Table 1.

Table 1a. Features of each attention condition.
		Attention Condition
Experimental Feature	1-shape	100%	80%	50%	20%
Attention Trial Block	1-shape	100%	80%–20%	50%	80%–20%
No. of Attended-shape Items	2,3,4, or 6	2 or 3	2 or 3	4 or 6a	2 or 3
No. of Ignored-shape Items	0	2 or 3b	2 or 3b	0	2 or 3b
No. of Shapes present	1	2	2	2	2
Probe typesc	1–3	1–4	1–4	1–4	1–4

Table 1b Features of each probe type.
	Probe Type
	1. No	2. New	3. Location	4. Other shape's
Probe Feature	change	color	change	color
Probe’s color in array?	yes	no	yes	yes
Probe’s color in probe’s
shape in array?	yes	no	yes	no
Probe identical to array
item in that location?	yes	no	no	noa
Correct Response	same	out	specific	out
	loc		diff loc
Acceptable response	same	any diff	any diff	any diff
for k analysis	loc	loc or out	loc or out	loc or out

Table 1c Trials per participant in each combination of attention condition and probe type.
	Attention Condition
Probe Type	1-shape	100%	80%	50%	20%
1. No change	32	30	32	24	8
2. New color	16	10	16	8	4
3. Location Change	16	10	16	8	4
4. Other shape's color	0	10	16	8	4

Note. No. = number.

^aAttention divided between both shapes, equally represented in array

^bSame number of attended and ignored items

^cThese probe type numbers refer to Table 1b.

Note. loc = array location, diff = different, out = the out door icon

^aThe probe is the same shape as the array item at its location but the color is from an item elsewhere in the array of the other shape.