Dendritic coincidence detection of EPSPs and action potentials.
We describe a mechanism for coincidence detection mediated by the interaction between backpropagating action potentials and EPSPs in neocortical pyramidal neurons. At distal dendritic locations, appropriately timed EPSPs or oscillations could increase the amplitude of backpropagating action potentials by three- to fourfold. This amplification was greatest when action potentials occurred at the peak of EPSPs or dendritic oscillations and could lead to somatic burst firing. The increase in amplitude required sodium channel activation but not potassium channel inactivation. The temporal characteristics of this amplification are similar to those required for changes in synaptic strength, suggesting that this mechanism may be involved in the induction of synaptic plasticity.
Stuart
G J
GJ
Division of Neuroscience, John Curtin School of Medical Research, Australian National University, Canberra, Australia. greg.stuart@anu.edu.au
Häusser
M
M
D015761:4-Aminopyridine / Q000494:pharmacology; D000200:Action Potentials / Q000187:drug effects / Q000502:physiology*; D000818:Animals; D001683:Biological Clocks / Q000502:physiology; D003712:Dendrites / Q000502:physiology*; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology*; D066298:In Vitro Techniques; D008959:Models, Neurological; D009473:Neuronal Plasticity / Q000502:physiology; D026902:Potassium Channel Blockers; D015221:Potassium Channels / Q000378:metabolism; D017966:Pyramidal Cells / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D011930:Reaction Time / Q000502:physiology; D026941:Sodium Channel Blockers; D015222:Sodium Channels / Q000378:metabolism; D013003:Somatosensory Cortex / Q000166:cytology / Q000187:drug effects / Q000502:physiology; D013779:Tetrodotoxin / Q000494:pharmacology
D026902:Potassium Channel Blockers; D015221:Potassium Channels; D026941:Sodium Channel Blockers; D015222:Sodium Channels; D013779:Tetrodotoxin; D015761:4-Aminopyridine