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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Operant measurement of auditory threshold in prelingually deaf users of cochlear implants: II

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Author(s):
Wagner R. da Silva ; Deisy G. de Souza ; Maria Cecília Bevilacqua ; Jair Lopes Jr.
Total Authors: 4
Document type: Journal article
Source: Psychology & Neuroscience; v. 4, n. 1, p. 89-102, Jun. 2011.
Abstract

Two experiments evaluated an operant procedure for establishing stimulus control using auditory and electrical stimuli as a baseline for measuring the electrical current threshold of electrodes implanted in the cochlea. Twenty-one prelingually deaf children, users of cochlear implants, learned a Go/No Go auditory discrimination task (i.e., pressing a button in the presence of the stimulus but not in its absence). When the simple discrimination baseline became stable, the electrical current was manipulated in descending and ascending series according to an adapted staircase method. Thresholds were determined for three electrodes, one in each location in the cochlea (basal, medial, and apical). Stimulus control was maintained within a certain range of decreasing electrical current but was eventually disrupted. Increasing the current recovered stimulus control, thus allowing the determination of a range of electrical currents that could be defined as the threshold. The present study demonstrated the feasibility of the operant procedure combined with a psychophysical method for threshold assessment, thus contributing to the routine fitting and maintenance of cochlear implants within the limitations of a hospital setting. (AU)

FAPESP's process: 08/57705-8 - Institute for the Study of Behavior, Cognition and Teaching
Grantee:Deisy das Graças de Souza
Support type: Research Projects - Thematic Grants
FAPESP's process: 03/09928-4 - Emergent relationships between stimuli and symbolic function: implications for behavior, knowledge and teaching
Grantee:Júlio César Coelho de Rose
Support type: PRONEX Research - Thematic Grants