6.You are interested in how the density of NMDA receptors in the postsynaptic membrane prior to stimulation will affect future LTP and LTD production. You prepare mouse hippocampal slices with three types of postsynaptic neurons - neurons that have either very high densities, very low densities, or zero density of NMDA receptors. You stimulate the neurons presynaptic to these different types of postsynaptic neurons using a brief, high-frequency stimulation protocol (100 Hz) or a prolonged, low-frequency stimulation protocol (10 Hz). You then record whether an LTP or LTD was produced. Match the different NMDA receptor densities in the first column with the expected LTP/LTD occurrences in the second column of the table below: 6A. For each pairing in your answer above, explain why a particular NMDA receptor density led to the result you chose rather than another one of the listed possibilities.