The BTA is an auditory perception task that measures divided attention in the verbal-linguistic system. It provides a rapid, bedside assessment of attentional impairment among nonaphasic hearing adults, including those with visual and motor impairments that preclude tests which require visual scanning or manual dexterity. The BTA consists of two parallel forms presented via audiocassette. On Form N (Numbers), a voice reads ten lists of letters and numbers that increase in length from 4-18 elements. The respondent’s task is to disregard the letters presented and count how many numbers were read aloud. Form L (Letters) consists of the same ten lists, but the respondent must disregard the numbers and count how many letters were read aloud. The number of correctly monitored lists is summed across both forms, with raw scores ranging from 0-20. Test materials include the Professional Manual, the Stimulus Audiotape, and the Scoring Form.