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for the letter recognition task, letters that were created to fill in a pattern of three dots were presented. the child had to click on the correct letter. this task was used to measure visual memory (vmt). for half of the participants, the letters were presented in a regular order (abcd e), and for the other half (odn u), they were presented in a mirror-reversed order.

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the letter backward task consisted of three conditions. in the spatial and temporal condition, letters appeared on a screen in a random order. the time between letters ranged from 700 milliseconds to 2000 milliseconds. for both conditions, the child had to indicate whether the letter was forward (i.e., toward the middle of the screen) or backward (i., toward the side of the screen) and whether the stimulus appeared on the left or right side of the screen (i., the spatial condition). the child learned to verbally respond when the letters appeared in one of two different locations on the screen (left or right). for half of the participants (i., group 2), the spatio-temporal condition was presented first. the remaining half of the participants (i., group 1) was instructed to memorize which side of the screen the letters appeared on (either left or right).

the flicker task consisted of 12 practice trials and 192 test trials. on the practice trials, the target letters appeared in a gray field with 16 letters flickering. the letters were 12 times the size of the target letters, and were composed of three differently colored squares. on the target trials, the letters appeared in a gray field with 20 letters flickering. the letters were 12 times the size of the target letters, and composed of one square of each of the three differently colored squares. the letters on the practice trials matched the ones on the target trials. the letters on the practice trials were presented in five different positions (bottom, left, middle, right, and top) in the gray field.