Neurobiological Signatures of Auditory False Perception and Phantom Perception as a Consequence of Sensory Prediction Errors.

In this study, we hypothesized that top-down sensory prediction error due to peripheral hearing loss might influence sensorimotor integration using the efference copy (EC) signals as functional connections between auditory and motor brain areas. Using neurophysiological methods, we demonstrated that the auditory responses to self-generated sound were not suppressed in a group of patients with tinnitus accompanied by significant hearing impairment and in a schizophrenia group. However, the response was attenuated in a group with tinnitus accompanied by mild hearing impairment, similar to a healthy control group. The bias of attentional networks to self-generated sound was also observed in the subjects with tinnitus with significant hearing impairment compared to those with mild hearing impairment and healthy subjects, but it did not reach the notable disintegration found in those in the schizophrenia group. Even though the present study had significant constraints in that we did not include hearing loss subjects without tinnitus, these results might suggest that auditory deafferentation (hearing loss) may influence sensorimotor integration process using EC signals. However, the impaired sensorimotor integration in subjects with tinnitus with significant hearing impairment may have resulted from aberrant auditory signals due to sensory loss, not fundamental deficits in the reafference system, as the auditory attention network to self-generated sound is relatively well preserved in these subjects.

Development of the Jordanian Arabic early speech perception test.

INTRODUCTION: The Early Speech Perception (ESP) test has been previously used to assess speech perception skills in young hearing-impaired children. As the Arabic language is known to be diglossic, the purpose of this study was to develop a Colloquial Jordanian Arabic version (JAESP) of the ESP test and to check its usefulness. METHODS: The JAESP test encompasses four categories: detection of speech sounds, speech pattern perception, disyllabic word identification, and monosyllabic word identification. Picture boards representing the test materials were created and two equivalent lists for each test category were made. The word identification task was used to test a total of 43 children with reported normal-hearing abilities (15 children aged 3 years, 15 aged 4 years, and 13 aged 5 years). RESULTS: The scores for all age groups were 98-100% for all test materials. Statistical analysis showed that there was no significant difference between age groups and between lists (p ˃ 0.05). CONCLUSION: The findings of this study indicate that the JAESP test materials are appropriate for Jordanian children who are at least 3 years old. Additional studies are needed to verify the validity of the test materials for Jordanian hearing-impaired children.