Electrophysiological evidence for the effects of unitization on associative recognition memory in older adults

Zheng, Zhili; Li, Juan; Xiao, Fang; Broster, Lucas S.; Jiang, Yang

doi:10.1016/j.nlm.2015.03.006

Cited by 48 publications

(65 citation statements)

References 57 publications

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“…The beneficial effects of the experimentally induced unitization on older adults' source memory were accompanied by an enhanced familiarity-related mid-frontal old/new effect for the older adults. Along with previous studies that manipulated the unitization with pre-experimental unitized associations (Ahmad et al, 2015;Zheng et al, 2015b), these findings provide converging evidence for the promotional effects of unitization on the associative memory in older adults.…”

Section: Discussionsupporting

confidence: 70%

“…Both studies found that older adults exhibited better associative recognition on the compound word pairs relative to the unrelated words pairs. In addition, the older adults showed an enhanced familiarity-based retrieval in the unitized word pair condition (Zheng et al, 2015b), suggesting there are beneficial effects of the familiarity processes on the associative memory performance in older adults for pre-existing associations.…”

Section: Introductionmentioning

confidence: 92%

“…Two recent studies examined this question by using pre-experimentally unitized word associations (i.e., compound words) to manipulate unitization (Ahmad, Fernandes, & Hockley, 2015;Zheng, Li, Xiao, Broster, & Jiang., 2015b). Both studies found that older adults exhibited better associative recognition on the compound word pairs relative to the unrelated words pairs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Unitization improves source memory in older adults: An event-related potential study

Zheng

Xiao

et al. 2016

Neuropsychologia

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Section: Discussionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Unitization improves source memory in older adults: An event-related potential study

Zheng

Xiao

et al. 2016

Neuropsychologia

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“…Compared to pleasant and neutral contexts, objects embedded in unpleasant background scenes generated enhanced frontal ERP old/new differences between 300 and 500 ms. A number of studies propose that relational memory depends upon recollection-based mechanisms (Rugg & Curran, 2007;Wilding & Rugg, 1996). However, recent behavioral (Diana, Yonelinas, & Ranganath, 2008, 2010 and electrophysiological studies (Addante, Raganath, & Yonelinas, 2012;Diana, Van den Boom, Yonelinas, & Ranganath, 2011;Ecker, Zimmer, & GrohBordin, 2007a, b;Mollison & Curran, 2012;Peters & Daum, 2009;Speer & Curran, 2007;Tibon, Ben-Zvi, & Levy, 2014;Tibon, Gronau, Scheuplein, Mecklinger, & Levy, 2014;Tibon & Levy, 2014;Tsivilis et al, 2001;Zheng, Li, Xiao, Broster, & Jiang, 2015) have found that familiarity-related processes could also contribute to source recognition (Johnson, Hashtroudi, & Lindsay, 1993;Yonelinas, 2002). In an attempt to shed light on the familiarrelated processes embedded in source memory, Diana et al (2008Diana et al ( , 2010Diana et al, 2011) investigated the impact of encoding processes on familiarity-based recognition.…”

Section: Discussionmentioning

confidence: 99%

“…In the same direction, a number of studies have observed that when item-source associations can be processed together at encoding, familiarity processes are also enhanced during recognition. Thus, when item and source information are encoded in the same modality (visual) vs. different modality (visual and auditory;Tibon, Ben-Zvi, et al, 2014;Tibon, Gronau, et al, 2014;Tibon & Levy, 2014), when the nature of the association item-source is intrinsic versus extrinsic (Ecker et al, 2007a, b;Zheng et al, 2015), or when source refers to salient contextual information (Mollison & Curran, 2012), source recognition prompts larger familiarity-related ERPs, suggesting that memory for source information is strengthened (Addante et al, 2012;Chiu et al, 2013;Curran, 2004). In the present study, no explicit instructions for unitization were given; however, as commented above, we promoted item-context binding processes at encoding.…”

Section: Discussionmentioning

confidence: 99%

Binding neutral information to emotional contexts: Brain dynamics of long-term recognition memory

Ventura‐Bort

Löw

Wendt

et al. 2015

Cogn Affect Behav Neurosci

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There is abundant evidence in memory research that emotional stimuli are better remembered than neutral stimuli. However, effects of an emotionally charged context on memory for associated neutral elements is also important, particularly in trauma and stress-related disorders, where strong memories are often activated by neutral cues due to their emotional associations. In the present study, we used event-related potentials (ERPs) to investigate long-term recognition memory (1-week delay) for neutral objects that had been paired with emotionally arousing or neutral scenes during encoding. Context effects were clearly evident in the ERPs: An early frontal ERP old/new difference (300-500 ms) was enhanced for objects encoded in unpleasant compared to pleasant and neutral contexts; and a late centralparietal old/new difference (400-700 ms) was observed for objects paired with both pleasant and unpleasant contexts but not for items paired with neutral backgrounds. Interestingly, objects encoded in emotional contexts (and novel objects) also prompted an enhanced frontal early (180-220 ms) positivity compared to objects paired with neutral scenes indicating early perceptual significance. The present data suggest that emotional-particularly unpleasantbackgrounds strengthen memory for items encountered within these contexts and engage automatic and explicit recognition processes. These results could help in understanding binding mechanisms involved in the activation of trauma-related memories by neutral cues.

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Visual integration of objects and scenes increases recollection‐based responding despite differential MTL recruitment in young and older adults

Memel¹,

Ryan

2018

Hippocampus

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Unitization, the process of encoding previously independent units as one coherent representation, improves associative memory in both young and older adults, or in some cases, differentially benefits older adults. Unitization of verbal associative pairs may reduce reliance on the hippocampus (HC) for successful encoding and recognition by shifting to familiarity-based processing mediated by perirhinal cortex (PRC). However, this shift was not observed in a recent study of visual associative memory, with equivalent activation in HC and PRC during encoding of visually integrated (unitized) and nonintegrated object and scene pairs. Furthermore, behavioral findings from this study suggested an increase in recollection rather than familiarity during recognition of visually integrated pairs. The present study extends our previous work by focusing on the influence of visual integration on fMRI activation during associative recognition, rather than encoding and these patterns between young and older adults. In contrast to our findings from encoding, visual integration reduced HC and PRC activation during retrieval of object and scene associative pairs across both age groups. However, visual integration increased the correlation between bilateral HC and left parahippocampal (PHC) activation and behavioral performance among older adults, consistent with an increased reliance on recollection. In contrast, visual integration reduced the correlation between HC activation and behavioral performance in young adults, more consistent with findings from the verbal unitization literature. Taken together, these results suggest that associative memory for visually integrated pairs may involve differential recruitment of medial temporal regions in young and older adults.

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Electrophysiological evidence for the effects of unitization on associative recognition memory in older adults

Cited by 48 publications

References 57 publications

Unitization improves source memory in older adults: An event-related potential study

Unitization improves source memory in older adults: An event-related potential study

Binding neutral information to emotional contexts: Brain dynamics of long-term recognition memory

Visual integration of objects and scenes increases recollection‐based responding despite differential MTL recruitment in young and older adults

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