TSP Task Switching Procedure
The ability to follow rules in a flexible manner is one of the most important aspects of executive function. In the task switching test, the ability to switch rule in a dynamic manner can be examined. The subject is asked to touch the green buttons in response to one of two rules signaled by the design shown in the majority of the target buttons (the "context"). One rule tells the subject whether to touch the green button corresponding to the grey or yellow target, and the second tells the subject whether to touch the button corresponding to the target in the inner, smooth or outer, spiky layer of the display. Once the subjects have practiced the rules, which rule which applies on any given trial can be changed dynamically by changing the context, either in a regular manner such as alternation, or in a randomized manner. The warning time can also be altered by using a neutral background color, and displaying the context at varying intervals before the targets appear. By comparing the time needed to make a correct choice under the different conditions, a measure of the participant's ability to switch rules in a flexible manner can be obtained.
