Which form of forward conditioning has the onset of the UCS while the CS is still present?

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

Answer: (D)

This question tests how the timing of the unconditioned stimulus relates to the conditioned stimulus in forward conditioning. When the unconditioned stimulus begins while the conditioned stimulus is still present, the two stimuli overlap in time. This overlap is the defining feature of delayed conditioning, where the CS starts first and the US occurs while the CS is ongoing, making the CS a strong predictor of the impending US.

In contrast, trace conditioning has a gap between the end of the CS and the start of the US, simultaneous conditioning has them starting at the same time with no lead, and backward conditioning has the US precede the CS.