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Titolo:
Relationship of spikes, synaptic activity, and local changes of cerebral blood flow
Autore:
Lauritzen, M;
Indirizzi:
Glostrup Cty Hosp, Dept Clin Neurophysiol, DK-2600 Glostrup, Denmark Glostrup Cty Hosp Glostrup Denmark DK-2600 ol, DK-2600 Glostrup, Denmark Univ Copenhagen, DK-2600 Glostrup, Denmark Univ Copenhagen Glostrup Denmark DK-2600 agen, DK-2600 Glostrup, Denmark
Titolo Testata:
JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM
fascicolo: 12, volume: 21, anno: 2001,
pagine: 1367 - 1383
SICI:
0271-678X(200112)21:12<1367:ROSSAA>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAT CEREBELLAR CORTEX; LASER-DOPPLER FLOWMETRY; POSITRON EMISSION TOMOGRAPHY; ACTIVITY-DEPENDENT INCREASES; BRAIN GLUCOSE-METABOLISM; PRIMARY VISUAL-CORTEX; NITRIC-OXIDE; ELECTRICAL-STIMULATION; WHISKER STIMULATION; NEURONAL-ACTIVITY;
Keywords:
action potentials; animal; electrophysiology; field potentials; hemodynamics; synaptic transmission;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
130
Recensione:
Indirizzi per estratti:
Indirizzo: Lauritzen, M Glostrup Cty Hosp, Dept Clin Neurophysiol, DK-2600 Glostrup, Denmark Glostrup Cty Hosp Glostrup Denmark DK-2600 lostrup, Denmark
Citazione:
M. Lauritzen, "Relationship of spikes, synaptic activity, and local changes of cerebral blood flow", J CEREBR B, 21(12), 2001, pp. 1367-1383

Abstract

The coupling of electrical activity in the brain to changes in cerebral blood flow (CBF) is of interest because hemodynamic changes are used to trackbrain function. Recent studies, especially those investigating the cerebellar cortex, have shown that the spike rate in the principal target cell of a brain region (i.e. the efferent cell) does not affect vascular response amplitude. Subthreshold integrative synaptic processes trigger changes in the local microcirculation and local,glucose consumption. The spatial specificity of the vascular response on the brain surface is limited because of the functional anatomy of the pial vessels. Within the cortex there is a characteristic laminar flow distribution, the largest changes of which are observed at the depth of maximal synaptic activity (i.e. layer IV) for an afferent input system. Under most conditions, increases in CBF are explained by activity in postsynaptic neurons, but presynaptic elements can contribute. Neurotransmitters do not mediate increases in CBF that are triggered by theconcerted action of several second messenger molecules. It is important todistinguish between effective synaptic inhibition and deactivation that increase and decrease CBF and glucose consumption, respectively. In summary, hemodynamic changes evoked by neuronal activity depend on the afferent input function (i.e. all aspects of presynaptic and postsynaptic processing), but are totally independent of the efferent function (i.e., the spike rate of the same region). Thus, it is not possible to conclude whether the outputlevel of activity of a region is increased based on brain maps that use. blood-flow changes as markers.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 00:22:51