The development of memory efficiency and value-directed remembering across the life span: A cross-sectional study of memory and selectivity.

Although attentional control and memory change considerably across the life span, no research has examined how the ability to strategically remember important information (i.e., value-directed remembering) changes from childhood to old age. The present study examined this in different age groups across the life span (N = 320, 5–96 years old). A selectivity task was used in which participants were asked to study and recall items worth different point values in order to maximize their point score. This procedure allowed for measures of memory quantity/capacity (number of words recalled) and memory efficiency/selectivity (the recall of high-value items relative to low-value items). Age-related differences were found for memory capacity, as young adults recalled more words than the other groups. However, in terms of selectivity, younger and older adults were more selective than adolescents and children. The dissociation between these measures across the life span illustrates important age-related differences in terms of memory capacity and the ability to selectively remember high-value information. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Memory efficiency and the strategic control of attention at encoding: Impairments of value-directed remembering in Alzheimer’s disease.

Selecting what is important to remember, attending to this information, and then later recalling it can be thought of in terms of the strategic control of attention and the efficient use of memory. To examine whether aging and Alzheimer’s disease (AD) influenced this ability, the present study used a selectivity task, where studied items were worth various point values and participants were asked to maximize the value of the items they recalled. Relative to younger adults (N = 35) and healthy older adults (N = 109), individuals with very mild AD (N = 41), and mild AD (N = 13) showed impairments in the strategic and efficient encoding and recall of high value items. Although individuals with AD recalled more high value items than low value items, they did not efficiently maximize memory performance (as measured by a selectivity index) relative to healthy older adults. Performance on complex working memory span tasks was related to the recall of the high value items but not low value items. This pattern suggests that relative to healthy aging, AD leads to impairments in strategic control at encoding and value-directed remembering. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Betting on memory leads to metacognitive improvement by younger and older adults.

The present study examined how younger and older adults choose to selectively remember important information. Participants studied words paired with point values, and “bet” on whether they could later recall each word. If they bet on and recalled the word, they received the points, but if they failed to recall it, they lost those points. Participants (especially older adults) initially bet on more words than they later recalled, but greatly improved with task experience. The incorporation of rewards and penalties associated with metacognitive predictions, and multiple study-test trials, revealed that both younger and older adults can learn to maximize performance. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

The use of source memory to identity one's own episodic confusion errors.

In 4 category cued recall experiments, falsely recalled nonlist common members, a semantic confusion error participants. Errors were more likely if critical nonlist words were presented on an incidental task, causing source memory failures called episodic confusion errors . Participants could better identify the source of falsely recalled words if they had deeply processed the words on the incidental task. For deep but not shallow processing, participants could reliably include or exclude incidentally shown category members in recall. The illusion that critical items actually appeared on categorized lists was diminished but not eradicated when participants identified episodic confusion errors post hoc among their own recalled responses; participants often believed that critical items had been on both the incidental task and the study list. Improved source monitoring can potentially mitigate episodic (but not semantic) confusion errors. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Maximizing the benefits and minimizing the costs of repeated memory tests for older adults.

Repeatedly trying to remember information can help people remember more but can also lead to inaccuracies. Two experiments examined whether the costs of repeated recall efforts can be minimized for older adults by using memory tests that require specification of the source of recalled items. Participants saw and imagined pictures and then took 3 successive recall tests in which they either indicated the source of each remembered item (source recall) or simply recalled the items without specification of their source (free recall). Results showed that recall increased systematically from Test 1 to Test 3, although the rate of increase was less marked for older adults, and older adults recalled less overall. After the free recall tests, older adults made more source misattributions (claiming to have seen imagined items) than did young adults, but after the source recall tests, age differences were not significant. Thus, repeatedly recalling items while considering their source was associated with benefits in terms of increased recall and fewer costs in terms of source errors. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Imagery, encoding, and retrieval of information from memory: Some specific encoding-retrieval changes in Huntington's disease.

Used mixed lists of 10 high-imagery and 10 low-imagery words as stimuli in a prompted, free-recall experiment. On each trial, only words not recalled on the previous trial were presented again as stimuli. Normal controls recalled more words on each test of recall than did 8 41–53 yr old patients with Huntington's disease. Controls remembered more high-imagery words after fewer presentation trials and could recall them with greater consistency than low-imagery words. Patients with Huntington's disease required far more trials to remember words, never recalled all 20 words, and did not differentiate high- and low-imagery words with respect to their recall probability. Results indicate that these patients, unlike controls, cannot consistently retrieve responses that were recalled previously. Findings are discussed in terms of the relationship between encoding and retrieval processes. (17 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Creating false memories: Remembering words not presented in lists.

Two experiments (modeled after J. Deese's 1959 study) revealed remarkable levels of false recall and false recognition in a list learning paradigm. In Exp 1, Ss studied lists of 12 words (e.g., bed, rest, awake); each list was composed of associates of 1 nonpresented word (e.g., sleep). On immediate free recall tests, the nonpresented associates were recalled 40% of the time and were later recognized with high confidence. In Exp 2, a false recall rate of 55% was obtained with an expanded set of lists, and on a later recognition test, Ss produced false alarms to these items at a rate comparable to the hit rate. The act of recall enhanced later remembering of both studied and nonstudied material. The results reveal a powerful illusion of memory: People remember events that never happened. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Affective valence of words, explicit and implicit memory in clinical depression

Explicit and implicit memory for affectively valenced words (positive, negative or neutral) were investigated in 30 patients suffering from a major depressive episode (DSM-III-R criteria) and 30 normal control subjects. Explicit memory was assessed with a free-recall and a recognition task and implicit memory with a word-stem completion task. Depressed and control subjects recalled more emotional, i.e., positive and negative, words than neutral ones. They recognized less negative than neutral words. In contrast, to recall and recognition performance, word-completion performance was not sensitive to the affective valence of words: depressed and control subjects exhibited equivalent priming of positive, negative and neutral words. These results indicate that, in depressed and normal subjects, the affective valence of words influences memory when conscious, intentional recollection is required but is devoid of effect when such a recollection is not required.     

Directed forgetting of emotional stimuli in borderline personality disorder.

On the basis of clinical literature, the authors hypothesized that individuals with borderline personality disorder (BPD) would show biased information processing when they were exposed to negative affective stimuli of a particular type. Individuals with BPD and controls were tested using a directed forgetting paradigm. Study participants were exposed to 3 types of words (borderline, neutral, positive) and were cued to either remember or forget each word as it was presented. There were no group differences on a free recall task for words in the remember condition. However, participants with BPD recalled significantly more of the borderline words from the forget condition than did controls. In other words, borderline participants remembered borderline words that they were instructed to forget. These results may be consistent with enhanced encoding of salient words and perhaps related themes in BPD individuals. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Children's generation and communication of mnemonic organizational strategies.

Using a series of alternating sort/recall trials, whether 108 1st, 3rd, and 6th graders' experience with categorically related items would facilitate their subsequent organization and recall of low-associated items was explored. Results indicate that 3rd graders exposed to the categorized materials recalled more low-associated items and demonstrated greater organization in sorting and recall than did 3rd graders with previous experience with low-associated materials. Sixth graders' performance with low-associated materials was not affected by their previous experience. Following the memory task, each S provided answers to a series of metamemory questions and then instructed a 1st-grade child in how to perform the memory task. The instructions given to the 1st graders, as well as the performance of these younger children, reflected the older children's differential experience with taxonomic vs low-associated materials. (21 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Encoding and retrieval operations in relation to age.

In 2 experiments, the memory performance of a total of 40 young (mean age 18 yrs) and 40 elderly (mean age 75 yrs) Ss was compared in a procedure that allowed testing of the target words twice, first for recognition and then for cued recall. Conventional analyses of the recall and recognition data gave results that echoed previous findings that (a) significant age differences were found in recall but not in recognition, and (b) the recall differences were minimized when the target items were recalled in the context of cues highly related to the target items. In accordance with contemporary theoretical conceptions of memory, a feasible interpretation of these results is that memory loss is due to a retrieval deficit. However, further analyses showed that both young and older Ss failed to recognize many words that they subsequently recalled, suggesting that some caution is necessary in interpreting overall recall and recognition memory performance. Possible differences in encoding and retrieval processes as a function of age are discussed. (18 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

"Big" versus "little" science: comparative analysis of program projects and individual research grants

The verbal fluency task requires generation of category exemplars and appears to be an example of what M. Moscovitch (1995) calls a strategic test of memory retrieval. Four experiments explored the role of individual differences in working memory (WM) capacity on verbal fluency under various secondary load conditions. High WM participants consistently recalled more exemplars. However, load conditions caused a decline in recall only for high WM participants. Low WM participants showed no effect of secondary workload on exemplar generation. WM group differences and load effects were observed even in the 1st min of retrieval, which suggests that differences were not due to differences in knowledge. A model of retrieval is supported that relies on cue-based-automatic activation, monitoring of output for errors, controlled suppression of previously recalled items, and controlled strategic search.     

Trauma, mental representation, and the organization of memory for mother-referent material

Research on the effects of child maltreatment and exposure to community violence suggests that children who experience these types of traumatic events may be at risk for alterations and biases in attention and memory similar to those that have been observed in adults suffering from traumatic stress reactions. Along these lines, attachment theory posits that representational models of relationships also may act as moderators of similar cognitive biases by selectively guiding children's attention to and processing of interpersonal stimuli. Building upon the trauma and attachment literatures, the present investigation examined the links among trauma, representational models of caregivers, and children's memory for mother-relevant information using an incidental recall task in a sample of maltreated (n = 71) and nonmaltreated (n = 102) children between the ages of 8 and 13 years. Results were consistent with the hypothesis that experiences of trauma and representational models of caregivers are associated with differences in the way children process and retrieve information about positive and negative mother attribute words. In particular, experiences of trauma initially were associated with increased insecurity in children's representational models. Moreover, the interaction of traumatic experience and security of mental representation predicted children's recall for mother attribute words: victimized children with insecure models recalled the highest proportion of negative mother stimuli. Trauma and mental representation did not have a consistent effect on structurally encoded aspects of recall. Results were discussed in terms of the ways in which children who have experienced trauma process information about their worlds. The importance of assessing functioning in multiple developmental domains when studying memory also was discussed.     

Directed forgetting of trauma cues in adult survivors of childhood sexual abuse with and without posttraumatic stress disorder

The authors used a directed-forgetting task to investigate whether psychiatrically impaired adult survivors of childhood sexual abuse exhibit an avoidant encoding style and impaired memory for trauma cues. The authors tested women with abuse histories, either with or without posttraumatic stress disorder (PTSD), and women with neither abuse histories nor PTSD. The women saw intermixed trauma words (e.g., molested), positive words (e.g., confident), and categorized neutral words (e.g., mailbox) on a computer screen and were instructed either to remember or to forget each word. Relative to the other groups, the PTSD group did not exhibit recall deficits for trauma-related to-be-remembered words, nor did they recall fewer trauma-related to-be-forgotten words than other words. Instead, they exhibited recall deficits for positive and neutral words they were supposed to remember. These data are inconsistent with the hypothesis that impaired survivors exhibit avoidant encoding and impaired memory for traumatic information.     

Free recall by in-school and out-of-school adults: Performance and metamemory.

40 women in 4 groups (university students aged 18–26 or 35–44 yrs and out-of-school Ss aged 36–49 or 60–86 yrs) were asked to study and recall a randomly presented categorized word list. Ss then indicated which of a group of 20 mnemonic strategies they had used to remember the word list and ranked the 20 strategies according to usefulness in the memory task. On almost all measures (number of words recalled, number of words recalled per category, number of strategies employed, use of the various strategies, and perceived usefulness of the strategies), the 2 in-school groups were more similar to each other, and the 2 out-of-school groups were more similar to each other, than were the 2 middle-aged groups. ANCOVA, using years of schooling as the covariate, reduced several of the differences between the 2 middle-aged groups. Years of schooling, as well as actually being in school, may be better predictors than age of differences in metamemory and memory performance. (11 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The role of working memory capacity in retrieval.

The verbal fluency task that requires generation of category exemplars and appears to be an example of what M. Moscovitch (1995) calls a strategic test of memory retrieval. Four experiments explored the role of individual differences in working memory (WM) capacity on verbal fluency under various secondary load conditions. High WM participants consistently recalled more exemplars. However, load conditions caused a decline in recall only for high WM participants. Low WM participants showed no effect of secondary workload on exemplar generation. WM group differences and load effects were observed even in the 1st min of retrieval, which suggests that differences were not due to differences in knowledge. A model of retrieval is supported that relies on cue-based-automatic activation, monitoring of output for errors, controlled suppression of previously recalled items, and controlled strategic search. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Immediate serial recall, word frequency, item identity and item position.

Investigated the effect of frequency on item recall using phonologically similar vs distinct lists within a standard immediate serial recall paradigm. 18 Ss (mean age 29 yrs) completed an immediate serial recall task, where the lists to be recalled consisted of either high-, medium-, or low-frequency items and were also either phonologically similar or distinct. Results show that increasing frequency enhanced item information recall but had no effect on order recall. Conversely, increasing phonological similarity had a detrimental effect on order recall but no significant effect on item recall. The authors maintain that both results reflect retrieval processes where degraded representations are reconstructed on the basis of long-term knowledge. Low-frequency words have reduced accessibility, lowering the probability of correct reconstruction, and phonologically similar items are more easily confused with other recall candidates. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Organization versus item effects of an elaborated knowledge base on children's memory.

Investigated the extent to which the high levels of recall and organization observed when children are asked to recall their classmates' names (class recall) can be attributed to organizational vs item-specific effects. Ss were 109 1st, 3rd, and 5th graders. Levels of clustering in class recall were elevated when Ss were constrained to recall their classmates' names according to specific organizational schemes (either sex or seating arrangement). However, there was no evidence that changes in levels or styles of organization influenced levels of memory performance or which names were recalled. Results indicate that some of the benefits on memory of an elaborated knowledge base cannot be attributed to differences in organization (either strategic or automatic) but rather are due to differences in the ease with which individual items can be retrieved. (39 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Memory for emotional trait adjectives in clinically depressed youth

An experiment was conducted to examine memory for emotional trait adjectives in depressed children and adolescents. Two groups of children and adolescents, clinically depressed participants and non-clinical controls, were compared on computerized versions of recall and recognition memory tasks. Three groups of words (positive trait adjectives, negative trait adjectives, and categorized neutral words) were used in the experiment. Results showed that the depressed group recalled significantly more negative adjectives than positive adjectives, whereas the control group recalled the same number of positive and negative adjectives. This effect was predicted by the association between age and level of depression, with the depression-related bias becoming stronger with age. Signal detection analysis revealed that the depressed group did not show any bias in the recognition task. The findings are discussed with respect to cognitive theories of depression with consideration of the developmental implications.