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1Brown University, Walter S. Hunter Laboratory of Psychology, Providence, RI 02912, USA. donald_blough@brown.edu
Behavioural Processes
|May 12, 2009
Summary
Pigeons showed response bias when stimulus frequency or reinforcement probability was imbalanced. However, reaction times revealed that reinforcement probability imbalance affected speed, suggesting different learning mechanisms for choice and reaction time.
Area of Science:
- Animal behavior
- Cognitive psychology
- Behavioral neuroscience
Background:
- Pigeons can learn to discriminate between colors.
- Response bias can be manipulated through experimental conditions.
- Reaction times provide insights into cognitive processes.
Purpose of the Study:
- To investigate how different types of response bias manipulation affect pigeon behavior.
- To differentiate between instrumental and Pavlovian learning mechanisms in pigeons.
- To examine the impact of stimulus frequency and reinforcement probability on choice and reaction times.
Main Methods:
- Six pigeons were trained to discriminate between blue and green colors.
- Two experiments manipulated response bias using stimulus frequency (SF) and reinforcement probability (RNF) imbalance.
- Choice percentages and reaction times (RTs) were recorded under balanced and imbalanced conditions.
Main Results:
- Imbalanced SF and RNF conditions produced substantial response bias, comparable between the two manipulation types.
- RNF imbalance significantly slowed reaction times for less reinforced stimuli.
- SF imbalance had minimal to no effect on reaction times.
Conclusions:
- Choice behavior appears to be driven by instrumental stimulus-response-reinforcement associations.
- Reaction times are more influenced by Pavlovian stimulus-reinforcement associations.
- Different associative learning mechanisms may underlie choice and reaction time in pigeons.
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