In Aplysia long-term facilitation (sensitization): CREB 1 increases and CREB 2 decreases transcription CREB1 and 2 both increase gene transcription CREB 1 and 2 both inhibit gene transcription Question 14 1 pts Hippocampal (early) LTP involves adding more of which receptors to the synaptic membrane? AMPA NMDA serotonin.