What is connectivity in the brain?
Brain connectivity is operationally defined as the estimation of the relation between brain areas (Regions of interest, ROIs, or Volumes of interest, VOIs); these relations are established when a specific cognitive task is being solved or when resting.
What is graph theory brain?
According to graph theory, structural brain networks can be described as graphs that are composed of nodes (vertices) denoting neural elements (neurons or brain regions) that are linked by edges representing physical connections (synapses or axonal projections).
What is graph theory neuroimaging?
Graph theory-based approaches model the brain as a complex network represented graphically by a collection of nodes and edges. In the virtual graph, nodes indicate anatomical elements (e.g., brain regions), and edges represent the relationships between nodes (e.g., connectivity).
What happens to us when our brain is at the default mode?
Thus, the default mode network is a group of brain regions that seem to show lower levels of activity when we are engaged in a particular task such as paying attention, but higher levels of activity when we are awake and not involved in any specific mental exercise.
How is graph theory used in neuroscience?
In neuroscience, we often use graph theory as a tool to study how different parts of the brains (nodes) are functionally connected to each other. We’ll be focusing on using undirected graphs (or “static” graphs, as they’re more often called in neuroscience) to model functional brain connectivity.
Where in the brain is the default mode network?
Areas of the brain included in the default mode network include the medial temporal lobe, the medial prefrontal cortex, and the posterior cingulate cortex, as well as the ventral precuneus and parts of the parietal cortex. All of these regions have been associated with some aspect of internal thought.
What is neuro variability?
• Excessive neural variability is apparent in autism and other disorders. Although we may not realize it, our brain function varies markedly from moment to moment such that our brain responses exhibit substantial variability across trials even in response to a simple repeating stimulus.
Is the brain of network?
It is often said that the brain is the most complex network known to man. A human brain comprises about 100 billion (1011) neurons connected by about 100 trillion (1014) synapses, which are anatomically organized over multiple scales of space and functionally interactive over multiple scales of time.