<prompt> The mechanism of hearing and memory, include all exceptChanges in level of neurotransmitter at synapseIncreasing protein synthesisRecruitment by multiplication of neuronsSpatial Reorganization of synapse  <response>: The various changes occurring are Increase in vesicle release sites for the secretion of transmitter substance, increase in number of transmitter vesicles released, increase in number of presynaptic terminals and changes in structures of the dendritic spines that permit transmission of stronger signals. REF: TEXTBOOK OF MEDICAL PHYSIOLOGY GUYTON AND HALL, 12e Page no 838 