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samenvatting Neurofysiologie - Concepten rond synaptische schakelingen
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CONCEPTEN ROND SYNAPTISCHESCHAKELINGEN EN SYNAPTISCHE
PLASTICITEIT
CONCEPTEN ROND SYNAPTISCHE SCHAKELINGEN
CONVERGENTIE-DIVERGENTIE
Divergentie: 1 signaal leidt tot meerdere signalen die naar hersenen doorgestuurd worden
• Kan leiden tot amplificatie
Vb: sensorieel
Convergentie: meerdere inkomende signalen worden geïntegreerd tot 1
signaal en doorgestuurd
Vb: motorisch
FEED FORWARD – FEEDBACK (TERUGKOPPELING)
Feed-forward inhibitie:
, Feedback inhibitie:
NEGATIEVE EN POSITIEVE TERUGKOPPELING
Negatieve terugkoppeling maakt signaal stabieler
• Gevaar voor oscillaties als
o Vertraging in FB-lus
o Te veel versterking in feed-forward pad
Positieve terugkoppeling geeft amplificatie
• Signaal wordt versterkt naargelang wat nodig aan uitgang
• Gevaar saturatie als wa aan max uitput zitten
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