Figure 5: Patient performance between 4/20/2013 and 5/20/2013 on four representative tasks (a) category identification, b) word identification, (c) picture matching level 3 and (d) multiplication level 3. X-axis indicates the specific dates of therapy activity, Left Y-axis indicates average accuracy and Right Y-Axis indicates average latency. As shown, performance on all four tasks declines between 4/27/2013 and 5/1/2013. Corresponding to decreases in accuracy, increases in latency are observed.