keyword
https://read.qxmd.com/read/15711850/functional-mri-study-of-pasat-in-normal-subjects
#21
JOURNAL ARTICLE
B Audoin, D Ibarrola, M V Au Duong, J Pelletier, S Confort-Gouny, I Malikova, A Ali-Chérif, P J Cozzone, J-P Ranjeva
The paced auditory serial addition test (PASAT) is routinely used to evaluate the cognitive part of the multiple sclerosis functional composite (MSFC) score, the new reference index of patient disability. PASAT is sensitive to subtle cognitive impairment related to MS, although the cognitive components of this test still remain unclear. In order to better characterize brain systems involved during this complex task, functional magnetic resonance imaging (fMRI) experiments were conducted during PASAT in a population of ten normal subjects...
May 2005: Magma
https://read.qxmd.com/read/15169688/event-related-fmri-of-frontotemporal-activity-during-word-encoding-and-recognition-in-schizophrenia
#22
COMPARATIVE STUDY
J Daniel Ragland, Ruben C Gur, Jeffrey Valdez, Bruce I Turetsky, Mark Elliott, Christian Kohler, Steve Siegel, Stephen Kanes, Raquel E Gur
OBJECTIVE: Neuropsychological studies have demonstrated verbal episodic memory deficits in schizophrenia during word encoding and retrieval. This study examined neural substrates of memory in an analysis that controlled for successful retrieval. METHOD: Event-related blood-oxygen-level-dependent (BOLD) functional magnetic resonance imaging (fMRI) was used to measure brain activation during word encoding and recognition in 14 patients with schizophrenia and 15 healthy comparison subjects...
June 2004: American Journal of Psychiatry
https://read.qxmd.com/read/15050572/item-and-task-level-processes-in-the-left-inferior-prefrontal-cortex-positive-and-negative-correlates-of-encoding
#23
JOURNAL ARTICLE
Jeremy R Reynolds, David I Donaldson, Anthony D Wagner, Todd S Braver
Activity in the left inferior prefrontal cortex (LIPC) is often thought to reflect processes that support episodic encoding. Functional magnetic resonance imaging (fMRI) was used to test whether processes subserved by LIPC could be negatively related to subsequent memory performance. Specifically, the current experiment explicitly tested the hypothesis that LIPC processing would positively impact encoding when primarily focused towards specific target items (item-level processing), whereas it would negatively impact encoding when primarily focused on the retrieval and instantiation of current task instructions (task-level processing)...
April 2004: NeuroImage
https://read.qxmd.com/read/12911455/usefulness-of-language-and-memory-testing-during-intracarotid-amobarbital-testing-observations-from-an-fmri-study
#24
JOURNAL ARTICLE
A P Aldenkamp, P A Boon, K Deblaere, E Achten, W H Backes, P Boon, P Hofman, J Troost, P Vandemaele, J Vermeulen, K Vonck, J Wilmink
BACKGROUND: Several procedures for testing language lateralization and memory function exist during the intracarotid amobarbital test (IAT). The use of functional magnetic resonance imaging (fMRI) gives the opportunity to assess the validity of some of these procedures, or at least to inspect the neuronal correlates. A comprehensive fMRI protocol was tested, aimed at addressing aspects of lateralization of language, as well as testing memory in relation to activation of mesiotemporal regions...
September 2003: Acta Neurologica Scandinavica
https://read.qxmd.com/read/10769304/imaging-cognition-ii-an-empirical-review-of-275-pet-and-fmri-studies
#25
REVIEW
R Cabeza, L Nyberg
Positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) have been extensively used to explore the functional neuroanatomy of cognitive functions. Here we review 275 PET and fMRI studies of attention (sustained, selective, Stroop, orientation, divided), perception (object, face, space/motion, smell), imagery (object, space/motion), language (written/spoken word recognition, spoken/no spoken response), working memory (verbal/numeric, object, spatial, problem solving), semantic memory retrieval (categorization, generation), episodic memory encoding (verbal, object, spatial), episodic memory retrieval (verbal, nonverbal, success, effort, mode, context), priming (perceptual, conceptual), and procedural memory (conditioning, motor, and nonmotor skill learning)...
January 2000: Journal of Cognitive Neuroscience
https://read.qxmd.com/read/9417969/late-onset-of-anterior-prefrontal-activity-during-true-and-false-recognition-an-event-related-fmri-study
#26
JOURNAL ARTICLE
D L Schacter, R L Buckner, W Koutstaal, A M Dale, B R Rosen
Previous studies using PET and fMRI to examine memory retrieval have been limited by the requirement to test different types of items in separate blocks and to average data across items and response types within blocks. We used recently developed procedures for analyzing event-related mixed trial data from fMRI experiments to compare brain activity during true recognition of previously studied words and false recognition of semantic associates. A previous PET study using blocked testing procedures reported similarities and differences in rCBF patterns associated with true and false recognition (Schacter et al...
November 1997: NeuroImage
https://read.qxmd.com/read/8780076/determination-of-language-dominance-using-functional-mri-a-comparison-with-the-wada-test
#27
COMPARATIVE STUDY
J R Binder, S J Swanson, T A Hammeke, G L Morris, W M Mueller, M Fischer, S Benbadis, J A Frost, S M Rao, V M Haughton
We performed functional MRI (FMRI) in 22 consecutive epilepsy patients undergoing intracarotid amobarbital (Wada) testing and compared language lateralization measures obtained with the two procedures. FMRI used a single-word semantic decision task previously shown to activate lateralized language areas in normal adults. Correlation between the two tests was highly significant (r = 0.96; 95% CIs 0.90 to 0.98; p < 0.0001). These results validate the FMRI technique and suggest that "active" areas observed with this semantic processing task correspond to those underlying hemispheric dominance for language...
April 1996: Neurology
https://read.qxmd.com/read/7577328/exploring-memory-functions-by-means-of-brain-electrical-topography-a-review
#28
REVIEW
F Rösler, M Heil, E Hennighausen
A series of experiments is reviewed which explored whether the functional brain state of long-term memory retrieval is correlated with specific changes in slow, DC-like event-related brain potentials. The main results are: (1) Retrieving associations from long-term memory is accompanied by a slow negative shift of 5-10 microV which prevails about as long as the retrieval process lasts, i.e., in our experiments, for a period of several seconds: (2) When different types of representations have to be reactivated in memory the slow negative wave shows a clearly distinct topography...
1995: Brain Topography
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