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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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Investigating the interplay between segregation and integration in developing cortical assemblies.

Valerio Barabino1, Ilaria Donati Della Lunga1, Francesca Callegari1

  • 1Department of Informatics, Bioengineering, Robotics and Systems Engineering (DIBRIS), University of Genova, Genova, Italy.

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Researchers developed an in vitro model to study brain network development. They found a critical 10-day window for balancing neural segregation and integration, crucial for optimal network connectivity and function.

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PDMS deviceconnectivitycortical networksintegrationmicro-electrode arrayssegregation

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Area of Science:

  • Neuroscience
  • Biomaterials Science

Background:

  • The human brain relies on a balance between segregation and integration for efficient information processing.
  • Neurological disorders can disrupt this balance, impacting brain function.
  • Understanding this balance is key to developing strategies for connectivity recovery.

Purpose of the Study:

  • To investigate the effects of varying segregation and integration ratios on neural network development over time.
  • To establish a controllable in vitro model for studying neural network organization.
  • To identify optimal conditions for achieving a balance between segregation and integration in developing neural networks.

Main Methods:

  • A cross-shaped polymeric mask was used to create four independent cortical neuron sub-populations in vitro.
  • The timing of mask removal was varied to alter the segregation/integration balance.
  • Morphological and functional network features were assessed using immunofluorescence and micro-electrode arrays (MEAs) from 11 to 18 days in vitro (DIVs).

Main Results:

  • Mask removal timing significantly impacted inter-communication, firing, and bursting parameters.
  • Early mask removal (5 DIVs) led to high integration, similar to control networks.
  • Late mask removal (15 DIVs) resulted in segregated networks with hindered inter-compartment connectivity.

Conclusions:

  • A critical window for achieving balanced segregation and integration was identified around 10 DIVs.
  • Mask removal at 10 DIVs facilitated strong connectivity between initially separated neuronal compartments.
  • This study demonstrates a method to manipulate and study the segregation-integration balance during neural network development.