Geyer, L. H. (1977). Recognition and confusion of the
lowercase alphabet. Perception & Psychophysics, 22, 487-490.
Experimenter provides a confusion matrix for the lowercase
Letters were the Tactype Futura demi 5424 font face,
with tall letters subtending .2 degrees visual angle.
Brightness and duration were adjusted to achieve 50% correct
scanned reproduction of these letters from the original
article is shown below.
The confusion matrix are available here. For this matrix, each row
represents a presented stimulus, and each column a
response. Results are based on seven paid volunteers, who
each performed 650 trials across two sessions (with two
other preparatory sessions.)
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