Conditioned [corrected] stimulus informativeness governs conditioned stimulus-unconditioned stimulus associability.

Area of Science:

• Behavioral neuroscience
• Learning and memory
• Animal behavior

Background:

• Conditioning protocols utilize conditioned stimuli (CS) to signal reinforcement (unconditioned stimulus, US).
• In delay conditioning, CS onset provides information about the timing of the upcoming US.
• Two key information sources are CS informativeness and temporal interval representation precision.

Purpose of the Study:

• To investigate the differential impact of CS informativeness versus temporal precision on conditioned responding acquisition.
• To determine how these factors influence CS-US associability in mice.

Main Methods:

• Three experiments were conducted using mice in a delay conditioning paradigm.
• Varied the informativeness of the CS (degree to which CS onset reduces expected time to US onset).
• Manipulated the precision of temporal interval representation (temporal Weber fraction) and CS-US interval duration.

Main Results:

• Conditioned responding acquisition rate (associability) increased proportionally with CS informativeness.
• Fixing the duration of the US-US interval or the CS-US interval did not affect associability.
• Equating information increase from C/T ratio and fixed CS-US duration confirmed informativeness drives associability.

Conclusions:

• CS-US associability is primarily driven by the increased rate of reward signaled by CS onset (informativeness).
• The precise representation of fixed temporal intervals plays a lesser role in the rate of conditioned responding acquisition.
• Conditioned responding emerges as a temporally controlled behavior, influenced by predictive informational cues.