Table 2. Stimulus sequences used in each step of experiment 1b.

Step 1
	A		B		C		D
Trial	P	N	P	N	P	N	P	N
1	+ R	□	+ L	□	o L	□	o R	□
2	+ L	□	+ L	□	+ R	□	+ L	□
3	o R	□	o R	□	o L	□	o L	□
4	+ R	□	o L	□	+ R	□	+ R	□
5	o L	□	+ R	□	+ L	□	o R	□
6	o R	□	o L	□	o R	□	o L	□
7	+ L	□	o R	□	+ R	□	+ R	□
8	o R	□	+ L	□	+ L	□	+ L	□
9	+ L	□	+ R	□	o R	□	o R	□
10	o L	□	o R	□	o L	□	+ L	□

The composition of four different predetermined sequences A-D (PowerPoint presentations), containing 10 trials each, used in steps 1–4 of experiment 1b. For each trial, the positive stimulus that served as sample and corresponding stimulus and its position are shown. The negative stimulus that served as distracting stimulus is also shown for each trial. P =  positive stimulus; N =  negative stimulus; + =  cross; o =  circle; ▵ =  triangle; T =  reversed letter ‘T’; □ =  blank square; R =  right; L =  left.