Abstract
Considerable effort has been expended in the study of changes of impedance of the ear due to reflex contractions of the middle ear muscles (M.E.M.). But rather less effort has been directed to the possibly more fundamental problem of determining what effect these contractions have upon the transmission of sound through the human ear.A new technique has been developed which gives quantitative values for the amount of attenuation of a low frequency tone that is produced by the M.E.M. in contralateral remote masking.Experiments, using a 250 Hz masked tone delayed in discrete steps with respect to the high frequency masking tone or noise (+ 80 dB, SPL), show that there is an increase in masking between 100-200 msec delay that is attributable to reflex contractions of the muscles. Further data is presented, using a more refined technique, where the masked tone may be delayed with respect to the start of the masking signal (on/off time of 0.5 sec) over the range of from -250 to +750 msec and is continuously var...
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