Abstract：
:Olfaction is a principal sensory modality in rodents, and rats quickly learn to discriminate between odors and to associate odor with reward. Here we show that such olfactory discrimination (OD) learning consists of two phases with distinct cellular mechanisms: an initial NMDAR-sensitive phase in which the animals acquire a successful behavioral strategy (rule learning), followed by an NMDAR-insensitive phase in which the animals learn to distinguish between individual odors (pair learning). Rule learning regulates the composition of synaptic NMDARs in the piriform cortex, resulting in receptors with a higher complement of the NR2a subunit protein relative to NR2b. Rule learning also reduces long-term potentiation (LTP) induced by high-frequency stimulation of the intracortical axons in slices of piriform cortex. As NR2a-containing NMDARs mediate shorter excitatory postsynaptic currents than those containing NR2b, we suggest that learning-induced regulation of NMDAR composition constrains subsequent synaptic plasticity, thereby maintaining the memory encoded by experience.
journal_name
Neuronjournal_title
Neuronauthors
Quinlan EM,Lebel D,Brosh I,Barkai Edoi
10.1016/s0896-6273(03)00874-2subject
Has Abstractpub_date
2004-01-22 00:00:00pages
185-92issue
2eissn
0896-6273issn
1097-4199pii
S0896627303008742journal_volume
41pub_type
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