Since different instants of the video will have a distinct amount of oscillations, this work applies a Gaussian filter adaptively in order to remove only the undesired camera motion.
A huge amount of significant oscillation results has been collected in several excellent monographs, see, e.g., [1, 2, 16, 21].
An apparent inverse dose-effect of pentobarbital on the amount of γ oscillations was observed (not shown).
In the striatum of sedated, narcotized or neuroleptanalgesied rats, ketamine and MK-801 increased the amount of γ oscillations (Fig. 7).
Also, ketamine and MK-801 dramatically increased the amount of γ oscillations in the prefrontal cortex with a pattern similar to that recorded in the frontoparietal cortex (Fig. 7).
Moreover, a previous study conducted in freely moving rats demonstrated that ketamine significantly increases the amount of high-frequency oscillations in the accumbens [29].
Systemic injection of ketamine or MK-801 dramatically increased the amount of background γ oscillations in many other regions, including the zona incerta (Fig. S3), the substantia innominata and lateral hypothalamus (not shown).
In addition, multisite recordings revealed that NMDAr antagonists dramatically enhance the amount of ongoing γ oscillations in multiple cortical and subcortical structures, including the prefrontal cortex, accumbens, amygdala, basalis, hippocampus, striatum and thalamus.
Under sedation, ketamine or MK-801 increased the amount of cortical γ oscillations, at least during the desynchronized states (Fig. 5A,B), and slightly increased by ∼5 Hz on average the frequency at maximal γ power (Table 3).
