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Related Experiment Video

Updated: Jun 14, 2026

A Fully Automated Rodent Conditioning Protocol for Sensorimotor Integration and Cognitive Control Experiments
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FixGrower: An efficient and robust curriculum for shaping fixation behavior in rodents.

Jessica R Breda1, Julie A Charlton1,2, Jovanna M Willock1,2

  • 1Princeton Neuroscience Institute, Princeton University, Princeton NJ, USA.

Biorxiv : the Preprint Server for Biology
|September 26, 2025
PubMed
Summary

FixGrower is a new, standardized protocol for training rodents in center-port fixation. This method significantly reduces training time and data loss from motor errors, accelerating neuroscience research.

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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.