Are there synapses on other neuron terminals in human brain like in Aplysia
A bunch of papers I was able to dig up after a cursory search on Google Scholar strongly indicates that heterosynaptic modulation does exist in man, at least in the motor cortex. In these papers the conclusion was reached by using indirect measures, namely by making use of specific stimulation strategies in intact brains in living humans. This as opposed to methods that more directly approach the question, like histology, or single-cell recordings.
References
- Hartwig et al., J Neurosci (2004); 24(13): 3379–85
- Jung &amp; Ziemann, J Neurosci (2009); 29(17): 5597–604
- Nitsche et al., J Neurosci (2007); 27(14): 3807–12
- Zhen et al, J Neurosci (2014); 34(21): 7314–21