 1. Trial Making test A B: It is a valid and reliable well-established test, which is a valid measure to target speed of processing, response inhibition and task-switching. This test is graded by time. It has been used widely in clinical evaluations for the assessment of deficits in cognitive function. It is administered in two parts: 1 Trial Making test form A, the subject is required to draw lines sequentially connecting numbered circles arranged randomly on a page as quickly as possible; 2 Trial Making test form B is a more demanding task as it requires the subject to connect circles containing numbers and letters in an alternating sequence. 