Methylphenidate (MPD), a psychostimulant, is the first line drug for improving cognitive performance in attention deficit hyperactivity disorder (ADHD). A non-prescription use of this also becoming increasingly known. growing rise its medical and nonmedical suggests that addictive.The present study was designed to ascertain reinforcing withdrawal effects clinically relevant doses methylphenidat...

Background: Literature suggests that the prevalence of depression among female college students is more than male students. Repeated sexual objectification females appears to be one factor can used explain this disparity and higher in attributed repeated experiences by them. This study examines association between at a medical Rajasthan, India. Methods: A cross-sectional observational was condu...

METHODS. Ten normally sighted subjects and five patients with macular degeneration were asked to perform two visually guided saccade tasks and two word-recognition tasks during fMRI with behavioral monitoring. The fMRI measurements were repeated three times at intervals of at least 4 weeks between sessions. The intrasubject reproducibility of the brain activation patterns was examined in a mode...

Behavioral syntactic priming effects during sentence comprehension are typically observed only if both the syntactic structure and lexical head are repeated. In contrast, during production syntactic priming occurs with structure repetition alone, but the effect is boosted by repetition of the lexical head. We used fMRI to investigate the neuronal correlates of syntactic priming and lexical boos...

Repeated exposure to a stimulus facilitates its processing. This is reflected in faster and more accurate identification, reduced perceptual identification thresholds, and more efficient classifications for repeated compared with novel items. Here, we test a hypothesis that this experience-based behavioral facilitation is a result of enhanced communication between distinct cortical regions, whi...

To investigate CNS habituation (i.e. response decrement due to stimulus repetition) the present study used positron emission tomography (PET) to measure regional cerebral blood flow (rCBF) in eight healthy women during two repetitions of complex visual stimuli. Repeated visual stimulation resulted in neural habituation bilaterally in the secondary visual cortex and in the right medial temporal ...