Table 2.

Tasks of process-based multi-task cognitive training program.

Categories	Tasks	Targeted domain	Difficulty levels/rounds	number of hours	A brief description of the tasks
Warm-up exercise	Recall the names	Memory	0/20	10min	Firstly, introduce yourself one by one (i.e., name, age, occupation). Then, inform participants to remember these names. The participants are asked to write down the names of the other five on white paper according to their memory at the end of cognitive training.
	You act I guess	Working memory	0/1		Firstly, participants were divided into three groups of two. Then, one participant facing the audience uses the most accurate body language to express the meaning of words, while other participants with their backs to the audience are asked to guess those words. Each group is limited to 2 min.
Practice in order	Match the cylinders	Executive function	1/64	50min	Firstly, take any set of socket cylinder socket*, make the cylinder out of the socket, placed near the corresponding socket block, then throw the order of a group of cylinders into confusion. The participants will be required to place each cylinder into appropriate holes in a long wooden socket block with the left-to-right or the right-to-left order. There are sixty-four cylinder socket combinations. With more socket cylinders and change in combination model shown, the difficulty level increases.
	Match the socket apertures		2/64		Firstly, take any set of socket cylinder socket, make the cylinder out of the socket, placed near the corresponding socket block, then throw the order of a group of cylinders into confusion. A wooden cylinder was selected and placed it into the participant’s hand. The participants will be required to find the corresponding position of each cylinder and place it into appropriate holes in a long wooden socket block. With more socket cylinders and changes in the combination model shown, the difficulty level increases.
	Locate the cylinders		3/64		Firstly, take any set of socket cylinder socket on the table, make the cylinder out of the socket, placed socket block on another table. The participants will be required to select suitable cylinders that were shown in the first group and place each cylinder into appropriate holes in a long wooden socket block with the left-to-right or the right-to-left order according to their memory. With more socket cylinders and changes in the combination model shown, the difficulty level increases.
Expanding training	Recall the cylinders		4/64		The participants will be required to complete a task on level 1 (Match the cylinders) with eyes closed. With more socket cylinders and changes in the combination model shown, the difficulty level increases.
	Recall and locate the cylinders		5/64		The participants will be required to complete a task on level 2 (Match the socket apertures) with eyes closed. With more socket cylinders and changes in the combination model shown, the difficulty level increases.
	Recall the sequence of the colored cylinders		6/64		Firstly, take any set of socket cylinder socket with colors ** (Brand Name: DAWONMONTESSORI; Model Number: DW 1002). Then the participants will be required to complete a task on level 1 (Match the cylinders). With more socket cylinders and changes in the combination model shown, the difficulty level increases.
	Stereoscopic cylinders training		7/4		Firstly, take any group of cylinder with colors**. Participants were asked to stack two or more cylinders high according to the card. The card consists of nine squares of the same size. Forty cylinders of different colors and diameters are inside the nine square randomly. The cylinder is not evenly distribute in the square. With more number of stacks, the difficulty level increases.
	Hunt for the colors		8/10		Firstly, take any set of socket cylinder socket with colors (red or green, blue, yellow) are shown. Then the participants will be required to complete a task on level 1 (Match the cylinders) according to cylinder color card (the time of observing card should not exceed 60 s). With more socket cylinders and changes in the combination model shown, the difficulty level increases.

*The first set of cylinders increases in depths and widths, the second set of cylinders only increases in depths with the same widths, the third set of cylinders only increases in widths with the same depths and the last set of cylinders increases in widths but decreases in depths.

**The Cylinders are four sets of wooden cylinders, each a different color with varying widths and depths as same as the cylinder blocks.