In delay conditioning the CS is presented and remains on until the US is presented, whereas in trace conditioning
a silent interval (the trace interval) is interposed between CS termination and US onset.
Because the conditioned stimulus (CS) is terminated prior to the unconditioned stimulus (US), taste-aversion conditioning is defined as a type of trace conditioning.
Trace conditioning with X-rays as an aversive stimulus.
During trace conditioning
, significant activity to CS+ versus CS- was found in the anterior portion of the vermis cerebelli, putamen, and the inferior parietal cortex.