Functional frontoparietal connectivity during short-term memory as revealed by high-resolution EEG coherence analysis.
In this electroencephalographic study, the authors modeled the functional connectivity between frontal and parietal areas during short-term memory (STM) processes by spectral coherence analysis and the directed transfer function, that is, for the estimation of coherence "direction." A no-STM task was used as a reference. STM was characterized by an increased frontoparietal electroencephalograph coherence at high frequencies (beta and gamma, 14-45 Hz). In the control task, parietal-to-frontal flow prevailed at those frequencies. However, the STM task showed a bidirectional frontoparietal flow at the gamma band. In conclusion, frontoparietal connectivity would optimize "representational" memory during STM. In this context, the frontal areas would increase their influence on parietal areas for memory retention.
Dipartimento di Fisiologia Umana e Farmacologia, Università degli Studi di Roma "La Sapienza', Rome, Italy. claudio.babiloni@uniroma1.it
Claudio
C
Babiloni
Fabio
F
Babiloni
Filippo
F
Carducci
Febo
F
Cincotti
Fabrizio
F
Vecchio
Benedetta
B
Cola
Simone
S
Rossi
Carlo
C
Miniussi
Paolo Maria
PM
Rossini
D000328:Adult; D004566:Electrodes; D004569:Electroencephalography / Q000379:methods*; D005071:Evoked Potentials / Q000502:physiology; D005625:Frontal Lobe / Q000502:physiology*; D006801:Humans; D008570:Memory, Short-Term / Q000502:physiology*; D016571:Neural Networks, Computer; D009434:Neural Pathways / Q000502:physiology*; D010296:Parietal Lobe / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D012815:Signal Processing, Computer-Assisted