Multiple bottlenecks in overlapping task performance.

A dual-bottleneck model for overlapping-task performance is proposed. A central bottleneck prevents central processes in overlapping tasks from operating in parallel. A response-initiation bottleneck prevents 2 responses from being initiated in close succession. Response requirements of the overlapping tasks were manipulated in order to demonstrate the existence of the latter bottleneck and to assess its role in delimiting overlapping-task...