Abstract
To analyze the possible relationships between high sound pressure levels in the classroom and performance in the use of lexical and phonological routes in reading and writing. This consisted on a quantitative and exploratory study. The following measures were carried out: acoustic measurement, using the dosimeter, visual inspection of the external auditory canal, tonal audiometry thresholds, speech recognition tests and acoustic immittance; instrument for evaluation of reading and writing of isolated words. The non-parametric χ² test and Fisher's exact test were used for data analysis. The results of acoustic measurements in 4 schools in Santa Maria divided the sample of 87 children of third and fourth years of primary school, aged 8 to 10 years, in 2 groups. The 1st group was exposed to sound levels higher than 80 dB(A) (Study group) and the 2nd group at levels lower than 80 dB(A) (Control group). Higher prevalence of correct answers in reading and writing of nonwords, reading irregular words and frequency effect were observed. Predominance of correct answers in the writing of irregular words was observed in the Control group. For the Study group, a higher number of type errors neologism in reading and writing were observed, especially regarding the writing of nonwords and the extension effect; fewer errors of lexicalization type and verbal paragraphy in writing were observed. In assessing the reading and writing skills, children in the Study group exposed to high noise levels had poorer performance in the use of lexical and phonological routes, both in reading and in writing.
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