Prospective Monocentric Study of Taste in Patients With Minor or Major Cognitive Disorders Such as Alzheimer's, Through the Analysis of Gustatory Evoked Potentials.

Fasting blood glucose, dosage of acylated and non-acylated ghrelin, leptin, insulin and serotonin.

QPC Cognitive complaint questionnaire, CDR functional autonomy scales and IADL 4 items, MMSE cognitive scores, Dubois 5-word test, clock test, BREF, Isaacs test, BARD naming battery and MADRS depression scale

Scales of taste perceptive intensity, taste pleasure, hunger sensation (visual analogue scales from 0 to 10 cm) and food preferences on the one hand, and on the other hand, subjective tests of taste threshold determination by triangular tests of increasing sugar solution concentrations.

Recording of gustatory evoked potentials