Methods: Cross-sectionalstudy in which 43 rural workers of both genders with bilaterally normal
auditory thresholds that were occupationally exposed to organophosphates were assessed.The procedures included the following items: questionnaire regarding personal and professional background, period of exposition to organophosphates, otoscopy, pure-tone audiometry. Auditory temporal processing was tested through: the Frequency Pattern Test, the Duration Pattern Test and the Gaps-In-Noise Test. Performance on the tests were analyzed, as well as differences between left and right ears on the Gaps-In-Noise Test, and education level in all tests.