the LGN show robust oscillatory activity at around 50 Hz (Ghose and Freeman 1992). Later work also revealed the presence of fast oscillations in the LGN, not only under anaesthesia but also during natural wakefulness (Steriade et al. 1996). Crucially, this latter study also demonstrated that such oscillations are present in a variety of different thalamic nuclei, occur in tight synchrony with rhythmic activity in related cortical areas, and are highly correlated with oscillatory phenomena in individual TC neurons (Steriade et al. 1996; see also Steriade et al. 1991). This suggested that the thalamus may play a more active role in the generation of fast oscillations than had been previously thought.
