FixGrower: An efficient and robust curriculum for shaping fixation behavior in rodents

Area of Science:

• Neuroscience
• Behavioral Psychology
• Animal Cognition

Background:

• Center-port fixation is crucial for freely-moving rodent tasks in neuroscience and psychology.
• Current training protocols are often inefficient and lack standardization.
• Motor errors, or 'violations,' during fixation lead to significant data loss.

Purpose of the Study:

• To develop and validate FixGrower, a standardized and efficient protocol for center-port fixation training in rodents.
• To reduce training time and minimize data loss associated with fixation violations.
• To assess the generalizability of the FixGrower protocol across species and task complexities.

Main Methods:

• FixGrower implements a longer initial fixation requirement.
• It customizes fixation duration at session boundaries based on individual animal performance.
• Penalties for violations are introduced only at the end of the training period.

Main Results:

• FixGrower reduced training time by 61% compared to traditional methods.
• The protocol resulted in significantly lower rates of fixation violations.
• The training curriculum demonstrated effectiveness across different rodent species and task difficulties.

Conclusions:

• FixGrower offers an efficient and standardized approach to rodent fixation training.
• The protocol's success is supported by operant conditioning and reinforcement learning principles.
• This method accelerates the training process for numerous rodent-based experimental tasks.