Fig. 6.
Electrical stimulation of tectothalamic inputs to the MGBv (A–D) and MGBd (E–G) pathways. (A and E) Photostimulation guided the placement of the stimulating electrode. (B and F) Intrinsic properties of recorded MGB neurons. Most MGBv neurons exhibited a pronounced hyperpolarization-activated (Ih) current. The tectothalamic pathway to MGBd depressed in response to paired pulses (C) and showed no mGlu receptor component (D), whereas the pathway to MGBd facilitates (G) and has a group 1 mGlu receptor response (H).