Digit Symbol-Coding. This task consists of rows containing small blank squares, each paired with a randomly assigned number from one to nine. A key is printed above these rows pairing each number with a different nonsense symbol. Following a practice trial on the first seven squares, the participant must fill in the black spaces with the symbol that is paired to the number above the blank space during 120 seconds. In this study, it was especially used to measure sustained attention.
Picture Completion. The participant is presented with a series of slides with images that have an important part missing. The participant must read and indicate the missing part of the image.The complexity of the test increases as the participant provides a correct answer. The score of the test is the number of correct answers. This test was used to study selective attention.