Neural representation of octave illusion in the human cortex revealed with functional magnetic resonance imaging

Publication date: Available online 8 January 2018
Source:Hearing Research
Author(s): Keita Tanaka, Hiroki Kurasaki, Shinya Kuriki
The auditory “octave illusion” arises when dichotic tones, presented one octave apart, alternate rapidly between the ears. This study aimed to explore the link between the perception of illusory pitches and brain activity during presentation of dichotic tones. We conducted a behavioral study of how participants perceived binaural dichotic tones of octave illusions and classified them, based on the reported percepts, in an illusion (ILL) group, without an illusion (non-ILL) group, and others. We recorded brain activity using functional magnetic resonance imaging and analyzed the activation due to dichotic illusion tones. The activation in the bilateral planum polare in the auditory cortex was significantly larger in the ILL group than in the non-ILL group. In the right premotor cortex, the non-ILL group showed a significantly larger activation than did the ILL group, suggesting that the sensation of the meter to the stimulus sound was significant in the non-ILL but not in the ILL group. The results indicated that the activity in these areas was related to the occurrence of octave illusions. The nonsignificant sensation of the meter to the stimulus sound in the ILL group may be consistent with the perception of octave illusion.



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Neural representation of octave illusion in the human cortex revealed with functional magnetic resonance imaging

Publication date: Available online 8 January 2018
Source:Hearing Research
Author(s): Keita Tanaka, Hiroki Kurasaki, Shinya Kuriki
The auditory “octave illusion” arises when dichotic tones, presented one octave apart, alternate rapidly between the ears. This study aimed to explore the link between the perception of illusory pitches and brain activity during presentation of dichotic tones. We conducted a behavioral study of how participants perceived binaural dichotic tones of octave illusions and classified them, based on the reported percepts, in an illusion (ILL) group, without an illusion (non-ILL) group, and others. We recorded brain activity using functional magnetic resonance imaging and analyzed the activation due to dichotic illusion tones. The activation in the bilateral planum polare in the auditory cortex was significantly larger in the ILL group than in the non-ILL group. In the right premotor cortex, the non-ILL group showed a significantly larger activation than did the ILL group, suggesting that the sensation of the meter to the stimulus sound was significant in the non-ILL but not in the ILL group. The results indicated that the activity in these areas was related to the occurrence of octave illusions. The nonsignificant sensation of the meter to the stimulus sound in the ILL group may be consistent with the perception of octave illusion.



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Neural representation of octave illusion in the human cortex revealed with functional magnetic resonance imaging

Publication date: Available online 8 January 2018
Source:Hearing Research
Author(s): Keita Tanaka, Hiroki Kurasaki, Shinya Kuriki
The auditory “octave illusion” arises when dichotic tones, presented one octave apart, alternate rapidly between the ears. This study aimed to explore the link between the perception of illusory pitches and brain activity during presentation of dichotic tones. We conducted a behavioral study of how participants perceived binaural dichotic tones of octave illusions and classified them, based on the reported percepts, in an illusion (ILL) group, without an illusion (non-ILL) group, and others. We recorded brain activity using functional magnetic resonance imaging and analyzed the activation due to dichotic illusion tones. The activation in the bilateral planum polare in the auditory cortex was significantly larger in the ILL group than in the non-ILL group. In the right premotor cortex, the non-ILL group showed a significantly larger activation than did the ILL group, suggesting that the sensation of the meter to the stimulus sound was significant in the non-ILL but not in the ILL group. The results indicated that the activity in these areas was related to the occurrence of octave illusions. The nonsignificant sensation of the meter to the stimulus sound in the ILL group may be consistent with the perception of octave illusion.



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Hearing Difficulty Is Associated With Injuries Requiring Medical Care

Objective: Injuries are responsible for 11% of global disability-adjusted life years. Hearing difficulty may be a modifiable risk factor for injury. The primary aim was to determine whether subjective hearing difficulty is associated with increased incidence of injuries (all-type, workplace, and nonworkplace) serious enough to require health care among Americans aged 18 years and older. The secondary aim was to determine whether hearing difficulty is associated with increased use of health care for injuries. Design: The analysis was performed using data from the 1999 to 2012 Medical Expenditure Panel Surveys–Household Component (MEPS-HC). Multivariable estimates are generalizable to the American noninstitutionalized adult population in 2006. Hearing difficulty was determined by computer-assisted personal interview. The primary outcome was number of separate injuries requiring health care (emergency department visits, hospital inpatient admissions, or medical office visits) during the follow-up period. Crude injury incidence rates were calculated with 95% confidence intervals (CIs). Multivariable negative binomial regression was performed to determine the relative incidence rate of injuries among the group reporting hearing difficulties relative to the group reporting no difficulty in hearing, adjusting for relevant confounders. Variance estimates were adjusted to take into account the complex sample design. Results were stratified by sex. Results: Of the 121,453 participants in MEPS-HC panels 6-16, 107,352 (88.4%) had complete data and were included in the analysis. The average follow-up was 1.27 years. Seven thousand six hundred and twenty-four participants (7.1%) reported hearing difficulty at baseline. During the follow-up period, 10,727 participants (10.0%) had one or more injuries. In multivariable analyses, hearing difficulty was significantly associated with increased incidence of all-type (males: incidence rate ratio [IRR] 1.31, 95% CI 1.18–1.45, p value

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Hearing Difficulty Is Associated With Injuries Requiring Medical Care

Objective: Injuries are responsible for 11% of global disability-adjusted life years. Hearing difficulty may be a modifiable risk factor for injury. The primary aim was to determine whether subjective hearing difficulty is associated with increased incidence of injuries (all-type, workplace, and nonworkplace) serious enough to require health care among Americans aged 18 years and older. The secondary aim was to determine whether hearing difficulty is associated with increased use of health care for injuries. Design: The analysis was performed using data from the 1999 to 2012 Medical Expenditure Panel Surveys–Household Component (MEPS-HC). Multivariable estimates are generalizable to the American noninstitutionalized adult population in 2006. Hearing difficulty was determined by computer-assisted personal interview. The primary outcome was number of separate injuries requiring health care (emergency department visits, hospital inpatient admissions, or medical office visits) during the follow-up period. Crude injury incidence rates were calculated with 95% confidence intervals (CIs). Multivariable negative binomial regression was performed to determine the relative incidence rate of injuries among the group reporting hearing difficulties relative to the group reporting no difficulty in hearing, adjusting for relevant confounders. Variance estimates were adjusted to take into account the complex sample design. Results were stratified by sex. Results: Of the 121,453 participants in MEPS-HC panels 6-16, 107,352 (88.4%) had complete data and were included in the analysis. The average follow-up was 1.27 years. Seven thousand six hundred and twenty-four participants (7.1%) reported hearing difficulty at baseline. During the follow-up period, 10,727 participants (10.0%) had one or more injuries. In multivariable analyses, hearing difficulty was significantly associated with increased incidence of all-type (males: incidence rate ratio [IRR] 1.31, 95% CI 1.18–1.45, p value

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Hearing Difficulty Is Associated With Injuries Requiring Medical Care

Objective: Injuries are responsible for 11% of global disability-adjusted life years. Hearing difficulty may be a modifiable risk factor for injury. The primary aim was to determine whether subjective hearing difficulty is associated with increased incidence of injuries (all-type, workplace, and nonworkplace) serious enough to require health care among Americans aged 18 years and older. The secondary aim was to determine whether hearing difficulty is associated with increased use of health care for injuries. Design: The analysis was performed using data from the 1999 to 2012 Medical Expenditure Panel Surveys–Household Component (MEPS-HC). Multivariable estimates are generalizable to the American noninstitutionalized adult population in 2006. Hearing difficulty was determined by computer-assisted personal interview. The primary outcome was number of separate injuries requiring health care (emergency department visits, hospital inpatient admissions, or medical office visits) during the follow-up period. Crude injury incidence rates were calculated with 95% confidence intervals (CIs). Multivariable negative binomial regression was performed to determine the relative incidence rate of injuries among the group reporting hearing difficulties relative to the group reporting no difficulty in hearing, adjusting for relevant confounders. Variance estimates were adjusted to take into account the complex sample design. Results were stratified by sex. Results: Of the 121,453 participants in MEPS-HC panels 6-16, 107,352 (88.4%) had complete data and were included in the analysis. The average follow-up was 1.27 years. Seven thousand six hundred and twenty-four participants (7.1%) reported hearing difficulty at baseline. During the follow-up period, 10,727 participants (10.0%) had one or more injuries. In multivariable analyses, hearing difficulty was significantly associated with increased incidence of all-type (males: incidence rate ratio [IRR] 1.31, 95% CI 1.18–1.45, p value

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All you should know about Waardenburg syndrome

A look at Waardenburg syndrome, a group of diseases that cause changes in the body and eye color. Find out about how rare it is and the diagnosis.

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