Does a cognitive map guide choices in the radial-arm maze?

Area of Science:

• Behavioral neuroscience
• Animal cognition

Background:

• The radial-arm maze is a common tool for studying spatial learning and memory in rodents.
• Previous research suggests rats utilize a cognitive map for navigation in this task.

Purpose of the Study:

• To investigate the decision-making processes underlying rat behavior in a radial-arm maze.
• To test the cognitive map theory by analyzing microchoice decisions.

Main Methods:

• Rats (n=15) performed a standard radial-arm maze task and a modified version with forced choices and a retention interval.
• Arm orientation was recorded as go-no-go "microchoice" decisions, alongside standard choice measures.
• A computational model of choice was developed based on independent microchoice decisions.

Main Results:

• Rats frequently investigated and rejected unbaited arms, indicating complex decision-making.
• The developed model, assuming independent microchoices, closely matched rat performance.
• Microchoices were not exclusively guided toward baited arms.

Conclusions:

• Rat choice behavior in the radial-arm maze may not solely rely on a cognitive map.
• Independent microchoice decisions play a significant role in radial-arm maze performance.
• These findings challenge traditional interpretations of spatial navigation in this paradigm.