# Project 1: Neural Basis of Muscle Action Loops

> **NIH NIH U19** · CALIFORNIA INSTITUTE OF TECHNOLOGY · 2020 · $668,460

## Abstract

Project 1: The Neural Basis of Muscle Action Loops
Abstract
The goal of Project 1 is to identify neural mechanisms of sensorimotor processing within low-level
muscle action loops that control walking and flight behavior. Acting at the interface between the
nervous system and the body, muscle action loops face a daunting set of demands: they must operate
with both speed and precision, while retaining the flexibility and robustness necessary to function in
diverse, unpredictable environments. To understand how motor control circuits balance these demands
to control adaptive behavior, we will combine cell-type specific genetic tools with electrophysiology,
functional imaging, and behavioral analysis in the fly. We will first investigate how activity within
diverse populations of motor neurons interacts to produce muscle contraction and complex body
movements. We will then ask how proprioceptive feedback signals are integrated with ongoing motor
commands to adapt and refine behavioral output. Finally, we will work to understand how low-level
muscle action loops interact with descending neuromodulatory signals to generate patterned motor
activity. These experimental and theoretical efforts are divided into the following Specific Aims:
Specific Aim 1: Investigate how motor neurons robustly control body movement.
Specific Aim 2: Determine the role of proprioceptive feedback in fine-tuning precise
motor output.
Specific Aim 3: Identify origins and mechanisms of sensorimotor neuromodulation that
contribute to flexible locomotor behavior.

## Key facts

- **NIH application ID:** 9971618
- **Project number:** 5U19NS104655-04
- **Recipient organization:** CALIFORNIA INSTITUTE OF TECHNOLOGY
- **Principal Investigator:** John Tuthill
- **Activity code:** U19 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2020
- **Award amount:** $668,460
- **Award type:** 5
- **Project period:** — → —

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/9971618

## Citation

> US National Institutes of Health, RePORTER application 9971618, Project 1: Neural Basis of Muscle Action Loops (5U19NS104655-04). Retrieved via AI Analytics 2026-05-23 from https://api.ai-analytics.org/grant/nih/9971618. Licensed CC0.

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