Table 1.

Experiment 1. Verbatim instructions for all tasks (complex form).

First sub-task (vehicles)	Second sub-task (books)
Task 1
First look at the centre of the screen. If there is a minus (−) sign, focus on the left half of the screen and if it is a plus (+) sign, focus on the right half. You will see a bike and a car. Look out for the bike. Below the bike, there will be a pair of letters. Touch the lower case letter, unless you see a dot below the lower case letter, in which case touch the dot instead	First look at the centre of the screen. If the digit is a 1, focus on the left half of the screen and if it is a 2, focus on the right half. You will see a pair of books. Look out for the open book. Below the open book, there will be two bars. Touch the horizontal bar, unless you see the letter T below the horizontal bar, in which case touch the both the bars one after the other (the horizontal first)
First sub-task (faces)	Second sub-task (animals)
Task 2
First look at the centre of the screen. If the letter is L, focus on the left half of the screen and if it is R, focus on the right. You will see a pair of faces. Look out for the male face. Below the male face, there will be a pair of shapes. Touch the larger shape, unless you see a symbol that looks like an i, just below the larger shape in which case touches the male face instead	First look at the centre of the screen. If the arrow is pointing left, focus on the left half of the screen and if it pointing right, focus on the right. You will see a pair of animals. Look out for the monkey. Below the monkey, there will be a pair of boxes. Touch the box that is crossed out, unless you see a II symbol below the crossed box, in which case touch the crossed box twice
First sub-task (coins)	Second sub-task (clocks)
Task 3
First look at the centre of the screen. If the symbol is pointing left, focus on the left half of the screen and if is pointing right, focus on the right. You will see a pair of coins. Look out for the coin showing heads. Below the heads coin, there will be a pair of boxes with dots in them. Touch the box with more dots, unless you see a <> symbol below the box with the most dots, in which case touch the symbol below the box with the fewer dots	First look at the centre of the screen. If the letter is an A, focus on the left half of the screen and if it is the letter B, focus on the right. You will see a pair of clocks. Look out for the digital clock. Below the digital clock, there will be a pair of symbols. Touch the $ symbol, unless you see a box with a * in it just below the $ symbol in which case touch the star just above the clock
First sub-task (words)	Second sub-task (cards)
Task 4
First look at the centre of the screen. If the circle is blue, focus on the left and if it is red, focus on the right. You will see a pair of words. Look out for the real/proper word. Below the real word, there will be a pair of numbers. Touch the lower number, unless you see an = sign below the lower number, in which case touch between the two parallel lines just below the numbers instead	First look at the centre of the screen. If the left side of the box is shaded, focus on the left half of the screen and if the right side is shaded, focus on the right. You will see a pair of playing cards. Look out for the picture/face card. Below the picture card, there will be a pair of boxes. Touch the box that is filled in (with black) unless you see a broken circle just below the filled in box, in which case touch between the square brackets just above the picture card