Parietal cortex tracks the amount of information retrieved even when it is not the basis of a memory decision

Guerin, Scott A.; Miller, Michael B.

doi:10.1016/j.neuroimage.2010.11.066

Cited by 49 publications

(42 citation statements)

References 36 publications

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“…Guerin andMiller 2011). This interpretation is supported by prior research suggesting that IPS activity during perceptual decisions in humans (Ploran et al 2007;Heekeren et al 2008;Tosoni et al 2008;Kayser et al 2010;Ploran et al 2011, cf.…”

Section: Dorsal Ppc: Lateral Ips Versus Splsupporting

confidence: 71%

“…This interpretation is supported by prior research suggesting that IPS activity during perceptual decisions in humans (Ploran et al 2007;Heekeren et al 2008;Tosoni et al 2008;Kayser et al 2010;Ploran et al 2011, cf. Ho et al 2009Guerin and Miller 2011) and lateral intraparietal activity in nonhuman primates Newsome 1996, 2001;Schall 2003;Kiani et al 2008;Kiani and Shadlen 2009) is associated with the accumulation of evidence to guide perceptual decision making. In the present study, mnemonic evidence was objectively measured with source recollection and item recognition outcomes.…”

Section: Dorsal Ppc: Lateral Ips Versus Splmentioning

confidence: 99%

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Functional Heterogeneity in Posterior Parietal Cortex Across Attention and Episodic Memory Retrieval

et al. 2012

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While attention is critical for event memory, debate has arisen regarding the extent to which posterior parietal cortex (PPC) activation during episodic retrieval reflects engagement of PPCmediated mechanisms of attention. Here, we directly examined the relationship between attention and memory, within and across subjects, using functional magnetic resonance imaging attentionmapping and episodic retrieval paradigms. During retrieval, 4 functionally dissociable PPC regions were identified. Specifically, 2 PPC regions positively tracked retrieval outcomes: lateral intraparietal sulcus (latIPS) indexed graded item memory strength, whereas angular gyrus (AnG) tracked recollection. By contrast, 2 other PPC regions demonstrated nonmonotonic relationships with retrieval: superior parietal lobule (SPL) tracked retrieval reaction time, consistent with a graded engagement of top-down attention, whereas temporoparietal junction displayed a complex pattern of belowbaseline retrieval activity, perhaps reflecting disengagement of bottom-up attention. Analyses of retrieval effects in PPC topographic spatial attention maps (IPS0-IPS5; SPL1) revealed that IPS5 and SPL1 exhibited a nonmonotonic relationship with retrieval outcomes resembling that in the SPL region, further suggesting that SPL activation during retrieval reflects top-down attention. While demands on PPC attention mechanisms vary during retrieval attempts, the present functional parcellation of PPC indicates that 2 additional mechanisms (mediated by latIPS and AnG) positively track retrieval outcomes.

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Section: Dorsal Ppc: Lateral Ips Versus Splsupporting

confidence: 71%

Section: Dorsal Ppc: Lateral Ips Versus Splmentioning

confidence: 99%

Functional Heterogeneity in Posterior Parietal Cortex Across Attention and Episodic Memory Retrieval

et al. 2012

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“…For both the vPPC and dPPC, retrieval-related activity is typically left lateralized, although bilateral activity has also been observed (Guerin and Miller 2011;Henson et al, 1999;Shannon & Buckner, 2004;Vilberg & Rugg, 2008). Indeed, left-lateralized PPC activity has been observed for both nonverbal information (faces) and nonvisual information (see Guerin & Miller 2011;Klostermann et al, 2008;Shannon & Buckner, 2004).…”

Section: Parietal Contributions To Episodic Retrievalmentioning

confidence: 98%

“…Indeed, left-lateralized PPC activity has been observed for both nonverbal information (faces) and nonvisual information (see Guerin & Miller 2011;Klostermann et al, 2008;Shannon & Buckner, 2004). For example, Klostermann et al (2008) found left-lateralized PPC activation for auditory presentations (spoken words).…”

Section: Parietal Contributions To Episodic Retrievalmentioning

confidence: 99%

Episodic retrieval and the cortical binding of relational activity

Shimamura

2011

Cogn Affect Behav Neurosci

205

177

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Retrieval of episodic memories depends on the successful "re-collection" of event features, such as the time, place, people, thoughts, and feelings associated with a past experience.In neuroimaging studies, ventral regions of the posterior parietal cortex (vPPC) are particularly active when episodic memories are successfully retrieved. A review of the neural correlates of episodic retrieval is presented along with a new theory, cortical binding of relational activity (CoBRA). According to CoBRA, the vPPC acts as a convergence zone that binds episodic features stored in disparate neocortical regions. This process works in conjunction with other known mechanisms, such as those associated with the prefrontal cortex and medial temporal lobe.

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“…WM tasks consistently recruit cortical regions within the dorsolateral prefrontal cortex (DLPFC, Brodmann Area 9/46), the parietal cortex (PAR, BA7/40) and the dorsal anterior cingulate cortex (ACC, BA32) (Fletcher and Henson, 2001;Wager and Smith, 2003;Nee et al, 2013). Within this network, there is evidence for relative functional specialisation according to process; the DLPFC has been intimately linked to encoding, setting attentional priorities and manipulating information (D' Esposito et al, 2000;Narayanan et al, 2005), the PAR has been associated with maintaining attentional focus and storing information (Jonides et al, 1998;Guerin and Miller, 2011) and the ACC has been implicated in error detection and performance adjustment (Carter et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Dynamic causal modeling of load-dependent modulation of effective connectivity within the verbal working memory network

2013

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Permanent repository link AbstractNeuroimaging studies have consistently shown that working memory (WM) tasks engage a distributed neural network that primarily includes the dorsolateral prefrontal (DLPFC), the parietal (PAR) and the anterior cingulate cortices (ACC). The current challenge is to provide a mechanistic account of the changes observed in regional activity. To achieve this we characterised neuroplastic responses in effective connectivity between these regions at increasing WM loads using Dynamic Causal Modeling of functional magnetic resonance imaging data obtained from healthy individuals during a verbal n-back task. Our data demonstrate that increasing memory load was associated with (a) right-hemisphere dominance, (b) increasing forward (i.e. posterior to anterior) effective connectivity within the WM network, and (c) reduction in individual variability in WM network architecture resulting in the right-hemisphere forward model reaching an exceedance probability of 99% in the most demanding condition. Our results provide direct empirical support that task difficulty, in our case WM load, is a significant moderator of short-term plasticity, complementing existing theories of task-related reduction in variability in neural networks.

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Parietal cortex tracks the amount of information retrieved even when it is not the basis of a memory decision

Cited by 49 publications

References 36 publications

Functional Heterogeneity in Posterior Parietal Cortex Across Attention and Episodic Memory Retrieval

Functional Heterogeneity in Posterior Parietal Cortex Across Attention and Episodic Memory Retrieval

Episodic retrieval and the cortical binding of relational activity

Dynamic causal modeling of load-dependent modulation of effective connectivity within the verbal working memory network

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