Assessment of network states: local hemodynamics.

Abstract:

:Neural activity utilizes energy resources and requires replenishment of metabolites through vascular dilation. During wake, cortical neurons usually have depolarized membrane potentials and exhibit frequent spontaneous action potentials, requiring an increased metabolic delivery to activated tissue and causing blood vessels to dilate. Quiet sleep (QS) is characterized by alternating membrane potential between a depolarized and hyperpolarized state. The hyperpolarized state has a lower membrane potential and exhibits few action potentials, which may be less metabolically demanding. In order to investigate the relationship between evoked neural and metabolic responses across wake and sleep states, we combined electrical and optical imaging techniques. We implanted rats with screw electrodes to measure evoked response potentials (ERPs), and used a light emitting diode (LED) and photodiode to measure evoked changes in local hemodynamics based on hemoglobin absorption properties. During QS, hemodynamic changes were larger in amplitude compared to wake and rapid eye movement (REM) sleep. In this review, we explore the potential mechanisms for the larger hemodynamic changes. Wake periods may correspond to decreased vessel compliance as they expand to supply tissue with metabolites while sleep periods may decrease metabolic demand and allow vessels to relax and restore compliance.

journal_name

Curr Top Med Chem

authors

Schei JL,Rector DM

doi

10.2174/156802611797470349

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

2447-51

issue

19

eissn

1568-0266

issn

1873-4294

pii

BSP/CTMC/E-Pub/-000188-11-21

journal_volume

11

pub_type

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