Which form of forward conditioning has the CS precede the UCS with no overlap?

• A. Delay conditioning
• B. Simultaneous conditioning
• C. Trace conditioning
• D. Backward conditioning

Answer: (C)

Understanding how timing between the conditioned stimulus and the unconditioned stimulus shapes learning is key here. In trace conditioning, the CS is presented and ends before the UCS appears, with a clear gap and no overlap between them. That gap forces the learner to maintain a memory trace of the CS so it can be associated with the upcoming UCS, which is why this form is characterized by the CS preceding the UCS with a pause in between. This differs from delay conditioning, where the CS continues into the period of the UCS or ends together with it, creating strong temporal contiguity; from simultaneous conditioning, where both occur at the same time; and from backward conditioning, where the UCS comes first and the CS follows. So trace conditioning matches the idea of a preceding cue that is separated in time from the outcome, linked by a memory trace rather than by immediate temporal overlap.