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BACKGROUND Gamma band activity has been associated with many sensory and cognitive functions, and is important for cortico-cortical transmission and the integration of information across neural networks. The aims of the present study were to determine if schizophrenia patients have deficits in the generation and maintenance of coherent, synchronized(More)
BACKGROUND Schizophrenia patients exhibit widespread deficits in many domains, ranging from abnormalities in preattentional sensory processing to gross impairments in everyday functioning. Mismatch negativity (MMN) is an event-related potential measure that occurs in the absence of directed attention. While many studies have reported MMN deficits in(More)
OBJECTIVE Because previous studies have demonstrated that patients with chronic schizophrenia have deficits in mismatch negativity associated with poor everyday functioning, the authors investigated the longitudinal stability of mismatch negativity deficits and their longitudinal relationship to poor functional status. METHOD Ten patients with chronic(More)
Schizophrenia patients have prominent deficits in information processing that can be detected by measures of prepulse inhibition (PPI) of the startle response. Deficient PPI in schizophrenia is thought to reflect a failure of brain-based information 'protective' mechanisms that normally inhibit responsivity for 30-500ms after a weak prepulse stimulus. The(More)
BACKGROUND Attentional dysfunction is related to functional disability in patients with neuropsychiatric disorders such as schizophrenia, bipolar disorder, and Alzheimer's disease. Indeed, sustained attention/vigilance is among the leading targets for new medications designed to improve cognition in schizophrenia. Although vigilance is assessed frequently(More)
BACKGROUND AND RATIONALE Pharmacotherapy of schizophrenia has traditionally targeted positive psychotic symptoms. An emerging view is that developing medications that improve cognition in schizophrenia patients is a major step forward in achieving better functional outcome. The cognitive deficits that are often observed in schizophrenia can be assessed(More)
OBJECTIVE Schizophrenia (SZ) patients have information processing deficits, spanning from low level sensory processing to higher-order cognitive functions. Mismatch negativity (MMN) and P3a are event-related potential (ERP) components that are automatically elicited in response to unattended changes in ongoing, repetitive stimuli that provide a window into(More)
Brain oscillations are increasingly used for understanding complex psychiatric disorders. Gamma (30-50Hz) oscillations have warranted special attention due to their omnipresence in cognitive tasks. For patients with schizophrenia (SCZ), a disease associated with poor cognition, abnormal gamma oscillations have been reported in many experimental paradigms.(More)
INTRODUCTION Under specific conditions, a weak lead stimulus, or "prepulse", can inhibit the startling effects of a subsequent intense abrupt stimulus. This startle-inhibiting effect of the prepulse, termed "prepulse inhibition" (PPI), is widely used in translational models to understand the biology of brainbased inhibitory mechanisms and their deficiency(More)
CONTEXT Patients with schizophrenia exhibit deficits in automatic, preattentive sensorimotor gating (prepulse inhibition [PPI]) of the startle reflex. OBJECTIVE To assess the relationships between PPI deficits and demographic, clinical, neurocognitive, and functional status in a large cohort of patients with schizophrenia. DESIGN Cross-sectional(More)