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Reliability and Validity of Eye Movement Measures of Reading.pdf


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EYE-MOVEMENT

MEASURES OF READING

735

THE SCORES

The mean scores, the S.E.'s of the means, and the reliabilities 10 of the achievement tests are listed below:
C.C. Speed R.:
M = 21.8, <xu = 43, Reliabilityr = .76
Iowa Silent R.:
M = 59.7, au = 1.51, Reliabilityr = .87
Minn. R.E. Vocab.: M = 53.1, <m = 1.48, Reliability r = .90
The averages and distributions are typical and the reliabilities
satisfactory.
In Tables I, 2, and 3 are given the means and S.E.'s of
the means for the eye-movement measures for each type of
material read before the camera. The means for perception
time, fixation frequency, and regression frequency are averages
per line; for pause duration the average is for all pauses in
the selection. The unit of measurement for pause duration
and perception time (number of fixations times pause duration) is one-fiftieth second.
Examination of the tables reveals some variation from one
paragraph to another within each kind of material. This is
especially noticeable in paragraph A of the hard prose in comparison with the succeeding sections. Apparently it is more
difficult to adapt to the requirements of reading hard prose for
comprehension than with easy prose. Also it is possible that
TABLE 1
MEANS AND S.E.'S OF THE MEANS FOR EYE-MOVEMENT MEASURES FOR EAST PROSE

Paragraph

P
A
B
C
A-C
D
E
F
D-F
A-F
10

No.
Lines

8
5
10

8
23
12

6
5
23

46

Pere. Time

Fixation!

M

"it

M

90.78

3.26
2.84

8.51

97.19
80.36
77.04
82.65
90.00
7948
90.65
88.57
85.68

2.21
2.IO
2.22
2.09
2.17
2.26
2.05

1-97

8.83
7-52
7.22
7.65
8.12
7.50
8.73
8.14
7.89

•27
.20
•15
.18
.16
•17
•19

Regreisions

P. Duration

M

M

«M

10.79
II.07
IO.75
IO.85
IO.87
II.05
IO.53
IO.85
10.91
IO.89

•«9

1.19

i-35
1.06
0.94
1.04
1.19
0.92

•»9

1.39

•17
.16

1.19
1.13

.10
.09
.08
.07
.07
.08
.08
.11
.08
.07

.18

.16
.16
•'§
.16
.14
•17

.15
.16

Litterer, O. F., of. cit.; and Litterer, 0 . F., An experimental study of visual
apprehension. / . Appl. Psychol., 1933, 17, 266-276.