The influence of noise on verbal auditory temporal ordering ability

PURPOSE: to investigate the relationship between ambient noise levels in classrooms and auditory temporal ordering ability for verbal sounds. METHODS: a cross-sectional descriptive study of a sample of 209 students aged 7‒10 years was conducted. Noise levels were measured in 13 classrooms at 8 Belo Horizonte public schools. The acoustic parameter for this assessement was the equivalent sound pressure level for unoccupied and furnished classrooms according to the American National Standards Institute (ANSI) standard S12.60. To assess the verbal auditory temporal ordering ability of students, a verbal sequential memory test was given. For statistical analysis, noise was categorized on the basis of the median noise level value and related to the students' achievement in the test. RESULTS: most students showed normal results and no statistical difference was found regarding sex and age. All classrooms had noise levels above the upper limits recommended by international (ANSI S12.60 and Bulletin 93) and national (Brazilian Association of Technical Standards - NBR10152) standards. Significant differences were found when relating the noise with student test performance, with greater alterations in the students belonging to the noisiest rooms. CONCLUSION: ambient classroom noise levels were above those permitted by the standards. Classroom noise was associated with greater difficulties in auditory temporal ordering ability.