Self-control revisited: Some factors that affect autoshaped responding.

Area of Science:

• Behavioral neuroscience
• Animal cognition
• Learning and memory

Background:

• Autoshaping procedures are used to study associative learning in animals.
• Pigeons (Columba livia) are common subjects in behavioral experiments due to their cognitive abilities.

Purpose of the Study:

• To investigate how pigeons value food rewards under different temporal conditions.
• To determine the influence of stimulus duration and delay on reward preference.

Main Methods:

• Pigeons were exposed to autoshaping with differential key illumination durations and food delivery times.
• Key stimuli (red and blue) were associated with varying food delivery schedules.
• Stimulus duration and inter-stimulus intervals were manipulated to assess preference shifts.

Main Results:

• Pigeons initially preferred stimuli associated with longer food deliveries (9-sec vs. 3-sec).
• Preference shifted to the blue stimulus when the red stimulus duration increased or a delay was introduced.
• Preference for longer, delayed rewards increased with overall stimulus duration in most subjects.

Conclusions:

• Pigeon reward valuation is sensitive to both reward magnitude and temporal factors like delay and stimulus duration.
• These findings in non-contingent procedures mirror results from response-dependent procedures, suggesting robust associative learning.
• The study highlights the complexity of associative learning and reward valuation in avian models.