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. Author manuscript; available in PMC: 2011 Aug 6.
Published in final edited form as: Vision Res. 2010 May 16;50(17):1628–1640. doi: 10.1016/j.visres.2010.05.003

Figure 5.

Figure 5

Structural Equation Model which uses four of the temporal order tasks as manifest measures to estimate two latent temporal order factors (labeled Same Location and Different Location). These are latent dependent variables which are predicted by the Temporal Contrast Threshold and Speed of Processing latent independent variables, each of which is estimated by several manifest measures. In addition, letter contrast threshold is a manifest variable that is used as a predictor for the latent dependent variables. For clarity, the error terms on each manifest variable are not shown. In addition, the two temporal order latent factors have disturbances which are correlated. Single-headed arrows are regression weights, and double-headed arrows are correlations. Paths that have significant regression weights or correlations at the 0.01 level are shown in black; grey paths are not significant. This model demonstrates a significant contribution of Speed of Processing (as measured by three WAIS subtests) to both temporal order latent factors, while Letter Contrast Threshold has a significant relation with only the Different Location latent factor. The Temporal Contrast Threshold factor correlated with other measures but did not contribute significantly to either latent temporal factor. See text for more information.