Table 3.

Correlations between Intersubject Variability in Pericalcarine Cortex Morphology and Fixation Durations for Both Text-reading and Pseudoreading

RegionParameterPearson rpRegression Equation
Gray matter volume (mm3
LH μ −.451 .0155 Y = −0.01498 * X + 187.2
LH σ −.437 .0447 Y = −0.01019 * X + 67.02
Surface area (mm2
LH μ −.577 .0025 Y = −0.02840 * X + 196.5
LH σ −.488 .0132 Y = −0.01932 * X + 73.33
RH μ −.517 .0082 Y = −0.02944 * X + 202.7

Gray matter volume (mm3
LH μ −.416 .0385 Y = −0.02389 * X + 218.1
LH σ −.503 .0103 Y = −0.01578 * X + 85.76
RH μ −.555 .0040 Y = −0.03230 * X + 245.8
RH σ −.554 .0041 Y = −0.01761 * X + 95.05
Surface area (mm2
LH μ −.413 .0400 Y = −0.03732 * X + 221.3
LH σ −.542 .0051 Y = −0.02672 * X + 90.91
RH μ −.583 .0022 Y = −0.06094 * X + 265.0
RH σ −.605 .0013 Y = −0.03453 * X + 107.6
RegionParameterPearson rpRegression Equation
Gray matter volume (mm3
LH μ −.451 .0155 Y = −0.01498 * X + 187.2
LH σ −.437 .0447 Y = −0.01019 * X + 67.02
Surface area (mm2
LH μ −.577 .0025 Y = −0.02840 * X + 196.5
LH σ −.488 .0132 Y = −0.01932 * X + 73.33
RH μ −.517 .0082 Y = −0.02944 * X + 202.7

Gray matter volume (mm3
LH μ −.416 .0385 Y = −0.02389 * X + 218.1
LH σ −.503 .0103 Y = −0.01578 * X + 85.76
RH μ −.555 .0040 Y = −0.03230 * X + 245.8
RH σ −.554 .0041 Y = −0.01761 * X + 95.05
Surface area (mm2
LH μ −.413 .0400 Y = −0.03732 * X + 221.3
LH σ −.542 .0051 Y = −0.02672 * X + 90.91
RH μ −.583 .0022 Y = −0.06094 * X + 265.0
RH σ −.605 .0013 Y = −0.03453 * X + 107.6

Cortical morphology measures are gray matter volume and surface area. LH = left hemisphere; RH = right hemisphere. Parameters are from ex-Gaussian fixation duration distributions for individuals. The p values (two-tailed) are from the F statistic (df = 1,23) for r2 of the best-fitting linear regression equation (also shown).

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