Which procedure yields a weaker CR when CS and US are presented simultaneously?

Which procedure yields a weaker CR when CS and US are presented simultaneously?

• A. Trace Conditioning
• B. Respondent Acquisition
• C. Spontaneous Recovery
• D. Simultaneous Conditioning

Answer: (D)

In Pavlovian conditioning, how strongly a conditioned response develops depends on how predictively the CS signals the US. When the CS and US occur at the same moment, the CS provides no lead time or advance cue about the US, so the association between them is weak and the conditioned response is very small or absent. The CS isn’t useful for predicting when the US will happen, which undermines learning. In contrast, other timing arrangements allow the CS to predict the US more reliably. Trace conditioning includes a gap between the CS and US, so the organism must maintain a memory of the CS to bridge to the US, yielding some learning (though typically weaker than when the CS precedes the US). Spontaneous recovery refers to the reappearance of a CR after extinction, not to how the CS–US timing affects acquisition. Respondent acquisition is the general process of learning a CR, not a specific timing procedure. So, presenting the CS and US simultaneously yields the weakest CR among these options.

In Pavlovian conditioning, how strongly a conditioned response develops depends on how predictively the CS signals the US. When the CS and US occur at the same moment, the CS provides no lead time or advance cue about the US, so the association between them is weak and the conditioned response is very small or absent. The CS isn’t useful for predicting when the US will happen, which undermines learning.

In contrast, other timing arrangements allow the CS to predict the US more reliably. Trace conditioning includes a gap between the CS and US, so the organism must maintain a memory of the CS to bridge to the US, yielding some learning (though typically weaker than when the CS precedes the US). Spontaneous recovery refers to the reappearance of a CR after extinction, not to how the CS–US timing affects acquisition. Respondent acquisition is the general process of learning a CR, not a specific timing procedure.

So, presenting the CS and US simultaneously yields the weakest CR among these options.