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Michael D. Rugg
University of Texas at Dallas
310Publications
92H-index
29.1kCitations
Publications 310
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#1Louis Renoult (UEA: University of East Anglia)H-Index: 10
#2Muireann Irish (USYD: University of Sydney)H-Index: 29
Last.Michael D. Rugg (UEA: University of East Anglia)H-Index: 92
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The distinction between episodic and semantic memory was first proposed in 1972 by Endel Tulving and is still of central importance in cognitive neuroscience. However, data obtained over the past 30 years or so support the idea that the frontiers between perception and knowledge and between episodic and semantic memory are not as clear cut as previously thought, prompting a rethink of the episodic–semantic distinction. Here, we review recent research on episodic and semantic memory, highlighting...
#1Vaidehi S. Natu (UTSW: University of Texas Southwestern Medical Center)
#2Jui-Jui Lin (UTSW: University of Texas Southwestern Medical Center)H-Index: 2
Last.Bradley Lega (UTSW: University of Texas Southwestern Medical Center)H-Index: 17
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Neuroimaging experiments implicate the posterior cingulate cortex (PCC) in episodic memory processing, making it a potential target for responsive neuromodulation strategies outside of the hippocampal network. However, causal evidence for the role PCC plays in memory encoding is lacking. In human female and male participants (N=17) undergoing seizure mapping, we investigated functional properties of the PCC using deep brain stimulation (DBS) and stereotactic electroencephalography (stereo EEG). ...
#1Marianne de Chastelaine (UTD: University of Texas at Dallas)H-Index: 13
#2Brian E. Donley (UTD: University of Texas at Dallas)H-Index: 5
Last.Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 92
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Abstract Findings from cross-sectional and longitudinal magnetic resonance imaging (MRI) studies indicate that cortical thickness declines across the adult lifespan, with regional differences in rate of decline. Global and regional thickness have also been found to co-vary with cognitive performance. Here we examined the relationships between age, mean cortical thickness, and associative recognition performance across three age groups (younger, middle-aged and older adults; total n = 133). Measu...
#1Sarah Seger (UTSW: University of Texas Southwestern Medical Center)H-Index: 1
#2Michael D. Rugg (University of Texas at Austin)H-Index: 92
Last.Bradley Lega (UTSW: University of Texas Southwestern Medical Center)H-Index: 17
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A critical and emerging question in human episodic memory is how the hippocampus interacts with the prefrontal cortex during the encoding and retrieval of items and their contexts. In the present study, participants performed an episodic memory task (free recall) while intracranial electrodes were simultaneously inserted into the hippocampus and multiple prefrontal locations, allowing the quantification of relative onset times of gamma band activity in the cortex and the hippocampus in the same ...
#1Joshua D. Koen (ND: University of Notre Dame)H-Index: 10
#2Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 92
Many cognitive abilities decline with age even in the absence of detectable pathology. Recent evidence indicates that age-related neural dedifferentiation, operationalized in terms of neural selectivity, may contribute to this decline. We review here work exploring the relationship between neural dedifferentiation, cognition, and age. Compelling evidence for age effects on neural selectivity comes from both non-human animal and human research. However, current data suggest that age does not mode...
#1Preston P. Thakral (Harvard University)H-Index: 11
#2Tracy H. Wang (University of Texas at Austin)H-Index: 10
Last.Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 92
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Abstract Using functional magnetic resonance imaging data, we assessed whether across-participant variability of content-selective retrieval-related neural activity differs with age. We addressed this question by employing across-participant multi-voxel pattern analysis (MVPA), predicting that increasing age would be associated with reduced variability of retrieval-related cortical reinstatement across participants. During study, 24 young and 24 older participants viewed objects and concrete wor...
#1Roberto Cabeza (Duke University)H-Index: 83
#2Marilyn Albert (Johns Hopkins University)H-Index: 108
Last.M. Natasha Rajah (McGill University)H-Index: 15
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#1Gray Umbach (UTSW: University of Texas Southwestern Medical Center)
#2Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 92
Last.Bradley Lega (UTSW: University of Texas Southwestern Medical Center)H-Index: 17
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Mathematical reasoning is central to everyday life. Lesion data and functional MRI studies suggest that even simple arithmetic involves the coordination of multiple spatially diverse brain regions, but to date, math processing has not been well characterized using direct brain recordings, especially outside of the parietal cortex. To address this, we utilized an unparalleled data set of 310 subjects implanted with intracranial electrodes to investigate the spatial and temporal dynamics of arithm...
#1Jui Jui Lin (UTSW: University of Texas Southwestern Medical Center)
#2Gray Umbach (UTSW: University of Texas Southwestern Medical Center)
Last.Bradley Lega (UTSW: University of Texas Southwestern Medical Center)H-Index: 17
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The question of whether the anterior and posterior hippocampus serve different or complementary functional roles during episodic memory processing has been motivated by noteworthy findings in rodent experiments and from noninvasive studies in humans. Researchers have synthesized these data to postulate several models of functional specialization, However, the issue has not been explored in detail using direct brain recordings. We recently published evidence that theta power increases during epis...
#1Joshua D. Koen (ND: University of Notre Dame)H-Index: 10
#2Nedra Hauck (UTD: University of Texas at Dallas)H-Index: 2
Last.Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 92
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Healthy aging is associated with decreased neural selectivity (dedifferentiation) in category-selective cortical regions. This finding has prompted the suggestion that dedifferentiation contributes to age-related cognitive decline. Consistent with this possibility, dedifferentiation has been reported to negatively correlate with fluid intelligence in older adults. Here, we examined whether dedifferentiation is associated with performance in another cognitive domain — episodic memory — that is al...
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