Trace conditioning is characterized by:

Trace conditioning is characterized by:

• A. The CS and UCS occur sequentially with a gap between them.
• B. They occur at exactly the same time and end together.
• C. The CS overlaps with the UCS for a period.
• D. The UCS precedes the CS with a long delay.

Answer: (A)

Trace conditioning centers on a time gap between the CS and the UCS. The CS is presented and ends, then after a brief silent interval the UCS is delivered. The key idea is that the organism must maintain a memory of the CS during that gap in order to form an association with the UCS once it appears. This is why the description describing the CS and UCS as occurring sequentially with a gap between them is the correct characterization. Think of other patterns as contrasts: simultaneous conditioning happens when the CS and UCS occur together in time; delay (overlapping) conditioning is when the CS overlaps with the UCS and the UCS occurs while the CS is still present; backward conditioning is when the UCS comes before the CS, sometimes with a long delay, which is a different setup.

Trace conditioning centers on a time gap between the CS and the UCS. The CS is presented and ends, then after a brief silent interval the UCS is delivered. The key idea is that the organism must maintain a memory of the CS during that gap in order to form an association with the UCS once it appears. This is why the description describing the CS and UCS as occurring sequentially with a gap between them is the correct characterization.

Think of other patterns as contrasts: simultaneous conditioning happens when the CS and UCS occur together in time; delay (overlapping) conditioning is when the CS overlaps with the UCS and the UCS occurs while the CS is still present; backward conditioning is when the UCS comes before the CS, sometimes with a long delay, which is a different setup.