Study: NCT03132961

Intervention type: OTHER
Intervention: Infrasound exposure
Description: All cohorts will receive an identical infrasound exposure of equal time duration, varying only the order in which the testing is performed. To simulate the frequencies generated by a common source of environmental infrasound (wind turbines), recordings measured at a full-scale research wind turbine at the University of Minnesota will be utilized to create an infrasound stimulus. The resultant sound file consists of the fundamental frequency at approximately 0.7 Hz, equal to the blade passage rate, plus the harmonic overtones of the fundamental frequency. The presentation level is 85 dB SPL. The stimulus will be presented in a sound field.

Intervention type: OTHER
Intervention: Infrasound exposure
Description: All cohorts will receive an identical infrasound exposure of equal time duration, varying only the order in which the testing is performed. To simulate the frequencies generated by a common source of environmental infrasound (wind turbines), recordings measured at a full-scale research wind turbine at the University of Minnesota will be utilized to create an infrasound stimulus. The resultant sound file consists of the fundamental frequency at approximately 0.7 Hz, equal to the blade passage rate, plus the harmonic overtones of the fundamental frequency. The presentation level is 85 dB SPL. The stimulus will be presented in a sound field.

Intervention type: OTHER
Intervention: Infrasound exposure
Description: All cohorts will receive an identical infrasound exposure of equal time duration, varying only the order in which the testing is performed. To simulate the frequencies generated by a common source of environmental infrasound (wind turbines), recordings measured at a full-scale research wind turbine at the University of Minnesota will be utilized to create an infrasound stimulus. The resultant sound file consists of the fundamental frequency at approximately 0.7 Hz, equal to the blade passage rate, plus the harmonic overtones of the fundamental frequency. The presentation level is 85 dB SPL. The stimulus will be presented in a sound field.

Intervention type: OTHER
Intervention: Infrasound exposure
Description: All cohorts will receive an identical infrasound exposure of equal time duration, varying only the order in which the testing is performed. To simulate the frequencies generated by a common source of environmental infrasound (wind turbines), recordings measured at a full-scale research wind turbine at the University of Minnesota will be utilized to create an infrasound stimulus. The resultant sound file consists of the fundamental frequency at approximately 0.7 Hz, equal to the blade passage rate, plus the harmonic overtones of the fundamental frequency. The presentation level is 85 dB SPL. The stimulus will be presented in a sound field.

Intervention type: OTHER
Intervention: Infrasound exposure
Description: All cohorts will receive an identical infrasound exposure of equal time duration, varying only the order in which the testing is performed. To simulate the frequencies generated by a common source of environmental infrasound (wind turbines), recordings measured at a full-scale research wind turbine at the University of Minnesota will be utilized to create an infrasound stimulus. The resultant sound file consists of the fundamental frequency at approximately 0.7 Hz, equal to the blade passage rate, plus the harmonic overtones of the fundamental frequency. The presentation level is 85 dB SPL. The stimulus will be presented in a sound field.

Intervention type: OTHER
Intervention: Infrasound exposure
Description: All cohorts will receive an identical infrasound exposure of equal time duration, varying only the order in which the testing is performed. To simulate the frequencies generated by a common source of environmental infrasound (wind turbines), recordings measured at a full-scale research wind turbine at the University of Minnesota will be utilized to create an infrasound stimulus. The resultant sound file consists of the fundamental frequency at approximately 0.7 Hz, equal to the blade passage rate, plus the harmonic overtones of the fundamental frequency. The presentation level is 85 dB SPL. The stimulus will be presented in a sound field.