MECHANISM AND ECHO TIME-DEPENDENCE OF THE FAST-RESPONSE IN FMR

The fast response (FR) is an early reduction in the amplitude of the f MR signal occurring shortly after the onset of stimulation. Owing to i ts potential advantages in terms of temporal and spatial resolution, i t may be of considerable significance in functional experiments, A mod el for the mechanism of the FR was developed which accounts for the fM RS finding that the amplitude of the dip decreases with increasing ech o time, Two computer simulations that confirmed the predictions of the model and showed that it is possible to select optimal echo times for the detection of the FR were performed.