TY  - JOUR
TI  - Neural and Behavioral Correlates of Extended Training during Sleep Deprivation in Humans: Evidence for Local, Task-Specific Effects
EP  - 4500
N2  - Recent work has demonstrated that behavioral manipulations targeting specific cortical areas during prolonged wakefulness lead to a region-specific homeostatic increase in theta activity (5?9 Hz), suggesting that theta waves could represent transient neuronal OFF periods (local sleep). In awake rats, the occurrence of an OFF period in a brain area relevant for behavior results in performance errors. Here we investigated the potential relationship between local sleep events and negative behavioral outcomes in humans.Volunteers participated in two prolonged wakefulness experiments (24 h), each including 12 h of practice with either a driving simulation (DS) game or a battery of tasks based on executive functions (EFs). Multiple high-density EEG recordings were obtained during each experiment, both in quiet rest conditions and during execution of two behavioral tests, a response inhibition test and a motor test, aimed at assessing changes in impulse control and visuomotor performance, respectively. In addition, fMRI examinations obtained at 12 h intervals were used to investigate changes in inter-regional connectivity.The EF experiment was associated with a reduced efficiency in impulse control, whereas DS led to a relative impairment in visuomotor control. A specific spatial and temporal correlation was observed between EEG theta waves occurring in task-related areas and deterioration of behavioral performance. The fMRI connectivity analysis indicated that performance impairment might partially depend on a breakdown in connectivity determined by a ?network overload.?Present results demonstrate the existence of an association between theta waves during wakefulness and performance errors and may contribute explaining behavioral impairments under conditions of sleep deprivation/restriction.
A1  - Bernardi, Giulio
A1  - Siclari, Francesca
A1  - Yu, Xiaoqian
A1  - Zennig, Corinna
A1  - Bellesi, Michele
A1  - Ricciardi, Emiliano
A1  - Cirelli, Chiara
A1  - Ghilardi, Maria Felice
A1  - Pietrini, Pietro
A1  - Tononi, Giulio
SN  - 0270-6474
VL  - 35
PB  - Society for Neuroscience
UR  - http://www.jneurosci.org/content/35/11/4487.abstract
IS  - 11
SP  - 4487
ID  - eprints2859
KW  - fMRI; hd-EEG; Impulse control; Local sleep; Performance; Theta waves
AV  - restricted
JF  - The Journal of Neuroscience
Y1  - 2015/03//
ER  -