01790caa a2200193   4500008004100000022001400041100001700055245014300072260000900215270009600224270010800320300001200428490002100440520093200461653006701393700001701460773005801477856006101535210621s9999    xx            000 0 und d  a2249-9571  aPrawin Kumar 0aEfferent System Activation Using Contralateral Suppression of Distortion Product Otoacoustic Emissions in Individuals with Normal Hearing.  c2015  aAudiologist Grade I,Indira Gandhi Medical College, Himachal Pradesh University,Shimla,India  aLecturer in Audiology,All India Institute of Speech and HearingManasagangothri, Mysore,Karnataka, India  a475-481  vVolume 5 Issue 8  aEfferent  system  can  be  activated  using  a  non  invasive  technique  named  as  contralateral  suppression  of distortion product otoacoustic emissions (DPOAEs). The present study was taken to estimate the amount of suppression noticed in three different age group (Young, middle & older) individuals in the age range of  17-70  years.The  results  of  the  study  revealed  that  there  are  significant  differences  for  distortion product  otoacoustic  emission  amplitude  observed  between  younger  and  older  age  group  individuals  in absence and presence of noise. However, similar differences were notevident between middle and older age  group  individuals.  Further,  there  were  differences  in  amount  of  suppression  across  different  age groups  only  at  1.5  kHz  and  2  kHz.  Hence,  present  study  highlights  efferent  system  activation  could  be partially alike across different age groups  aOtoacoustic Emission, Noise, Efferent system, Outer Hair cells  aVivek Sharma  aInternational Journal of Health Sciences and Research  uhttps://www.ijhsr.org/IJHSR_Vol.5_Issue.8_Aug2015/70.pdf