There's something about a pattern: Choice between pattern and random sequences in implicit learning

Area of Science:

• Cognitive Psychology
• Animal Behavior
• Behavioral Neuroscience

Background:

• Organisms often encounter sequences of events in their environment.
• Understanding preferences for predictable versus unpredictable stimuli is key to learning and decision-making.
• Previous research has explored sequence learning and reinforcement, but direct comparisons of pattern versus random sequences under controlled conditions are limited.

Purpose of the Study:

• To investigate the preference of male Silver King rats for pattern sequences compared to random sequences.
• To determine if this preference changes based on reinforcement schedules.
• To explore the role of predictability and information in sequence selection.

Main Methods:

• Three experiments utilized touchscreen-presented visual image sequences (pattern vs. random).
• A forced-choice phase equated performance on both sequence types.
• A free-choice phase allowed rats to select between pattern and random sequences under varying reinforcement probabilities.

Main Results:

• In free-choice, rats significantly preferred pattern sequences (70% of trials) when reinforcement was equated.
• When random sequences offered 50% higher reinforcement, rats chose them 83% of the time.
• Performance equalization in the forced-choice phase suggests the preference in free-choice was not due to inherent sequence difficulty.

Conclusions:

• Rats exhibit a preference for pattern sequences when predictability is the primary factor.
• This preference is malleable and can be overridden by differential reinforcement, indicating a strategic decision-making process.
• The findings suggest that the perceived informational value of predictable patterns, beyond direct reinforcement, influences choice behavior.