Charalambos Papageorgiou

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OBJECTIVE Time perception deficiency has been implicated in schizophrenia; however the exact nature of this remains unclear. The present study was designed with the aim to delineate timing deficits in schizophrenia by examining performance of patients with schizophrenia and healthy volunteers in an interval discrimination test and their accuracy and(More)
The present study introduces the concept of spectral power coherence (SPC), which reflects the pattern of coordination of the four basic EEG bands (delta, theta, alpha, and beta) at a specific location of the brain. The SPC was calculated for the pre-stimulus EEG signal during an auditory memory task under different electromagnetic field (EMF) conditions(More)
BACKGROUND Executive function deficits in depression implicate involvement of frontal-striatal circuits. However, studies of hypothalamic-pituitary-axis (HPA) function suggest that stress-related brain changes of hippocampus may also implicate prefrontal-hippocampal circuits, which may explain the profile of both executive dysfunction and memory deficits.(More)
The mismatch negativity (MMN) component of the auditory event-related potential is associated with automatic perceptual inference concerning changes in auditory stimulation. Recent studies have addressed the question whether performance and MMN is affected by the direction of frequency deviance. In the present study, the frequency MMN and performance is(More)
OBJECTIVE Clinical practice and research provide evidence indicating the involvement of psychological factors in essential hypertension. Little is known about interoception (i.e. the ability of perceiving bodily signals) in essential hypertension. The present study focused on the assessment of interoceptive awareness in newly diagnosed-untreated(More)
OBJECTIVE Kallmann's Syndrome is a heritable disorder characterized by the association of hypogonadotropic hypogonadism and anosmia or hyposmia. A common pathogenesis for KS and schizophrenia had been proposed based on shared pathologies of these two disorders, although no such clinical associations have ever been reported. METHOD We report a 35 year old(More)
Background: Recently it has been shown that the second-pass parsing process of information processing, as indexed by the P600 component of event-related potentials (ERPs), elicited during a working memory (WM) test, is impaired in first episode schizophrenic (FES) patients. Objective: The purpose of this study is to develop a decision support system – based(More)
BACKGROUND Recent research recognizes the association between handedness, linguistic processes and cerebral networks subserving executive functioning, but the nature of this association remains unclear. Since the P50 event related potential (ERP) is considered to reflect thalamocortical processes in association with working memory (WM) operation the present(More)
OBJECTIVE The P600 component of event-related potentials (ERPs) reflecting the 'rule-governed sequence of information processing', has been associated with multiple sclerosis (MS)-related cognition. The present study aimed at examining the effects of methylprednisolone treatment in MS patients on cognition as reflected by the low-resolution brain(More)