate differential action–selection responses to
communication and echolocation calls in bats. For example, in the big brown bat, frequency modulated (FM)
food-claiming communication calls closely resemble FM echolocation calls, which guide social and orienting
behaviors, respectively. Using advanced signal processing methods, we identified fine differences in temporal
structure of these natural sounds that appear key to auditory discrimination and behavioral decisions. We
recorded extracellular potentials from single neurons in the midbrain inferior colliculus (IC) of passively listening
animals, and compared responses to playbacks of acoustic signals used by bats for social communication and
echolocation. We combined information obtained from spike number and spike triggered averages (STA) to reveal
a robust classification of neuron selectivity for communication or echolocation calls. These data highlight the
importance of temporal acoustic structure for differentiating echolocation and food-claiming social calls and
point to general mechanisms of natural sound processing across species. Key words: big brown bats | echolocation | social communication sounds | inferior colliculus |
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