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. Author manuscript; available in PMC: 2014 Mar 1.
Published in final edited form as: Cognition. 2012 Dec 31;126(3):391–396. doi: 10.1016/j.cognition.2012.10.012

Figure 1. Memory tests with four levels of concurrent cognitive demand.

Figure 1

Monkeys were required to remember an image over a memory interval that was either empty, or filled by one of three tasks: 1) motor: touch a blue square, 2) image: touch a non-classifiable image, or 3) classify: classify a central image as a bird, fish, flower, or person by touching the corresponding symbol. Motor and image stimuli could appear in any of the four screen corners. All three concurrent tasks required the same motor response.