INS and dementia: In order to apply the insulin secretion test, physicians, after assessing the basal value parameters of the above-described reflexes, immediately thereafter stimulates by lasting pinching the skin of VI thoracic dermathomere for 15 s, repeating the evaluation of the identical reflexes: in both health and patients involved by senile dementia, vascular in origin or mixed, the test improves “always” the numerous parameters mentioned above, although in different manner.