Örüntü analizi için beyinde baǧlanirlik kestirimi

Translated title of the contribution: Estimating brain connectivity for pattern analysis

Itir Onal, Emre Aksan, Burak Velioglu, Orhan Firat, Mete Ozay, Like Oztekin, Fatos T.Yarman Vural

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this study, the degree of connectivity for each voxel, which is the unit element of functional Magnetic Resonance Imaging (fMRI) data, with its neighboring voxels is estimated. The neighborhood system is defined by spatial connectivity metrics and a local mesh of variable size is formed around each voxel using spatial neighborhood. Then, the mesh arc weights, called Mesh Arc Descriptors (MAD), are used to represent each voxel rather than its own intensity value measured by functional Magnetic Resonance Images (fMRI). Finally, the optimal mesh size of each voxel is estimated using various information theoretic criteria. fMRI measurements are obtained during a memory encoding and retrieval experiment performed on a subject who is exposed to the stimuli from 10 semantic categories. Using the Mesh Arc Descriptors (MAD) having the variable mesh sizes, a k-NN classifier is trained. The classification performances reflect that the suggested variable-size Mesh Arc Descriptors represent the cognitive states better than the classical multi-voxel pattern representation and fixed-size Mesh Arc Descriptors. Moreover, it is observed that the degree of connectivities in the brain greatly varies for each voxel.

Translated title of the contributionEstimating brain connectivity for pattern analysis
Original languageTurkish
Title of host publication2014 22nd Signal Processing and Communications Applications Conference, SIU 2014 - Proceedings
PublisherIEEE Computer Society
Number of pages4
ISBN (Print)9781479948741
Publication statusPublished - 2014 Jan 1
Event2014 22nd Signal Processing and Communications Applications Conference, SIU 2014 - Trabzon, Turkey
Duration: 2014 Apr 232014 Apr 25

Publication series

Name2014 22nd Signal Processing and Communications Applications Conference, SIU 2014 - Proceedings




  • degree of connectivity in brain
  • fMRI
  • mesh arc descriptors
  • optimal mesh size

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Control and Systems Engineering


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