Working Memory, Cognitive Load and Cardiorespiratory Fitness: Testing the CRUNCH Model with Near-Infrared Spectroscopy

Figures

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  Figure 1. Mean hemodynamic activity as a function of cognitive load, age and hemisphere. (A) = Young adults; (B) = High-fit older adults; (C) = Low-fit older adults. The colored frames on the curves correspond to the standard error of the mean. On the x axe, 0 corresponds to the start of the task + 10 s. and 140 correspond to the end of the task (see text).

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  Figure 2. Hemodynamic concentration changes in prefrontal cortex (PFC) of young adults and older adults as a function of cognitive load (A = 1–0-back; B = 2–0-back; C = 3–0-back in young adults and D = 1–0-back; E = 2–0-back; F = 3–0-back in older adults) and hemisphere. Bars represent standard error.

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  Figure 3. Hemodynamic concentration changes in prefrontal cortex (PFC) in low-fit and high-fit older adults as a function of cognitive load (A = 1–0-back; B = 2–0-back; C = 3–0-back). Bars represent standard error.

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  Figure 4. Scatter plots of the robust regressions where {O2Hb} in the left PFC predicted behavioral performance in young adults (A) and high-fit older adults (B) during the 3-back condition. The grey frame represents the 95% confidence intervals.