text_1: Synaptic activity enhances local release of brain derived neurotrophic factor from postsynaptic dendrites.
text_2: In response to sLTP induction, we find fast (onset < 1 min) and sustained (>20 min) activation of TrkB in the stimulated spine that depends on NMDAR (N-methyl-d-aspartate receptor) and CaMKII signalling and on postsynaptically synthesized BDNF.