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. Author manuscript; available in PMC: 2016 Apr 1.
Published in final edited form as: Psychol Sci. 2015 Mar 6;26(4):456–466. doi: 10.1177/0956797614567510

Table 1.

Means and standard deviations of participant demographics and results from cognitive and perceptual tests.

Younger Older
Variable Mean SD Mean SD
Age (years) 22.43 1.16 71.23 5.85
Education (years) 15 0.88 15.15 2.34
Log Contrast Sensitivity 1.37 0.43 1.29 0.19
LogMAR Visual Acuity* −0.02 0.09 0.09 0.12
Digit Span Forward 10.79 1.72 9.85 1.63
Digit Span Backward 7.71 1.94 6.23 2.39
WAIS – Matrix Reasoning* 20.29 2.67 16.92 4.19

Note:

1

Contrast sensitivity measured using the Pelli Robson Test (Pelli, Robson & Wilkins, 1988).

*

Difference between groups is significant at p < 0.05.