Big brain, small world?

نویسندگان

  • Erik Olofsen
  • Albert Dahan
چکیده

8 January 2015 T HE electroencephalogram is the scalp recording of the electrical activity of the brain and reflects the activity of millions of neurons on and just below the surface of the brain. The electroencephalogram is used extensively as surrogate marker of anesthetic effect. The rhythmic pattern of the electroencephalogram is complex and while some patterns are easily recognized by the eye, such as sleep spindles during stage 2 sleep, sophisticated analyses techniques have been developed to disentangle the complexities of electroencephalographic behavior. In this issue of AnEstHEsIology, Khodayari-Rostamabad et al.1 present data on the effect of the opioid remifentanil on the electroencephalogram. They first performed a functional connectivity analysis to establish the characteristics of the cortical network and subsequently analyzed the network with a technique based on graph theory. Functional connectivity represents statistical covariation between brain regions (i.e., brain regions with similar rhythmic activity), however, without any implications regarding causality or mechanism. to construct the network, Khodayari-Rostamabad et al.1 calculated the coherence matrix of the electroencephalogram in the standard bands, assuming that the electrodes serve as nodes to the network. Apart from the electroencephalogram, other techniques, such as functional magnetic imaging, may be used to define functional brain connectivity.2

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عنوان ژورنال:
  • Anesthesiology

دوره 122 1  شماره 

صفحات  -

تاریخ انتشار 2015