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  • Title: Effects of tryptophan depletion on Poggendorff illusion, corner Poggendorff illusion, and attention.
    Author: Antonietti A, Pascarella A, Masini R, Moja EA.
    Journal: Percept Mot Skills; 1991 Jun; 72(3 Pt 1):895-8. PubMed ID: 1891327.
    Abstract:
    The effects of a tryptophan-free amino acid mixture on Poggendorff illusion, corner Poggendorff illusion, and attention were investigated with 12 male subjects who ingested either a balanced amino acid mixture or a tryptophan-free mixture, the latter known to cause a marked depletion of brain tryptophan and serotonin. No significant difference between the two mixtures on the perceptual illusions was found.
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