Scaling of events spaced in time.

Area of Science:

• Behavioral Psychology
• Animal Cognition
• Operant Conditioning

Background:

• Pigeons were trained on a key-pecking task with differential reinforcement schedules.
• Food rewards were contingent on specific numbers of feeder-light stimuli presented after key presses.
• A changeover key controlled the transition between different stimulus conditions (red and green key lights).

Purpose of the Study:

• To investigate how pigeons adjust their behavior based on temporal and response-contingent cues.
• To determine the factors influencing the pigeons' decision to switch from a red to a green key light.
• To explore the role of multiple stimulus control sources in operant behavior.

Main Methods:

• Pigeons were trained to peck a key under red light, receiving food after the 4th feeder flash.
• If food was not delivered, pigeons could peck a changeover key to switch to green light, where food followed the 16th flash.
• Variable-interval schedules were manipulated to alter the time and response requirements between feeder-light events.

Main Results:

• Pigeons typically responded on the red key until at least four flashes occurred.
• The decision to switch to the green key was influenced by the number of feeder-light events.
• Crucially, the switch was also affected by the elapsed time and the number of responses emitted since the trial's start.

Conclusions:

• Pigeon's choice behavior is not solely based on the number of events but also on temporal factors and response output.
• This suggests that pigeons utilize multiple, integrated sources of information for stimulus control.
• The findings highlight the complexity of decision-making processes in animals when events unfold over time.