Related Experiment Video
Updated: May 22, 2026

Experience-Dependent Remodeling of Juvenile Brain Olfactory Sensory Neuron Synaptic Connectivity in an Early-Life Critical Period
Published on: March 1, 2024
Sensory experience restructures thalamocortical axons during adulthood.
Marcel Oberlaender1, Alejandro Ramirez, Randy M Bruno
1Digital Neuroanatomy, Max Planck Florida Institute, Jupiter, FL 33458, USA.
The adult brain remains adaptable, with thalamocortical (TC) inputs showing significant plasticity. Sensory experience alters the total number of TC synapses, challenging long-held beliefs about brain rewiring limitations.
Area of Science:
- Neuroscience
- Neuroplasticity
- Brain Development
Background:
- The brain's capacity to rewire is believed to decrease with age.
- Adult experience is thought to modify only cortical neuron synaptic connections.
Purpose of the Study:
- To investigate whether thalamocortical (TC) inputs exhibit plasticity in adult brains.
- To determine how sensory experience impacts TC connections in adult rats.
Main Methods:
- Whole-cell recording from individual thalamocortical neurons in adult rats.
- Utilized automatic tracing techniques to reconstruct individual axonal trees.
- Implemented whisker trimming as a sensory manipulation.
Main Results:
- Whisker trimming significantly reduced TC axon length in the barrel cortex.
- The density of TC synapses along individual fibers remained unchanged.
- Sensory stimulation resulted in more tightly time-locked responses in layer 4 cortical neurons post-trimming.
Conclusions:
- Thalamocortical inputs demonstrate substantial plasticity in adult brains.
- Sensory experience directly alters the total number of TC synapses.
- This plasticity suggests that subcortical structures may remain adaptable throughout life.
More Related Videos
06:16Visualization of Thalamocortical Axon Branching and Synapse Formation in Organotypic Cocultures
Published on: March 28, 2018
06:05Modification of a Colliculo-thalamocortical Mouse Brain Slice, Incorporating 3-D printing of Chamber Components and Multi-scale Optical Imaging
Published on: September 18, 2015
Related Concept Videos
Somatosensation
Olfactory Receptors: Location and Structure
Major Somatic Sensory Pathways
Overview of Somatic Sensory Pathways
The somatosensory system is divided into three main pathways: the dorsal (or posterior) column-medial lemniscus, spinothalamic (or anterolateral), and spinocerebellar pathways.
The dorsal...
Neuroplasticity
Somatosensory, Motor, and Association Cortex