IN OUR first study1 we accepted the progressive nature of the pathologic condition of the deaf-mute child. We also defined "vanishing perception" and its characteristics, stating that it partakes of a series of phenomena ending with the total loss of perception of audiometric tones. Successive tests trying to register repetitions of this fugitive sensation in the same audiograms and at the same frequencies led us to the verification of these facts. This explains why statistical data were taken from first and later audiometric tests, the purpose being to make sure of the reproduction of the evanescent perception.
It was through consecutive trials that we came to observe in many cases some new facts which later on we shall relate to the pathologic process of deaf children. Those facts may be stated thus: There is a falling off or a disappearance of the thresholds recorded in first tests. The latter may
LACERDA AP, VERVLOET AE. AUDIOMETRIC STUDIES OF THE RESIDUAL HEARING OF PUPILS OF RIO DE JANEIRO NATIONAL INSTITUTE FOR THE DEAF: Study of the Progress of the Impairment of the Children's Hearing. Arch Otolaryngol. 1948;47(3):264–279. doi:10.1001/archotol.1948.00690030274002
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