Second-order schedules with paired auditory brief stimuli

Area of Science:

• Behavioral psychology
• Animal cognition
• Operant conditioning

Background:

• Second-order schedules involve complex stimulus control.
• Pigeons' ability to discriminate stimuli is crucial for understanding learning.
• Prior research focused on visual stimuli; auditory stimuli require further investigation.

Purpose of the Study:

• To investigate pigeons' discrimination of auditory stimuli in second-order schedules.
• To examine the effect of the number of schedule segments on response rates.
• To compare auditory and visual stimuli in second-order conditioning.

Main Methods:

• Pigeons were exposed to second-order schedules with paired and unpaired auditory stimuli.
• A fixed-interval thirty-second schedule was used for main-key reinforcement.
• Experiment 1 required a response during the final stimulus; Experiment 2 varied the number of schedule segments.

Main Results:

• Pigeons showed comparable responding during all auditory stimuli, indicating discrimination.
• Main-key response rates increased across segments, but less sharply with variable segments.
• Paired auditory stimuli led to higher response rates than unpaired visual stimuli.

Conclusions:

• Pigeons can discriminate between successive presentations of auditory stimuli in second-order schedules.
• Temporal discrimination, not just stimulus change, drives increased response rates across segments.
• Auditory stimuli are effective in second-order schedules, extending previous findings with visual stimuli.