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Unlabelled: Human infant vocal development is strongly influenced by interactions with caregivers who reinforce more speech-like sounds. This trajectory of vocal development in humans is radically different from those of our close phylogenetic relatives, Old World monkeys and apes. In these primates most closely related to humans on the evolutionary tree, social feedback plays no significant role in their vocal development.
View Article and Find Full Text PDFLaminar organization of visual responses in core and parabelt auditory cortex.
Cereb Cortex
September 2024
Center for Biomedical Imaging and Neuromodulation, Nathan Kline Institute for Psychiatric Research, 140 Old Orangeburg Rd, Orangeburg, NY 10962, United States.
Audiovisual (AV) interaction has been shown in many studies of auditory cortex. However, the underlying processes and circuits are unclear because few studies have used methods that delineate the timing and laminar distribution of net excitatory and inhibitory processes within areas, much less across cortical levels. This study examined laminar profiles of neuronal activity in auditory core (AC) and parabelt (PB) cortices recorded from macaques during active discrimination of conspecific faces and vocalizations.
View Article and Find Full Text PDFSlow and steady: auditory features for discriminating animal vocalizations.
bioRxiv
July 2024
David Rittenhouse Laboratory, Department of Physics and Astronomy, University of Pennsylvania, USA.
We propose that listeners can use temporal regularities - spectro-temporal correlations that change smoothly over time - to discriminate animal vocalizations within and between species. To test this idea, we used Slow Feature Analysis (SFA) to find the most temporally regular components of vocalizations from birds (blue jay, house finch, American yellow warbler, and great blue heron), humans (English speakers), and rhesus macaques. We projected vocalizations into the learned feature space and tested intra-class (same speaker/species) and inter-class (different speakers/species) auditory discrimination by a trained classifier.
View Article and Find Full Text PDFA population of neurons selective for human voice in the monkey brain.
Proc Natl Acad Sci U S A
June 2024
Institut de Neurosciences de la Timone, Aix-Marseille Université, UMR 7289 CNRS, Marseille 13005, France.
Many animals can extract useful information from the vocalizations of other species. Neuroimaging studies have evidenced areas sensitive to conspecific vocalizations in the cerebral cortex of primates, but how these areas process heterospecific vocalizations remains unclear. Using fMRI-guided electrophysiology, we recorded the spiking activity of individual neurons in the anterior temporal voice patches of two macaques while they listened to complex sounds including vocalizations from several species.
View Article and Find Full Text PDFCorrecting the record: Phonetic potential of primate vocal tracts and the legacy of Philip Lieberman (1934-2022).
Am J Primatol
August 2024
Speech, Music & Hearing, KTH Royal Institute of Technology, Stockholm, Sweden.
The phonetic potential of nonhuman primate vocal tracts has been the subject of considerable contention in recent literature. Here, the work of Philip Lieberman (1934-2022) is considered at length, and two research papers-both purported challenges to Lieberman's theoretical work-and a review of Lieberman's scientific legacy are critically examined. I argue that various aspects of Lieberman's research have been consistently misinterpreted in the literature.
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