Flavonoid-Rich Mixed Berries Maintain and Improve Cognitive Function Over a 6 h Period in Young Healthy Adults.

This main effect was qualified by an intervention x session interaction trend (F(2400) = 2.472, p = 0.086) along with a trend towards significance for session (F(2400) = 2.92, p = 0.055).

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As shown in Figure 5 b post hoc analysis of the intervention x switch trial interaction revealed that for placebo there was a significant difference between S0 and S1 ( p = 0.004), S2 ( p = 0.027) and S3 ( p = 0.012), however following the berry intervention there was only a significant difference between S0 and S3 ( p = 0.016), and a weak trend between S0 and S1 ( p = 0.084) indicating less evidence of a cognitive demand related switching cost (i.e., the difference between the S0 trial immediately following task switch and the following S1, S2, and S3 non-switch trials).

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Contrary to our hypotheses, though positive affect was higher for blueberry than placebo at 2 h following intervention, this finding failed to reach significance.

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