Gilmore, G. C., Hersh, H., Caramazza, A., & Griffin,
J. (1979). Multidimensional letter similarity derived from
recognition errors. Perception & Psychophysics,
25, 425-431.
Summary:
Experimenters collected a confusion matrix on briefly
presented stimuli with open-ended verbal response.
Procedure:
Stimuli were presented from 10-70 ms,
adjusted for each individual, with a mean of 33 ms across
participants, so that the proportion of correct responses
was about 50%. Stimuli subtended 14' x 20' at 64 cm, in
green against a dark background.
Stimuli
Stimuli were described as filling a 5x7
dot-matrix, and were presented in Figure 1, but too small to
reproduce legibly. Below is a reproduction of those letters
in a 5x7 dot pattern identical to those found in Figure 1,
although both the aspect ratio and the relative size of the
filled pixels may be different from the original
stimuli.
Results
The original confusion matrix can be found here. Authors also
presented a symmetric similarity matrix with corresponding
response bias according to a Choice Model, based on the
original confusions, and a Euclidean distance matrix based
on an Multi-dimensional Scaling (MDS) solution. Data were
entered with OCR software, and little or no effort was made to verify
correctness.
Back to main Letter Similarity Data Set Archive Page
Back to main Letter Similarity Data Set Archive Page