The Relation Between Hearing Loss and Recruitment and its Practical Employment in the Determination of Receptive Hearing Losses

Brief-Tone Audiometry: Temporal Integration in the Hypacusic

“…The next four (Patients 3, 4, 5, 6) show that noise trauma is always accom¬ panied by disturbance of integration, roughly in proportion to' audiometrie loss. The next three (7,8,9) show how integration data can help pick up a nonperipheral defect overlaid on a preponderantly peripheral con¬ ductive loss.…”

“…We know that acoustic trauma does so accompanied by quick, asymptotic recruitment (Patients 3, 4, 5, 6, 22, 23 ). We know that at least one type of cochlear disorder does so, accompanied by quick but straight-line (not asymptotic) re¬ cruitment (11, 13), and that some types of cochlear disorder do so, accompanied by slight straight-line recruitment (8,9,12,16,21). We can, on the other hand, say even less about the sorts of intracochlear lesion which yield normal integrative data.…”

Brief Tone Audiometry: Results in Normal and Impaired Ears

“…The results of the investigation led to sev¬ eral conclusions: (1) the ear with cochlear pathology is clearly distinguished from the normal ear by brief tone audiometry; (2) brief tone audiometry appears to be an un¬ usually sensitive diagnostic tool; (3) brief tone audiometry might be useful in differentiating cochlear and retrocochlear lesions, even with patients having only a mild hearing loss; (4) the degree of abnor¬ mality in energy integration is proportional to the magnitude of the hearing loss; (5) abnormal energy integration and recruit¬ ment do not always occur together; (6) on the basis of present information, brief tone audiometry does not distinguish among var¬ ious cochlear pathologies.…”

Brief Tone Detection and Discrimination Tests in Clinical Audiology with Emphasis on their use in Central Nervous System Lesions

“…In contrast to the normal linear integration function of approximately 10 dB/ log unit change in duration, in the pathological ear the function may have a significantly less steep slope (that is, the difference in threshold between the short and long tones may be reduced to 3 dB or even less). In earlier studies, Miskolczy- Fodor (1953Fodor ( , 1956 suggested that abnormal integration functions were the result of an abnormal growth in loudness with increased intensity and, in fact, reflected the same loudness recruitment phenomenon as measured by the monaural loudness balance test. Subsequent studies (Harris et al, 1958;Sanders and Honig, 1967), however, failed to verify any one-to-one relationship between the occurrence of abnormal integration functions and recruitment.…”