Reflex modification audiometry: assessment of acoustic sensory processing in the term neonate

Pediatric Research
E K AndayH S Hoffman


Behavioral and physiological work in animals and adult humans have established the sensitivity of various procedures and allowed delineation of the neuroanatomical pathways involved in sensory processing. Herein we used the glabellar reflex and reflex modification procedures to assess acoustic sensory processing capabilities in the term newborn infant. The eyeblink-eliciting device consisted of a miniature solenoid which could deliver a controlled tap. A photoreflective densitometer attached to a TDH-39 earphone assessed the eyeblinks. A total of 98 term infants was studied to determine how a response to a reflex-eliciting event (tap) was modified (either augmented or inhibited) by a mild exteroceptive stimulus (tone) which was presented at an appropriate lead interval. Ninety adult subjects were given identical testing procedures and their data were compared to that of the infants. The results of this study showed that newborn infants reliably exhibited an eyeblink response after a tap to the glabella. With fixed intensity tones, frequencies from 1 to 4 kHz produced equivalent amounts of reflex augmentation in infants and adult subjects. Blink amplitude increased as a function of increased tap and tone intensity in both infant...Continue Reading


May 11, 2012·Developmental Neuroscience·Sheryl S MoyBeverly H Koller
May 1, 1995·Perception & Psychophysics·T D Blumenthal
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Jan 8, 2011·Psychophysiology·Harriet J HuggenbergerHartmut Schachinger
Dec 19, 2012·Developmental Cognitive Neuroscience·Harriet J HuggenbergerHartmut Schachinger
Feb 1, 1991·Developmental Medicine and Child Neurology·E K AndayH S Hoffman
Feb 1, 1990·Developmental Medicine and Child Neurology·E K AndayH S Hoffman

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