Abstract Subjects performed one of three dial-coding tasks in the presence of either predictable or unpredictable simulated workplace noise (85 dBA) or in quiet. The dial-coding tasks differed in terms of information input rate and control over task pacing. Postexposure performance was assessed using frustration tolerance and proofreading tasks. Performance on the postexposure tasks indicated that behavioral aftereffects were related more to the prior task situation than to prior noise exposure. In particular, reduced tolerance for frustration was found among those who had previously performed externally paced tasks. Overall concurrent task performance was not adversely affected by either type of noise, but when dial-coding performance was further examined by comparing performance during noise versus quiet intervals, some evidence of disruption in response to the unpredictable noise was found. These findings are interpreted within the capacity model of attention.