The mechanism of hearing and memory, include all, EXCEPT:
Changes in level of neurotransmitter at synapse
Increasing protein synthesis
Recruitment by multiplication of neurons
Spatial Reorganization of synapse
Neurons are 'permanent cells' that do not undergo mitotic division in post natal life. The production of neurons stop sholy after bih. Ref: Neurons and Networks: An Introduction to Behavioral Neuroscience By John E. Dowling; Ganong's Review of Medical Physiology, 22nd Edition, Page 259, 270; Robbins Pathologic Basis of Disease, 7th Edition, Page 91