TABLE 3.

Subject‐level specifications (Hypotheses 1 and 2 tests)

Dep var: Avg accuracy ∈ [0,1]	All trials (20 trials per subject)		Hard trials (14 trials per subject)		Easy trials (six trials per subject)
Variable	(1) Coef (SE) [P‐value]	(2) Coef (SE) [P‐value]	(3) Coef (SE) [P‐value]	(4) Coef (SE) [P‐value]	(5) Coef (SE) [P‐value]	(6) Coef (SE) [P‐value]
Constant	0.768 (.008) [.000]	0.730 (.040) [.000]	0.756 (.008) [.000]	0.700 (.045) [.000]	0.796 (0.009) [.000]	0.800 (0.045) [.000]
No Sugar Diet (=1)	−0.033 (.011) [.003]	−0.023 (.012) [.050]	−0.035 (.013) [.006]	−0.022 (.013) [.089]	−0.029 (.012) [.016]	−0.024 (.013) [.071]
Medit Diet (=1)	0.0197 (.011) [.068]	−0.014 (.011) [.190]	−0.024 (.013) [.054]	−0.017 (.012) [.162]	−0.011 (.012) [.372]	−0.007 (.012) [.548]
Veggie Diet(=1)	−0.0125 (.011) [.255]	−0.008 (.012) [.531]	−0.017 (.012) [.180]	−0.009 (.014) [.510]	−0.003 (.012) [.819]	−0.004 (.014) [.754]
Age	‐	−0.001 (.001) [.145]	‐	−0.001 (.001) [.188]	‐	−0.001 (.001) [.223]
Female (=1)	‐	−0.008 (.008) [.316]	‐	−0.015 (.010) [.109]	‐	0.007 (.010) [.434]
CRT score	‐	0.010 (.002) [.000]	‐	0.011 (.002) [.000]	‐	0.008 (.002) [.000]
Stick to Diet	‐	0.001 (.002) [.571]	‐	0.001 (.003) [.593]	‐	0.001 (.003) [.672]
Supplements (=1)	‐	0.007 (.008) [.440]	‐	0.009 (.010) [.364]	‐	0.002 (.010) [.873]
Last Week Sleep level	‐	−0.0002 (0.003) [.935]	‐	0.001 (.004) [.772]	‐	−0.003 (.004) [.360]
Sleepiness	‐	0.003 (0.002) [.115]	‐	0.004 (.002) [.073]	‐	0.001 (.002) [.651]
N	412	412	412	412	412	412
R 2	.0224	.1112	.0194	.1119	.0170	.0548

Note: P‐values given are for two‐tailed tests (one‐tailed tests appropriate for preregistered hypotheses).

Abbreviation: SE = standard errors.