Question

What is cortex parcellation?

Answer 1

The brain's spatial domain is divided into a group of non-overlapping sections or modules that show some homogeneity in terms of information provided by one or more imaging modalities, such as cytoarchitecture, anatomical connection, functional connectivity, or task-related activation.

Complete answer:
The cortex is divided into numerous cortical sections that help us understand how the brain works. The brain parcellation is the final partitioning of the cortex into areas.
Parcellation is involved in-
allowing for efficient result comparison.
Making a map of where things happen in the brain.
Reduce the amount of data complexity available for neuroimaging analysis.
The FreeSurfer gives a neuroanatomical label to each point on a cortical surface model based on probabilistic information derived from a manually labelled training set, which is known as cortical parcellation.
Understanding brain organisation and function requires distinguishing discrete partitions in the brain, whether they are areas or networks that incorporate numerous discontinuous but tightly interacting regions.
In vivo MRI-based approaches to identify and parcellate the brain on the basis of a variety of variables, ranging from local qualities of brain tissue to long-range connectivity patterns, in addition to anatomical and functional indicators, have exploded in popularity over the last decade.

Note:
pyClusterROI is a collection of Python scripts for generating whole-brain parcellations from functional magnetic resonance imaging (fMRI) data. The produced regions are acceptable for use as regions of interest (ROIs) in the analysis of fMRI data.
Ward's clustering outperforms competing methods in terms of reproducibility and accuracy in general, while the two criteria diverge in terms of preferred models (reproducibility leads to more conservative solutions), deferring a practical decision to a higher level option.