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However, it is possible that the high-frequency reversal borders also contain broadly tuned subpopulations of neurons, functioning to integrate a wide range of ultra- sonic sensory input for both the A1 and AAF. Researchers sometimes avoid probing these regions near the borders to prevent “contamination” from the accidental recording of neurons from neighboring regions (Carrasco et al., 2015). Due to this precaution, studies may fail to record from the neurons with the highest characteristic frequencies, lim- iting our understanding of the cortical representation of ultrasonic stimuli in cats and other terrestrial mammals.
Ultrasound is essential to the lives of many animals, evi- denced by the magnitude of cortical space allocated specifically for ultrasound in some species. Despite the biological importance of ultrasound, researchers might have been underestimating the ultrasonic hearing abilities of many terrestrial mammals. It is therefore also possible that the extent of the ultrasonic abilities of some terrestrial mammals, as discussed in this article, has not yet been conclusively established. Until this matter is clarified, the location in the brain where these frequencies are encoded also remains uncertain. Further investigations may elu- cidate uncertainties in our understanding of the role of ultrasonic frequencies in auditory neuroscience as a whole.
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