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Updated: Jun 29, 2025
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In Vivo Calcium Imaging of Neuronal Ensembles in Networks of Primary Sensory Neurons in Intact Dorsal Root Ganglia
Published on: February 10, 2023
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Cortical cellular encoding of thermotactile integration.
Philipp Schnepel1, Ricardo Paricio-Montesinos1, Ivan Ezquerra-Romano2
1Max-Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin-Buch, Robert-Rössle-Strasse 10, 13125 Berlin, Germany; Neuroscience Research Center, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany.
Current Biology : CB
|April 6, 2024
Summary
Simultaneous cool and touch stimuli enhance perception. Primary somatosensory cortex (fS1) neurons show altered responses, integrating thermal and tactile inputs for improved sensory detection.
Area of Science:
- Neuroscience
- Sensory processing
- Somatosensation
Background:
- Primary sensory cortical regions are increasingly recognized for multisensory integration.
- Understanding how individual neurons integrate diverse sensory inputs, especially weak or modulatory ones, remains a challenge.
Purpose of the Study:
- To investigate the neural mechanisms underlying thermotactile integration in the primary somatosensory cortex (fS1).
- To determine how simultaneous thermal and tactile stimuli affect neuronal responses and perception.
Main Methods:
- In vivo extracellular recordings from mouse fS1 during a thermotactile detection task.
- Stimulation involved unimodal (thermal or tactile) and bimodal (thermotactile) inputs to the forepaw in awake and anesthetized mice.
Main Results:
- Perception of threshold-level thermal or tactile stimuli improved with simultaneous presentation.
- Combined thermotactile stimulation recruited previously unresponsive neurons and induced non-linear integration.
- Neuronal responses showed altered dynamics, including longer durations and additional spikes.
Conclusions:
- fS1 neurons exhibit complex integration of thermal and tactile information.
- These neural changes in cortical encoding likely contribute to enhanced perception of thermotactile surfaces during exploration.
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