Natalia Ojeda

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The self-medication hypothesis attempts to explain the extraordinary high levels of cigarette smoking in schizophrenia; patients may smoke in an attempt to reduce their cognitive deficits, symptoms, or the side effects of antipsychotics. In a previous report, we detected beneficial performance in attention and working memory in patients with first-episode(More)
We examined changes in relative cerebral flood flow (relCBF) using PET during a sustained attention paradigm which included auditory stimulation and different tasks of mental counting. Ten normal volunteers underwent PET (15O water) during a baseline state and under experimental conditions which included listening to clicks, serial counting with auditory(More)
BACKGROUND The main objective was to identify variables that predict functional disability in chronic schizophrenia over time. METHOD We examined 95 hospitalized patients with schizophrenia (DSM-IV criteria) in a long-stage unit and 53 healthy controls (matched for age, gender, and years of education). Neuropsychological battery included tests for verbal(More)
Cognitive remediation improves cognition in patients with schizophrenia, but its effect on other relevant factors such as negative symptoms and functional outcome has not been extensively studied. In this hospital-based study, 84 inpatients with chronic schizophrenia were recruited from Alava Hospital (Spain). All of the subjects underwent a baseline and a(More)
OBJECTIVES To examine the efficacy of an integrative cognitive training program (REHACOP) to improve cognition, clinical symptoms, and functional disability of patients with Parkinson disease (PD). METHODS Forty-two patients diagnosed with PD in Hoehn & Yahr stages 1 to 3 were randomly assigned to either the cognitive training group (REHACOP) or the(More)
OBJECTIVE We sought to determine whether a single hypothesized latent factor structure would characterize cognitive functioning in three distinct groups. METHODS We assessed 576 adults (340 community controls, 126 adults with bipolar disorder, and 110 adults with schizophrenia) using 15 measures derived from nine cognitive tests. Confirmatory factor(More)
OBJECTIVE To assess whether functional neural connectivity is disrupted between the regions of the default mode network (DMN) in Parkinson's disease (PD) and how this connectivity is related to cognition, brain gray matter structure and white matter integrity and diffusivity. METHODS Thirty-seven PD patients and 16 healthy controls were evaluated, using(More)
Results of this PET-O15 water activation study confirm the implication of supplementary motor areas during time estimation tasks. They also show that the cortical-subcortical network associated with temporal processing is impaired in schizophrenia. Following recent proposals of time dynamic networks, this impairment may consist in a dysfunctional imbalance(More)
Deficits in sustained attention have been frequently described in schizophrenia. The neuroanatomical basis reported previously have included altered levels of activation in cingulate and prefrontal cortex, but the contribution of further regions remains unclear. We explored the full neuroanatomy underlying the sustained attentional deficits observed in(More)
OBJECTIVE Decreased processing speed (PS) is a key feature of schizophrenia with respect to cognition, functional outcome and clinical symptoms. Our objective was to test whether PS slowing mediates other neuropsychological deficits among patients with chronic schizophrenia. METHOD One hundred patients with schizophrenia and 53 healthy adults completed a(More)