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Joshua D. Koen
University of Notre Dame
RecallPsychologyCognitionCognitive psychologyRecognition memory
26Publications
12H-index
684Citations
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Publications 24
Newest
#1E. S. Liu (UTD: University of Texas at Dallas)
#2Joshua D. Koen (ND: University of Notre Dame)H-Index: 12
Last. Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 95
view all 3 authors...
Pre-stimulus subsequent memory effects (SMEs), differences in neural activity preceding the onset of study items that are predictive of later memory performance, have consistently been reported in young adults. The present fMRI experiment investigated potential age-related differences in pre-stimulus SMEs. During study, healthy young and older participants made one of two semantic judgments on images, with the judgment signaled by a preceding cue. In the test phase, participants first made an it...
Source
#1Sabina Srokova (UTD: University of Texas at Dallas)H-Index: 1
#2Paul F. Hill (UTD: University of Texas at Dallas)H-Index: 1
Last. Michael D. Rugg (UEA: University of East Anglia)H-Index: 95
view all 5 authors...
The aging brain is characterized by neural dedifferentiation – an apparent decrease in the functional selectivity of category-selective cortical regions. Age-related reductions in neural differentiation have been proposed to play a causal role in cognitive aging. Recent findings suggest, however, that age-related dedifferentiation is not equally evident for all stimulus categories and, additionally, that the relationship between neural differentiation and cognitive performance is not moderated b...
Source
#1Erin D. Horne (UTD: University of Texas at Dallas)H-Index: 2
#2Joshua D. Koen (ND: University of Notre Dame)H-Index: 12
Last. Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 95
view all 4 authors...
Abstract In young adults, the neural correlates of successful recollection vary with the specificity (or amount) of information retrieved. We examined whether the neural correlates of recollection are modulated in a similar fashion in older adults. We compared event-related potential (ERP) correlates of recollection in samples of healthy young and older adults (N = 20 per age group). At study, participants were cued to make one of two judgments about each of a series of words. Subsequently, part...
2 CitationsSource
#1Joshua D. Koen (ND: University of Notre Dame)H-Index: 12
#2Sabina Srokova (UTD: University of Texas at Dallas)H-Index: 1
Last. Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 95
view all 3 authors...
This review focuses on possible contributions of neural dedifferentiation to age-related cognitive decline. Neural dedifferentiation is held to reflect a breakdown in the functional specificity of brain regions and networks that compromises the fidelity of neural representations supporting episodic memory and related cognitive functions. The evidence for age-related dedifferentiation is robust when it is operationalized as neural selectivity for different categories of perceptual stimuli or as d...
1 CitationsSource
#1Sabina Srokova (UTD: University of Texas at Dallas)H-Index: 1
Last. Michael D. RuggH-Index: 95
view all 5 authors...
The aging brain is characterized by neural dedifferentiation - an apparent decrease in the functional selectivity of category-selective cortical regions. Age-related reductions in neural differentiation have been proposed to play a causal role in cognitive aging. Recent findings suggest, however, that age-related dedifferentiation is not equally evident for all stimulus categories and, additionally, that the relationship between neural differentiation and cognitive performance is not moderated b...
Source
#1Joshua D. Koen (ND: University of Notre Dame)H-Index: 12
#2Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 95
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...
3 CitationsSource
#1Joshua D. Koen (ND: University of Notre Dame)H-Index: 12
#2Nedra Hauck (UTD: University of Texas at Dallas)H-Index: 2
Last. Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 95
view all 3 authors...
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...
13 CitationsSource
#1Joshua D. Koen (UTD: University of Texas at Dallas)H-Index: 12
#2Preston P. Thakral (Harvard University)H-Index: 13
Last. Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 95
view all 3 authors...
ABSTRACTThe left angular gyrus (AG) is thought to play a critical role in episodic retrieval and has been implicated in the recollection of specific details of prior episodes. Motivated by recent fMRI studies in which it was reported that elevated neural activity in left AG during study is predictive of subsequent associative memory, the present study investigated whether the region plays a causal role in associative memory encoding. Participants underwent online transcranial magnetic stimulatio...
1 CitationsSource
#1Joshua D. Koen (UTD: University of Texas at Dallas)H-Index: 12
#2Erin D. Horne (UTD: University of Texas at Dallas)H-Index: 2
Last. Michael D. Rugg (UTD: University of Texas at Dallas)H-Index: 95
view all 4 authors...
Prestimulus subsequent memory effects (preSMEs)—differences in neural activity elicited by a task cue at encoding that are predictive of later memory performance—are thought to reflect differential engagement of preparatory processes that benefit episodic memory encoding. We investigated age differences in preSMEs indexed by differences in ERP amplitude just before the onset of a study item. Young and older adults incidentally encoded words for a subsequent memory test. Each study word was prece...
6 CitationsSource
#1Joshua D. Koen (UTD: University of Texas at Dallas)H-Index: 12
#2Frederick S. Barrett (JHUSOM: Johns Hopkins University School of Medicine)H-Index: 18
Last. Andrew P. Yonelinas (UC Davis: University of California, Davis)H-Index: 64
view all 4 authors...
Signal-detection theory, and the analysis of receiver-operating characteristics (ROCs), has played a critical role in the development of theories of episodic memory and perception. The purpose of the current paper is to present the ROC Toolbox. This toolbox is a set of functions written in the Matlab programming language that can be used to fit various common signal detection models to ROC data obtained from confidence rating experiments. The goals for developing the ROC Toolbox were to create a...
17 CitationsSource
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