ons within the series varied such that triangles and squares never appeared
irectly opposite one another (i.e., 100,010; 010,100; 001,010; 010,001). The
12 “different” trials comprise four trials (one at each color) combining series of
one and two, four trials (one at each color) combining series of one and three,
and four trials (one at each color) combining series of two and three. As in the
“same” trials, the vertical position of the shapes in each series included in the
“different” trials was varied. In addition, the “different” trials were counter-
balanced such that in half of these trials there was a greater number of squares
and in half there were a greater number of triangles.
5. Shape String Test (FIND SHAPE). This test involves the presentation of a
“target” shape, followed by the presentation of a string of shapes, all of the same
color. Participants must respond “yes” if the target shape occurs in the string, or
“no” if the target does not occur in the string. The target shape appears on the
screen for 1,000 ms and is followed by the shape string with an interstimulus
interval of 250 ms. The string remains on the screen until participants make their
response. Twenty-four strings of three shapes are included in the test. Four differ-
ent shapes are used in this test: triangle, diamond, square, and octagon. Color is
varied across strings with each of four colors (red, green, blue, and yellow)
occurring six times. There are 12 “yes,” or match trials and 12 “no,” or non-
match trials. For the match trials, there are four matches at each of the three
possible locations.
6. Color String Test (FIND COLOR). This test involves the presentation of a
“target” color, followed by the presentation of a string of colors, all of the same
shape. Participants must respond “yes” if the target color occurs in the string, or
“no” if the target color does not occur in the string. The target color appears on
the screen for 1,000 ms and is followed by the color string with an interstimulus
interval of 250 ms. The string remains on the screen until participants respond.
ons within the series varied such that triangles and squares never appeared
irectly opposite one another (i.e., 100,010; 010,100; 001,010; 010,001). The
12 “different” trials comprise four trials (one at each color) combining series of
one and two, four trials (one at each color) combining series of one and three,
and four trials (one at each color) combining series of two and three. As in the
“same” trials, the vertical position of the shapes in each series included in the
“different” trials was varied. In addition, the “different” trials were counter-
balanced such that in half of these trials there was a greater number of squares
and in half there were a greater number of triangles.
5. Shape String Test (FIND SHAPE). This test involves the presentation of a
“target” shape, followed by the presentation of a string of shapes, all of the same
color. Participants must respond “yes” if the target shape occurs in the string, or
“no” if the target does not occur in the string. The target shape appears on the
screen for 1,000 ms and is followed by the shape string with an interstimulus
interval of 250 ms. The string remains on the screen until participants make their
response. Twenty-four strings of three shapes are included in the test. Four differ-
ent shapes are used in this test: triangle, diamond, square, and octagon. Color is
varied across strings with each of four colors (red, green, blue, and yellow)
occurring six times. There are 12 “yes,” or match trials and 12 “no,” or non-
match trials. For the match trials, there are four matches at each of the three
possible locations.
6. Color String Test (FIND COLOR). This test involves the presentation of a
“target” color, followed by the presentation of a string of colors, all of the same
shape. Participants must respond “yes” if the target color occurs in the string, or
“no” if the target color does not occur in the string. The target color appears on
the screen for 1,000 ms and is followed by the color string with an interstimulus
interval of 250 ms. The string remains on the screen until participants respond.
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