Time estimation by pigeons on a fixed interval: the effect of pre-feeding

Area of Science:

• Behavioral Neuroscience
• Animal Cognition
• Operant Conditioning

Background:

• Pigeons trained on fixed interval schedules exhibit predictable response patterns.
• The peak procedure is commonly used to assess interval timing in animals.
• Investigating factors that influence timing behavior is crucial for understanding cognitive processes.

Purpose of the Study:

• To examine the effect of pre-feeding on pigeon responding under a peak procedure.
• To determine if pre-feeding alters the temporal accuracy of interval timing.
• To evaluate the validity of peak time as a pure measure of timing.

Main Methods:

• Pigeons were trained on a fixed interval 10-s schedule.
• A successive conditions design was employed, with pigeons either pre-fed or not before testing.
• Response rates and peak response times were recorded under both conditions.

Main Results:

• Pre-feeding significantly decreased the overall rate of responding.
• The time of maximum response rate (peak time) was delayed by 2-3 seconds in the pre-fed condition compared to controls.
• Control conditions showed peak responding at the typical time of reinforcement.

Conclusions:

• Pre-feeding influences both the rate and the temporal distribution of responding in pigeons.
• The observed shift in peak time suggests that motivational state (influenced by pre-feeding) can affect timing measures.
• Peak time may not solely reflect an internal timing mechanism but can be modulated by external factors.