me using squares. The presentation order of the 24 test trials is randomized in
ne fixed order.
3. Size Test (SIZE). In this test, a participant’s task is to indicate whether the
wo shapes appearing side by side in the center of the screen are the same size or
ifferent sizes. Three different shapes (triangle, square, and octagon) and two
ifferent colors (red and yellow) are used in this test. Color is varied across trials,
ut is held constant within trials. There are four possible conditions for the sizes
f the shape pairs: small-small, small-large, large-large, and large-small. This
s the only RT test using stimuli larger than .5 inch by .5 inch; the large-size
hapes used in this test are approximately 1 inch in height by 1 inch in width. The
est comprises 24 trials with each possible condition occurring equally often for
ach of the three shapes and each of the two colors (i.e., four conditions by three
hapes by two colors, resulting in 24 trials).
4. Number Test (NUMBER). A participant’s task in this test is to indicate
whether two series of vertically presented shapes are the same or different in
uantity. This test uses only squares and triangles presented in red, yellow, blue,
r green. Again, color is varied only across trials and not within trials. Each trial
onsists of one vertical series of squares and one vertical series of triangles; a
eries of squares always appears on the left side of the screen and a series of
iangles always appears on the right side of the screen. The maximum number of
quares or triangles in any series is three and the minimum number is one; all
ials include series of one, two, or three. The 12 “same” trials include four trials
one at each color) with series of three squares and three triangles, four trials (one
t each color) with series of two squares and two triangles with varied combina-
ons with regard to vertical position such that the series of squares and triangles
re never identical (i.e., 110,011; 011,110; 101,110; lOl,Oll), and four trials
one at each color) with series of one square and one triangle with vertical posi-
me using squares. The presentation order of the 24 test trials is randomized in
ne fixed order.
3. Size Test (SIZE). In this test, a participant’s task is to indicate whether the
wo shapes appearing side by side in the center of the screen are the same size or
ifferent sizes. Three different shapes (triangle, square, and octagon) and two
ifferent colors (red and yellow) are used in this test. Color is varied across trials,
ut is held constant within trials. There are four possible conditions for the sizes
f the shape pairs: small-small, small-large, large-large, and large-small. This
s the only RT test using stimuli larger than .5 inch by .5 inch; the large-size
hapes used in this test are approximately 1 inch in height by 1 inch in width. The
est comprises 24 trials with each possible condition occurring equally often for
ach of the three shapes and each of the two colors (i.e., four conditions by three
hapes by two colors, resulting in 24 trials).
4. Number Test (NUMBER). A participant’s task in this test is to indicate
whether two series of vertically presented shapes are the same or different in
uantity. This test uses only squares and triangles presented in red, yellow, blue,
r green. Again, color is varied only across trials and not within trials. Each trial
onsists of one vertical series of squares and one vertical series of triangles; a
eries of squares always appears on the left side of the screen and a series of
iangles always appears on the right side of the screen. The maximum number of
quares or triangles in any series is three and the minimum number is one; all
ials include series of one, two, or three. The 12 “same” trials include four trials
one at each color) with series of three squares and three triangles, four trials (one
t each color) with series of two squares and two triangles with varied combina-
ons with regard to vertical position such that the series of squares and triangles
re never identical (i.e., 110,011; 011,110; 101,110; lOl,Oll), and four trials
one at each color) with series of one square and one triangle with vertical posi-
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