Single-unit, event-related potential (ERP), and neuroimaging studies have implicated the prefrontal cortex (PFC) in top-down control of attention and working memory. We conducted an experiment in patients with unilateral PFC damage (n = 8) to assess the temporal kinetics of PFC-extrastriate interactions during visual attention. Subjects alternated attention between the left and the right hemifi...

A novel, two-inductor, interleaved PFC boost converter that exhibits voltage-doubler characteristic when it operates with a duty cycle greater than 0.5 is introduced. The voltage-doubler characteristic of the proposed converter makes it quite suitable for universal-line (90-264 VRMS) PFC applications. Because the proposed PFC boost rectifier operates as a voltage doubler at low line, its low-li...

Attempts were made to elucidate the cause of the downward regulation of the splenic plaque-forming cell (PFC) response in AKR/J and BALB/c mice between days 4 and 7 after a single intravenous injection of 2,4,6,trinitrophenyl- lys-Ficoll(TNP-F). AKR/J spleen cells, taken 7 d after injection of TNP-F, were transferred, together with TNP-F, into normal AKR/J mice. The day-3 or - 4 PFC response of...

Glucocorticoid hormones are important in the maintenance of many brain functions. Although their receptors are distributed abundantly throughout the brain, including the prefrontal cortex (PFC), it is not clear how glucocorticoid functions, particularly with regard to cognitive processing in the PFC. There is evidence of PFC cognitive deficits such as working memory impairment in several stress...

CONTEXT Autism often involves early brain overgrowth, including the prefrontal cortex (PFC). Although prefrontal abnormality has been theorized to underlie some autistic symptoms, the cellular defects that cause abnormal overgrowth remain unknown. OBJECTIVE To investigate whether early brain overgrowth in children with autism involves excess neuron numbers in the PFC. DESIGN, SETTING, AND CAS...

Portable functional near-infrared spectroscopy (fNIRS) systems have the potential to image brain in naturalistic settings. Experimental studies are essential validate such fNIRS systems. Working memory (WM) is a short-term active that associated with temporary storage and manipulation of information. The prefrontal cortex (PFC) area involved processing WM. We assessed PFC during n-back WM tasks...

Abstract Predictive functional control (PFC) is the simplest model-based algorithm, equipped with attributes of a fully fledged predictive controller but at cost and complexity threshold standard PID regulator. It has proven benefits in controlling stable SISO dynamic systems, similarly to its competitor PID, it loses efficacy when challenging application introduced. In this paper, we present m...

Power factor correction (PFC) techniques play an important role in green power and energy-saving technology. Based on conventional boost PFC, many novel topologies and control strategies of bridgeless PFC(BPFC) have been proposed, and BPFC reduces the number of devices, the losses and improves the power density as well. In this paper, it discusses and investigates a variety of low conduction lo...