The version of Figure 3 originally published in this article was not the one intended for publication, and therefore does not correspond to the accompanying legend. The correct version of Figure 3 is published below. Additionally, the authors would like to clarify the legend that accompanies Figure 3. The original final sentence is ambiguous, and should be replaced by " Jacob is only present in...

What happens to a single, presynaptically quiescent synapse among a population of active synapses? In this issue of Neuron, Ehlers and colleagues show that, far from being eliminated, these inactive synapses are primed for potentiation and incorporation into a new neural circuit through an upregulation of NR2B-containing NMDA receptors.

iii ACKNOWLEDGMENTS First, I would like to offer thanks to Dr. Mark Stanton for his mentorship over the last 2.5 years. His support and guidance over the course of my undergraduate career has contributed significantly to my development as a researcher and scholar. I am very grateful to the extraordinary group of graduate and undergraduate students of their training in experimental procedures, a...

A selective N-methyl-D-aspartate antagonist, DL-2-amino-5-phosphonovalerate, was found to produce PCP-like catalepsy, discriminative stimulus effects, and stereotyped operant responding in pigeons when administered intramuscularly. These results support the hypothesis that the behavioral effects of PCP-like drugs result at least in part from reduced neurotransmission at excitatory amino acid sy...