Chimp sounds trigger a strange brain signal in humans
The human brain is not limited to recognizing speech from other people. Researchers at the University of Geneva (UNIGE) have found that specific parts of the auditory cortex react strongly to the vocalizations of chimpanzees. These primates are our closest relatives both in evolutionary terms and in the acoustic qualities of their calls. The study, published in the journal eLife, points to the presence of specialized subregions in the human brain that are particularly responsive to the sounds made by certain primate species.
This discovery offers new insight into how voice recognition originated and may help explain how language later developed.
The human voice plays a crucial role in social interaction, and a large portion of the auditory cortex is devoted to processing it. Scientists have long wondered whether this ability emerged only recently or whether it has much deeper evolutionary origins. To explore this question, researchers from UNIGE’s Faculty of Psychology and Educational Sciences examined vocal communication through an evolutionary lens.
By comparing how the human brain processes vocalizations from closely related species, including chimpanzees, bonobos, and macaques, scientists can identify which neural traits humans share with other primates and which are unique. This approach helps reveal how the neural foundations of vocal communication began to form well before spoken language appeared. [Continue reading…]