Fig. 4.

Heterosynaptic long term potentiation (LTP) of auditory stimuli by the MGm. Stimulation of the MGm (200 Hz, 50 ms) paired with a preceding click produces LTP of click evoked local field potentials (LFPs) in the primary auditory cortex. Group mean (± SE) before and for 2 h after 30 click–stimulation pairings (n = 9). Probe clicks were given at 0.2 Hz before and for 60 min after pairing, and less often thereafter. Note the large magnitude of potentiation (ordinate Z-scores above pre-stimulation). Controls exhibited no facilitation. (Weinberger et al., 1995)