3/29/2023 0 Comments Who has better ears cats or dogs![]() ![]() ![]() Ronny Hannemann from the hearing aid manufacturer Sivantos GmbH and Steven A. The research project was conducted by researchers at the Systems Neuroscience & Neurotechnology Unit (SNNU), which is affiliated to both the Medical Faculty at Saarland University and to the School of Engineering at the University of Applied Sciences in Saarland (htw saar). A miniature processor would gauge the direction the user is trying to direct their attention towards and then adjust the gain on the device's directional microphones accordingly. The device would function in a way that reflects the user's auditory intention.' The hearing aid would almost instantaneously register and interpret the electrical activity in the ear muscles. 'These devices would be able to amplify the sounds that the wearer is trying to hear, while suppressing the noises that they are trying to ignore. One area of great practical relevance would be in developing better hearing aids. The technique is not restricted to fundamental research, it also has potential for a number of interesting applications," explains Professor Strauss. 'Our results show that electromyography of the ear muscles offers a simple means of measuring auditory attention. Depending on the type of aural stimulus used, the researchers were able to observe different upward movements of the ear as well as differences in the strength of the rearward motion of the pinna's upper-lateral edge. The subtle movements of the ears were made visible by applying computer-based motion magnification techniques. To better characterize these minute movements of the ear, the team also made special high-definition video recordings of the subjects during the experiments. Both experiments showed that muscle movements in the vestigial pinna-orienting system indicate the direction of the subject's auditory attention. To test the goal-directed attention that we show when actively listening, the participants were asked to listen to a short story coming from one laterally positioned speaker, while ignoring a 'competing' story from a speaker located on the opposite side. To assess the reflexive attention that occurs automatically when we hear unexpected sounds, the participants in the study were exposed to novel sounds coming at random intervals from different lateral positions while they silently read a monotonous text. Sensors attached to the subject's skin detected the electrical activity of the muscles responsible for moving the pinna or altering its shape. The researchers were able to record the signals that control the minute, generally invisible, movements of the pinna using a technique known as surface electromyography (EMG). The question why pinna orienting was lost during the evolution of the primate lineage has still not been completely resolved. Despite becoming vestigial about 25 million years ago, this system still exists as a "neural fossil" within our brains,' explains Professor Strauss. ![]() 'It is very likely that humans still possess a rudimentary orientation system that tries to control the movement of the pinna (the visible outer part of the ear). 'The electrical activity of the ear muscles indicates the direction in which the subject is focusing their auditory attention,' says neuroscientist and computer scientist Strauss. ![]() The research team, led by Professor Danial Strauss, has shown that the muscles around the ear become active as soon as novel, unusual or goal-relevant sounds are perceived. But the fact is, they do, as researchers at the Systems Neuroscience & Neurotechnology Unit (SNNU) have now shown. Nobody seriously thinks that kids literally move their ears the way that cats, dogs or horses do. Asking children to 'perk up their ears' means asking them to listen intently. ![]()
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