Gamma response of the brain: a multifunctional oscillation that represents bottom-up with top-down processing

Macroscopic fast neuronal oscillations and synchrony in schizophrenia

“…Initially, the precise functional significance of ␥ band abnormalities in schizophrenia is unclear, because ␥ band synchronization is associated with multiple rather than a single unitary information-processing function (14). Incidentally, the theoretical and operational definition of the primary function of ␥ band synchronization (binding) typically bears a strong resemblance to the concept of selective attention, which often has been used to explain schizophrenia symptomatology.…”

Event-Related Oscillations in Offspring of Alcoholics: Neurocognitive Disinhibition as a Risk for Alcoholism

“…Further, oscillatory gamma responses have been shown to be involved in visual perception, cognitive integrative function such as 'binding', and frontal input during sensory processing (top-down processing) (e.g. Basar-Eroglu et al 1996a, 1996bSchurmann et al 1997;Basar et al 2001aBasar et al , 2001bKarakas et al 2001). It is suggested that higher frequency oscillations are involved in more localized neural networks, whereas the long range communication networks (e.g., posterior to anterior sites) are activated through slow oscillations (von Stein and Sarnthein 2000;Kopell et al 2000;Steriade 2001;Csicsvari et al 2003;Buzsaki and Draguhn 2004).…”

Suppression of early evoked gamma band response in male alcoholics during a visual oddball task

“…It has been observed at early (0 -150 ms) and later (200 -300 ms) (Herrmann et al, 1999). The functional significance of the early evoked gamma activity has been attributed to sensory processing (Karakas and Basar, 1998;Sannita et al, 1999) and is considered to be influenced by bottom-up as well as top-down information processing (Karakas et al, 2001(Karakas et al, , 2003. However, some researchers have associated this gamma activity to early stimulus selection and attentional processing (Tiitinen et al, 1993(Tiitinen et al, , 1997Debener et al, 2003;Fell et al, 2003).…”