Error message

  • Deprecated function: Creation of dynamic property MergeQuery::$condition is deprecated in MergeQuery->__construct() (line 1357 of /var/www/html/afni-dev/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1887 of /var/www/html/afni-dev/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1887 of /var/www/html/afni-dev/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1887 of /var/www/html/afni-dev/includes/database/query.inc).
  • Deprecated function: Creation of dynamic property DatabaseCondition::$stringVersion is deprecated in DatabaseCondition->compile() (line 1887 of /var/www/html/afni-dev/includes/database/query.inc).

Correlation Analysis (aka functional connectivity)

 

Correlation analysis, more popularly known as functional connectivity, looks for BOLD signal similarity between a seed region (ROI) and the rest of the brain. Be aware of the following limitations when interpreting the results

A. Difference between correlation and causation: The connectivity thus identified is ambiguous with respect to interaction and direction, and does not necessarily indicate direct neuronal connection. 

B. Restriction of voxel-wise correlation with only one seed ROI.

C. No temporal delay is considered.

Two type of correlation analysis: