TY - JOUR T1 - Two Streams of Attention-Dependent β Activity in the Striate Recipient Zone of Cat's Lateral Posterior–Pulvinar Complex JF - The Journal of Neuroscience JO - J. Neurosci. SP - 2230 LP - 2240 DO - 10.1523/JNEUROSCI.4004-06.2007 VL - 27 IS - 9 AU - Andrzej Wróbel AU - Anaida Ghazaryan AU - Marek Bekisz AU - Wojciech Bogdan AU - Jan Kamiński Y1 - 2007/02/28 UR - http://www.jneurosci.org/content/27/9/2230.abstract N2 - Local field potentials from different visual cortical areas and subdivisions of the cat's lateral posterior–pulvinar complex of the thalamus (LP-P) were recorded during a behavioral task based on delayed spatial discrimination of visual or auditory stimuli. During visual but not auditory attentive tasks, we observed an increase of β activity (12–25 Hz) as calculated from signals recorded from the caudal part of the lateral zone of the LP-P (LPl-c) as well as from cortical areas 17 and 18 and the complex located at the middle suprasylvian sulcus (MSS). This β activity appeared only in the trials that ended with a successful response, proving its relationship to the mechanism of visual attention. In contrast, no enhanced β activity was observed in the rostral part of the lateral zone of the LP-P and in the pulvinar proper. Two subregions of LPl-c (ventromedial and dorsolateral) were distinguished by visually related, attentional β activity of low (12–18 Hz) and high (18–25 Hz) frequencies, respectively. At the same time, area 17 exhibited attentional activation in the whole β range, and an increase of power in low-frequency β was observed in the medial bank of MSS, whereas cortical area 18 and the lateral bank of the MSS were activated in the high β range. Phase-correlation analysis revealed that two distinct corticothalamic systems were synchronized by the β activity of different frequencies. One comprised of cortical area 17, ventromedial region of LPl-c, and medial MSS, the second involved area 18 and the dorsolateral LPl-c. Our observations suggest that LPl-c belongs to the wide corticothalamic attentional system, which is functionally segregated by distinct streams of β activity. ER -