Cognitive Processing

, Volume 7, Issue 1, pp 42–52

A new method for detecting causality in fMRI data of cognitive processing

  • Alessandro Londei
  • Alessandro D‘Ausilio
  • Demis Basso
  • Marta Olivetti Belardinelli
Research Report

DOI: 10.1007/s10339-005-0019-5

Cite this article as:
Londei, A., D‘Ausilio, A., Basso, D. et al. Cogn Process (2006) 7: 42. doi:10.1007/s10339-005-0019-5

Abstract

One of the most important achievements in understanding the brain is that the emergence of complex behavior is guided by the activity of brain networks. To fully apply this theoretical approach fully, a method is needed to extract both the location and time course of the activities from the currently employed techniques. The spatial resolution of fMRI received great attention, and various non-conventional methods of analysis have previously been proposed for the above-named purpose. Here, we briefly outline a new approach to data analysis, in order to extract both spatial and temporal activities from fMRI recordings, as well as the pattern of causality between areas. This paper presents a completely data-driven analysis method that applies both independent components analysis (ICA) and the Granger causality test (GCT), performed in two separate steps. First, ICA is used to extract the independent functional activities. Subsequently the GCT is applied to the independent component (IC) most correlated with the stimuli, to indicate its causal relation with other ICs. We therefore propose this method as a promising data-driven tool for the detection of cognitive causal relationships in neuroimaging data.

Copyright information

© Marta Olivetti Belardinelli and Springer-Verlag 2005

Authors and Affiliations

  • Alessandro Londei
    • 1
    • 2
  • Alessandro D‘Ausilio
    • 1
    • 2
  • Demis Basso
    • 3
    • 4
  • Marta Olivetti Belardinelli
    • 1
    • 2
  1. 1.Department of Psychology 1University of Rome “La Sapienza”RomeItaly
  2. 2.ECONAInteruniversity Center for Research on Cognitive Processing in Natural and Artificial SystemsRomeItaly
  3. 3.Laboratory of Clinical Biochemistry and Molecular BiologyUniversity of PisaPisaItaly
  4. 4.Department of PsychologyUniversity of PaviaPisaItaly