Individual differences in executive functioning modulate age effects on the ERP correlates of retrieval success.

The present study aimed to investigate whether the level of executive functioning modulated the effects of aging on episodic memory performance and on the electrophysiological correlates of retrieval success ('old/new effect'). We used a differential approach in which young and older adults were divided into four groups of 14 participants according to their scores on a composite executive index: young-high, young-low, old-high and old-low. ERPs were recorded while participants performed a word-stem cued-recall task. Behavioral results demonstrated that age-related deficits in memory performance were reduced but not eliminated in individuals with a higher executive functioning level. Young participants exhibited ERP old/new effects on frontal and parietal areas. At posterior sites, the effect was entirely left-sided for young-low adults while for young-high participants it was bilateral, maximal at left sites and of greater amplitude. For the old-low group, both frontally-based and parietally-based processes appeared to be affected by the aging process. They also demonstrated a late frontal negative component, which might indicate an unsuccessful additional attempt to cope with retrieval difficulties. In the old-high group, ERP effects on frontal areas were relatively intact while the parietal effect was impaired compared to young adults. However, old-high subjects exhibited earlier, larger and more symmetrical effects than did old-low adults, which was in line with their better memory performance. These findings provide some support for the executive decline hypothesis of cognitive aging by showing that neural correlates of retrieval success in episodic memory are differentially affected by aging according to executive functioning level. They are consistent with the view that a high executive functioning level may help older adults recruit a cerebral pattern which enables them to perform a memory task more efficiently.

Angel L ，Fay S ，Bouazzaoui B ，Isingrini M ... -  《-》

Protective role of educational level on episodic memory aging: an event-related potential study.

The aim of the present experiment was to investigate whether educational level could modulate the effect of aging on episodic memory and on the electrophysiological correlates of retrieval success. Participants were divided into four groups based on age (young vs. older) and educational level (high vs. low), with 14 participants in each group. Event-related potentials (ERP) were recorded while participants performed a word-stem cued-recall task. Age-related memory deficits were greater for the less educated individuals. Age differences in the ERP old/new effects were also modulated by the level of education. This study demonstrated that the effects of age on episodic memory and ERP correlates of retrieval success are smaller in participants with high educational levels than those with lower levels. These findings provide support for the reserve hypothesis and highlight the need to consider individual differences when studying cognitive and cerebral changes in aging.

Angel L ，Fay S ，Bouazzaoui B ，Baudouin A ，Isingrini M ... -  《-》

The amount of retrieval support modulates age effects on episodic memory: evidence from event-related potentials.

This experiment was designed to explore the impact of age and amount of retrieval support on episodic memory and its electrophysiological correlates. Event-related potentials (ERPs) were recorded while young and older participants performed a word-stem cued-recall task in a low-support condition (LSC) in which the stem was composed of three letters, and a high-support condition (HSC) in which the cue consisted of four letters. Behavioral analyses showed that recall in the older group was less accurate than in the young group in the LSC, but no age differences were observed in the HSC. In the LSC, old/new ERP effects at frontal and parietal sites were later and less sustained for the older adults. Furthermore, the parietal old/new effect was symmetrically distributed for older adults, whereas it was predominant over the left hemisphere for their younger counterparts. In addition, young participants demonstrated early and long-lasting frontal and parietal effects in the HSC but with predominance over the right hemisphere, whereas the older adults exhibited a frontal effect and an early and long-lasting parietal effect becoming predominant over the left hemisphere. No age differences in the time course of the parietal old/new effect were observed in this more supportive condition. In addition, in the last period, the left parietal effect was greater for the older group. This study suggests that episodic memory performance and ERP correlates of recall processes are more similar between young and older adults when increased support is provided at retrieval.

Angel L ，Isingrini M ，Bouazzaoui B ，Taconnat L ，Allan K ，Granjon L ，Fay S ... -  《-》

Neural correlates of cued recall in young and older adults: an event-related potential study.

Angel L ，Fay S ，Bouazzaoui B ，Granjon L ，Isingrini M ... -  《-》

The effect of age on word-stem cued recall: a behavioral and electrophysiological study.

Osorio A ，Ballesteros S ，Fay S ，Pouthas V ... -  《-》