FIGURE 1.

Example list for each task included in the present study. The “t” task required participants to perform arithmetical operations that appeared in red or blue inside two boxes. The “tS” task involved performing arithmetical operations and memorising the result for each box. Participants had to recall the last result for each box at the end of the list. The “Rt” task consisted of memorising two initial numbers for their corresponding box. Then, for each item, the participant had to retrieve the value for the box and use it as the first operand for the operation presented. The initial numbers were to be recalled at the end of the list. The “RtS” task involved memorising two initial numbers for each box. Following that, different arithmetical operations had to be applied to the number memorised for the corresponding box. The result for each operation had to be memorised for future use and, at the end of the list, the last two results for each box were to be recalled. See the text for further details.