Reward motivation influences response bias on a recognition memory task

Area of Science:

• Cognitive Neuroscience
• Psychology
• Neuroeconomics

Background:

• Reward-motivated memory research often uses paradigms with a single false alarm rate, limiting analysis of memory components.
• Previous studies show higher recognition accuracy for high-reward items, but the underlying mechanisms are unclear.

Purpose of the Study:

• To investigate how reward anticipation influences memory discriminability and response bias.
• To develop a novel paradigm allowing separate calculation of hit and false alarm rates for reward-associated categories.

Main Methods:

• Developed a new recognition memory paradigm associating rewards with indoor/outdoor scene categories.
• Varied reward and penalty structures across three experiments to analyze hit rates, false alarm rates, discriminability (d-prime), and response bias.

Main Results:

• Replicated higher hit rates for high-reward items in two experiments.
• Found no significant difference in memory discriminability (d-prime) across reward levels in all three experiments.
• Identified reward-dependent response bias, which became more conservative for low-reward items and was modulated by experimental design.

Conclusions:

• Reward motivation significantly impacts response bias, a decision-making process, rather than objective memory discriminability.
• Experimental design, including reward and penalty structures, is crucial for accurately studying motivation-cognition interactions.