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Neural Adaptation
  • Invertebrate
  • Grade 6+

Neural Adaptation – How Neurons Ignore Constant Stimuli

Ever noticed how quickly you stop feeling your clothes or glasses once you put them on? This experiment explores neural adaptation by showing how sensory neurons reduce their firing rate over time in response to constant, unchanging stimulation.

Devices and Accessories2

About the Experiment

What Will You Learn?

What Will You Learn?

  • How sensory neurons decrease their response to constant stimuli.
  • Techniques for recording and analyzing neural adaptation.
  • Insights into early sensory processing, and how adaptation differs from learning (habituation).
Background

Background

Neural adaptation helps sensory systems filter out constant or redundant input. When a stimulus is first applied, sensory neurons respond vigorously, but their activity fades as the input persists. This adaptation allows the brain to focus on what’s new and relevant. In this experiment, you’ll record from a cockroach leg to directly visualize this dynamic.

Procedure

  1. Preparation:

    Preparation:

    1. Anesthetize a cockroach briefly and remove one leg: grip it firmly at the femur and pull it off in one quick, fast motion so it separates cleanly at the joint. A slow pull can drag internal tissue out with the leg and harm the cockroach.
    2. Secure the leg onto a stable platform (e.g., cork or balsa wood).

  2. Electrode Placement:

    1. Insert two electrode pins into an area with abundant sensory hairs.
    2. Push the pins in far enough that they stay put—no gel is needed, and keep the leg surface dry between the pins.

  3. Baseline Recording:

    1. Connect the electrodes to the Neuron SpikerBox.
    2. Record neural activity before applying any stimulus.

  4. Sustained Stimulation:

    1. Apply constant gentle pressure to a sensory hair using a toothpick or probe.
    2. Observe the strong initial neural response, followed by a gradual reduction in spike frequency.
Results & Analysis

Results & Analysis

Quantify how neural activity declines over time in response to a sustained stimulus. Measure the time it takes for the spike rate to reduce by half from its initial peak. This drop illustrates neural adaptation in real time.

NGSS alignment

Performance expectations

The nervous system filters constant input while staying alert to change.

  • MS-LS1-8 Gather and synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.

  • HS-LS1-2 Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.

Science and engineering practices

  • 3 Planning and Carrying Out Investigations

    Apply constant pressure to a sensory hair while recording.

  • 4 Analyzing and Interpreting Data

    Track the strong first response and the gradual fall in spike rate.

  • 5 Using Mathematics and Computational Thinking

    Measure the time for the spike rate to fall to half its peak.

Crosscutting concepts

  • Patterns

    Firing declines predictably.

  • Cause and Effect

    Sustained input drives adaptation.

Disciplinary core ideas

  • LS1.D Information Processing

    Processing filters ongoing input.

Performance expectations, crosscutting concepts and core ideas from Hands-On Neuroscience Curriculum Overview, Unit 1, module 1.3, whose core lab this is. The practices are the ones this page asks students to do.