An increase in strength of tilt aftereffect associated with tryptophan depletion.
The effects of a tryptophan-free amino acid mixture on tilt aftereffect, movement aftereffect, and the Mueller-Lyer illusion were studied. 12 male subjects ingested either a balanced amino acid mixture or a tryptophan-free mixture which causes a marked depletion of brain tryptophan and serotonin. The tryptophan-free mixture significantly increased the strength of tilt aftereffect but had no effect on movement aftereffect or the Mueller-Lyer illusion. These results were discussed with reference to the pharmacological activity of serotonin and its influence on the strength of lateral inhibition in mammalian brains.
Masini
R
R
Institute of Psychology, University of Milano, Italy.
Antonietti
A
A
Moja
E A
EA
D000328:Adult; D001288:Attention / Q000502:physiology; D001921:Brain / Q000502:physiology; D005366:Figural Aftereffect / Q000502:physiology*; D006801:Humans; D007088:Illusions / Q000502:physiology*; D008297:Male; D009039:Motion Perception / Q000502:physiology; D009903:Optical Illusions / Q000502:physiology*; D009949:Orientation / Q000502:physiology*; D012701:Serotonin / Q000502:physiology*; D014364:Tryptophan / Q000172:deficiency*
D012701:Serotonin; D014364:Tryptophan