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. Author manuscript; available in PMC: 2009 Jul 1.
Published in final edited form as: Neurobiol Aging. 2007 Mar 26;29(7):1070–1079. doi: 10.1016/j.neurobiolaging.2007.02.008

Table 2.

Effects of speed and fractional anisotropy (FA)

β r2 Increment in r2 F Percentage attenuation
Hit RT
 Model 1
  Speed 0.364 0.133 5.52*
 Model 2
  FA-GNU −0.427 0.182 8.02*
  Speed 0.247 0.236 0.054 2.46 59.40
 Model 3
  FA-PCF −0.463 0.214 9.82*
  Speed 0.242 0.267 0.053 2.54 60.15
Correct rejection RT
 Model 1
  Speed 0.564 0.319 16.84*
 Model 2
  FA-GNU −0.479 0.229 10.72*
  Speed 0.453 0.410 0.181 10.75* 43.26
 Model 3
  FA-PCF −0.615 0.379 21.94*
  Speed 0.411 0.531 0.152 11.38* 62.92

Note: FA-GNU, Fractional anisotropy in the genu of the corpus callosum; FA-PCF, fractional anisotropy in the pericallosal frontal region.

*

p < 0.05.