![]() ![]() Our conclusion is that extensive and inadequate usage of portable music players could cause subtle damages, which standard behavioral audiometric measures fail to detect in an early stage. However, the objective magnetoencephalographic data demonstrated that the population-level frequency tuning in the auditory cortex of the portable music player users was significantly broadened compared to the non-users, when attention was distracted from the auditory modality this group difference vanished when attention was directed to the auditory modality. Both groups performed equally and normally in standard audiological examinations (pure tone audiogram, speech test, and hearing-in-noise test). We compared two groups of young people: one group had listened to music with portable music players intensively for a long period of time, while the other group had not. Here, by means of magnetoencephalography, we objectively examined detrimental effects of portable music player misusage on the population-level frequency tuning in the human auditory cortex. Extensive and inappropriate usage of portable music players might cause subtle damages in the auditory system, which are not behaviorally detectable in an early stage of the hearing impairment progress. However, in noisy environments, the player volume is often set to extremely high levels in order to drown out the intense ambient noise and satisfy the appetite for music. These findings are similar to those observed in normal volunteers stimulated with pure tones.Nowadays, many people use portable players to enrich their daily life with enjoyable music. There was a statistically significant increase in perfusion in area 39 of Brodmann, more intense on the right side, with increased perfusion also in both frontal lobes at the middle gyrus, with bilateral hypoperfusion in area 38 of Brodmann. The two patients who were image tested with neuroSPECT had similar findings. All of the 32 subjects had musical auditory perceptions following their hearing loss in the second ear or when hearing loss in both ears occurred simultaneously. Two of these patients were image tested with single photon computerized emission tomography (neuroSPECT) while they were having these perceptions. They were asked if they had ever had the sensation of having musical auditory perceptions without external auditory stimuli. Thirty two patients who had had abrupt bilateral severe sensorineural hearing loss (the interval between the losses of both ears could have been years) were contacted. (4) To establish a hypothesis for the mechanisms of these occurrences. (3) To compare these findings with our normal databases of unstimulated and pure tone-stimulated volunteers. (2) To determine if there is a biological substrate to the process of recalling previous auditory perceptions. (1) To determine if spontaneous musical auditory perceptions occur in patients who develop abrupt bilateral severe sensorineural hearing loss (not necessarily simultaneously). The objectives of this study were as follows. It is likely that an abrupt bilateral loss of inner ear function might uninhibit neuronal groups storing auditory memory. When an individual has abrupt bilateral sensorineural hearing loss, stored musical memory can be released and this person can have musical perceptions without an external source. The findings in both subjects who were image tested while having these perceptions are suggestive of a biological substrate for this process and of a central locus for auditory memory seemingly located in and around area 39 of Brodmann. Spontaneous musical auditory perceptions commonly occur in patients who develop abrupt bilateral sensorineural hearing loss. ![]()
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