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Mental rotation of objects versus hands: neural mechanisms revealed by positron emission tomography.
The results suggest that at least two different mechanisms can be used in mental rotation, one mechanism that recruits processes that prepare motor movements and another mechanism that does not.
A symptom provocation study of posttraumatic stress disorder using positron emission tomography and script-driven imagery.
The results suggest that emotions associated with the PTSD symptomatic state are mediated by the limbic and paralimbic systems within the right hemisphere.
Regional cerebral blood flow in the amygdala and medial prefrontal cortex during traumatic imagery in male and female Vietnam veterans with PTSD.
A reciprocal relationship between medial prefrontal cortex and amygdala function in PTSD and opposing associations between activity in these regions and symptom severity consistent with current functional neuroanatomic models of this disorder are suggested.
Regional cerebral blood flow measured during symptom provocation in obsessive-compulsive disorder using oxygen 15-labeled carbon dioxide and positron emission tomography.
The data further implicate orbitofrontal cortex, caudate nucleus, and anterior cingulate cortex in the pathophysiology of OCD and in mediating OCD symptoms.
Regional cerebral blood flow during script-driven imagery in childhood sexual abuse-related PTSD: A PET investigation.
The recollection and imagery of traumatic events versus neutral events was accompanied by regional CBF increases in anterior paralimbic regions of the brain in trauma-exposed individuals with and without posttraumatic stress disorder.
Impaired recruitment of the hippocampus during conscious recollection in schizophrenia
Poor attention and impaired memory are enduring and core features of schizophrenia. These impairments have been attributed either to global cortical dysfunction or to perturbations of specific
Conscious recollection and the human hippocampal formation: evidence from positron emission tomography.
Comparisons showed that blood-flow increases in the hippocampal formation are specifically associated with the conscious recollection of studied words, whereas blood- flow increases in frontal regions are associated with efforts to retrieve target words.
Visual imagery and perception in posttraumatic stress disorder. A positron emission tomographic investigation.
Results suggest that ventral anterior cingulate gyrus and right amygdala play a role in the response of combat veterans with PTSD to mental images of combat-related scenes.
Visual Mental Imagery Activates Topographically Organized Visual Cortex: PET Investigations
Results were consistent with the existence of two types of imagery, one that rests on allocating attention to form a pattern and one that rested on activating stored visual memories, and evidence that imagery activates topographically mapped cortex.