Effects of acute tryptophan depletion on executive function in healthy male volunteers.

BMC Psychiatry · 2003 · PMC184453 · PMID 12895276

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did not reach statistical significanceno p-value reported

Perseverative errors were also lower ( z = -1.719, P = 0.086) and conceptual level responses higher ( z = -1.334, P = 0.182) although these results did not reach statistical significance (see figure 1 ).

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