Episodic simulation of past and future events in older adults: Evidence from an experimental recombination task.

We recently reported that older adults generate fewer episodic details than younger adults when remembering past events and when simulating future events. We suggested that the simulation findings reveal an age deficit in recombining episodic details into novel events, but they could also result from older adults “recasting” entire past events as future events. In this study, we used an experimental recombination paradigm to prevent recasting while imagining and to compare imagining the future with imagining the past. Older adults generated fewer episodic details for imagined and recalled events than younger adults, thereby extending the age-related simulation deficit to conditions of recombination. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Aging, source memory, and misrecollections.

The authors propose an illusory recollection account of why cognitive aging is associated with episodic memory deficits. After listening to statements presented by either a female or a male speaker, older adults were prone to misrecollecting past events. The authors' illusory recollection account is instantiated in a new illusory recollection signal detection model that provides a better fit of older adults' data than does the standard signal detection model. They observed that age-related differences in source memory (as measured by source d′ scores) virtually disappear after accounting for the occurrence of illusory recollections. These data suggest that age-related source memory impairments are not due to older adults' remembering less diagnostic source information and having to guess more. Instead, older adults appear to misremember past events more often than younger adults. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The structural organization of the mental lexicon and its contribution to age-related declines in spoken-word recognition.

Three experiments were conducted within the framework of the Neighborhood Activation Model of spoken-word recognition to study how the structural organization of the mental lexicon may contribute to age-related declines in spoken-language processing. Experiment 1 showed that the number and frequency of words that are phonetically similar to a target word had differential effects on perceptual identification in older and younger adults, with older adults being particularly disadvantaged in identifying hard words (words phonetically similar to many other high-frequency words). Experiment 2 showed that age-related deficits in the ability to identify hard words remained under conditions in which performance for a set of easy words (items phonetically similar to relatively few other low-frequency words) was the same for older and younger adults. In Experiment 3, reducing the resources available for identification by changing from single to multiple talkers reduced word recognition more among older than younger adults. Diminished cognitive resources, impaired inhibitory control, and increased general slowing are discussed as explanations for the results. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Aging and source monitoring.

This experiment was designed to examine the ability of older and younger adults to remember the source of information. Three types of source monitoring tasks were investigated: discriminating between externally derived and internally generated memories, discriminating between two types of internally generated memories, and discriminating between two types of externally derived memories. Relative to younger adults, older adults had more difficulty discriminating between memories of the same class (external–external and internal–internal), but they did not have more difficulty discriminating between memories of different classes (external–internal). These findings indicate that the age-related difficulty in remembering the source of information should not be characterized as a general deficit. Factors that may account for age deficits in source monitoring are discussed drawing upon the Johnson–Raye (1981) reality monitoring framework. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

More data-driven processing at retrieval reduces age-related memory deficits.

The environmental support hypothesis postulates that it may be possible to reduce older adults' deficits in episodic memory by providing environmental support at the encoding and/or retrieval phases. To examine the validity of this hypothesis, we varied the amount of retrieval support by manipulating data-driven processes. Young and older adults performed a word-stem cued recall task under a low data-driven condition (LDDC) in which the retrieval cue comprised 3 letters, and a higher data-driven condition (HDDC) in which the cue comprised 4 letters. Older adults benefitted more than younger adults from the additional support. Older adults exhibited a large deficit relative to younger adults in the LDDC condition but no age differences were found in the HDDC condition. These findings demonstrate that age-related memory deficits can be reduced by increasing the environmental support at retrieval associated with the data-driven component of retrieval processing. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Adult age differences in storage-retrieval processes: A stages-of-learning analysis of developmental interactions in concreteness effects.

In standard list-learning experiments, Age × Treatment interactions have been regarded as an important source of information regarding the locus (storage/retrieval) of age-related memory deficits in adulthood. Unfortunately, these interactions may be spurious byproducts of the use of fixed-trials designs in which age and completeness of learning are confounded. In this paper, we report two experiments in which these problems were explored in the context of item concreteness effects in young and old adults' free recall. In each experiment, eighty 20-year-olds and forty-two 70-year-olds memorized a 16-item list to a stringent acquisition criterion. The manipulations were pictures versus words (Exp. 1) and concrete versus abstract nouns (Exp. 2). The data were analyzed using a recently developed two-stage model that delivers numerical estimates of the impact of these manipulations on the storage and retrieval components of recall. For Experiment 1, the results showed that: (a) for young adults, pictures were easier to store and retrieve than words; (b) for old adults, there was a pictorial superiority effect at storage but a marked pictorial inferiority effect at retrieval; and (c) although younger adults were better than older adults at storing pictures and words and at retrieving pictures, older adults were better than younger adults at retrieving words. For Experiment 2, the results showed that: (a) on average, concrete words were easier to store and retrieve than abstract words at both age levels; and (b) on average, although younger adults were better than older adults at storing concrete and abstract words and at retrieving abstract words, older adults were better than younger adults at retrieving concrete words. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The effects of attention on age-related relational memory deficits: Evidence from a novel attentional manipulation.

Healthy aging is often accompanied by episodic memory decline. Prior studies have consistently demonstrated that older adults show disproportionate deficits in relational memory (RM) relative to item memory (IM). Despite rich evidence of an age-related RM deficit, the source of this deficit remains unspecified. One of the most widely investigated factors of age-related RM impairment is a reduction in attentional resources. However, no prior studies have demonstrated that reduced attentional resources are the critical source of age-related RM deficits. Here, we used qualitatively different attention tasks and tested whether reduced attention for relational processing underlies the RM deficit observed in aging. In Experiment 1, we imposed either item-detection or relation-detection attention tasks on young adults during episodic memory encoding and found that only the concurrent attention task that involves relational processing disproportionately impaired RM performance in young adults. Moreover, by ruling out the possible confound of task difficulty on the disproportionate RM impairment, we further demonstrated that reduced relational attention is a key factor for the age-related RM deficit. In Experiment 2, we replicated the results from Experiment 1 by using different materials of stimuli and found that the effect of relational attention on RM is material general. The results of Experiment 2 also showed that reducing attentional resources for relational processing in young adults strikingly equated their RM performance to that of older adults. Thus, this study documents the first evidence that reduced attentional resources for relational processing are a critical factor for the relational memory impairment observed in aging. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Search for semantic inhibition failure during sentence comprehension by younger and older adults.

The present research examined recent evidence that inhibition failures do not contribute to age-related declines in on-line text comprehension. Evaluating naming performance over a time course revealed that processes serving to eliminate thematically irrelevant information from memory in young adults were apparently deficient for older adults. Experiment 2 generalized these findings to contexts that rely on later information to disambiguate ambiguous words. Under these conditions, older adults were as able as younger adults to use context to disambiguate words. Despite the apparent disagreement between the experimental outcomes, it is argued that the present studies together are consistent and support the view that inhibition failures are unlikely to contribute to age differences in on-line sentence comprehension (at least) when the contexts are semantically constraining (i.e., self-contained). It is proposed that the detection of age-related inhibition failures may depend on the extent to which adults must rely on internally generated processing constraints. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Aging and prose memory: Tests of the resource-deficit hypothesis.

Two experiments tested predictions that age differences in processing resources underlie age differences in prose recall. Topic familiarity, text length, and speed of text presentation were manipulated and reduced the amount recalled in a manner consistent with the hypothesis that these variables would tax processing resources. The amount of information recalled was systematically lower in older adults, but age differences were not increased by the experimental manipulations as expected. However, measures of the putative processing resources did account for some of the age-related variance in prose recall, and relative memorability functions suggested that the experimental manipulations interfered with the quality of recall in older adults more than in younger adults. The outcome did not support the resource-deficit hypothesis as originally proposed and may best be understood in terms of factors other than age-related deficits in the measured amounts of processing resources. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Fast noisy speech: Age differences in processing rapid speech with background noise.

In order to investigate the effects of age on the ability to process speech under conditions of background noise, younger and older adults listened to and reported time-compressed spoken sentences presented with varying levels of background babble. Although the two age groups did not differ significantly in terms of either pure tone averages or in the ability to accurately report the sentences when they were presented in quiet, the older participants showed less tolerance for background noise than younger adults. This age difference in performance was further magnified by increased speech rates, suggesting that both age-related slowing of processing and reduced inhibition of distracting sounds may produce age deficits in speech processing. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Assessment of age-related changes in inhibition and binding using eye movement monitoring.

Age-related memory deficits may result from attending to too much information (inhibition deficit) and/or storing too little information (binding deficit). The present study evaluated the inhibition and binding accounts by exploiting a situation in which deficits of inhibition should benefit relational memory binding. Older adults directed more viewing toward abrupt onsets in scenes compared with younger adults under instructions to ignore any such onsets, providing evidence for age-related inhibitory deficits, which were ameliorated with additional practice. Subsequently, objects that served as abrupt onsets underwent changes in their spatial relations. Despite successful inhibition of the onsets, eye movements of younger adults were attracted to manipulated objects. In contrast, the eye movements of older adults, who directed more viewing to the late onsets compared with younger adults, were not attracted toward manipulated regions. Similar differences between younger and older adults in viewing of manipulated regions were observed under free viewing conditions. These findings provide evidence for concurrent inhibition and binding deficits in older adults and demonstrate that age-related declines in inhibitory processing do not lead to enhanced relational memory for extraneous information. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Attributions of Fluency in Fame Judgments by Younger and Older Adults.

Judgments about stimulus characteristics are affected by enhanced processing fluency that results from an earlier presentation of the stimulus. By monitoring for an episodic source of processing fluency, younger adults can more easily avoid this influence than can older adults. In Experiment 1, older adults discounted the effects of fluency when task demands encouraged the use of analytic judgments based on general knowledge, rather than an appeal to episodic source monitoring. Younger subjects were not reliably affected by these same task demands and their judgments continued to be affected by processing fluency. In Experiment 2, introduction of more stringent demands led younger adults also to discount the effects of fluency. We conclude that the influence of processing fluency on younger and older adults varies, depending on whether memory for source or general knowledge is put forward in place of fluency as a basis for judgments. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Age differences in reading with distraction: Sensory or inhibitory deficits?

Two experiments examined how sensory acuity affects age differences in susceptibility to interference in the reading-with-distraction task. In both experiments, older and younger adults read texts in an italic font and were required to ignore distractor words in an upright font. Experiment 1 examined whether the age-related increase in distractibility can be simulated in younger adults by reducing their visual acuity. Experiment 2 investigated whether the age differences in distractibility disappear if visual acuity is equated across all participants in both age groups. Both experiments showed that an impairment in visual acuity leads to increased interference in the reading-with-distraction task. However, older adults were much more impaired by the distractor material than younger adults with reduced visual acuity (Experiment 1). The age differences in the reading-with-distraction task persisted when visual acuity was equated between older and younger adults (Experiment 2). We conclude that the age-related increase in susceptibility to interference in the reading-with-distraction task is not solely due to perceptual deficits of older adults but arises from a deficit in higher cognitive processes such as inhibitory attention. Nevertheless, sensory acuity has to be taken into account as a potential confounding factor in perceptually demanding visual attention tasks. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Age-related deficits in reality monitoring of action memories.

The authors describe 3 theoretical accounts of age-related increases in falsely remembering that imagined actions were performed (A. K. Thomas & J. B. Bulevich, 2006). To investigate these accounts and further explore age-related changes in reality monitoring of action memories, the authors used a new paradigm in which actions were (a) imagined only, (b) actually performed, or (c) both imagined and performed. Older adults were more likely than younger adults to misremember the source of imagined-only actions, with older adults more often specifying that the action was imagined and also that it was performed. For both age groups, illusions that the actions were only performed decreased as repetitions of the imagined-only events increased. These patterns suggest that both older and younger adults use qualitative characteristics when making reality-monitoring judgments and that repeated imagination produces richer records of both sensory details and cognitive operations. However, sensory information derived from imagination appears to be more similar to that derived from performance for older adults than for younger adults. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A diffusion model analysis of adult age differences in episodic and semantic long-term memory retrieval.

Two experiments investigated adult age differences in episodic and semantic long-term memory tasks, as a test of the hypothesis of specific age-related decline in context memory. Older adults were slower and exhibited lower episodic accuracy than younger adults. Fits of the diffusion model (R. Ratcliff, 1978) revealed age-related increases in nondecisional reaction time for both episodic and semantic retrieval. In Experiment 2, an age difference in boundary separation also indicated an age-related increase in conservative criterion setting. For episodic old-new recognition (Experiment 1) and source memory (Experiment 2), there was an age-related decrease in the quality of decision-driving information (drift rate). As predicted by the context-memory deficit hypothesis, there was no corresponding age-related decline in semantic drift rate. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Do younger and older adults’ communicative goals influence off-topic speech in autobiographical narratives?

The present research investigated younger and older adults’ communicative goals and their effects on off-topic speech for autobiographical narratives. Participants indicated their communicative goals by rating preferences among paired goals, for example, focus–fascinating, one of which was designated as an expressive goal, appropriate for producing elaborative speech, and one of which was an objective goal, suited to producing concise speech. The participants then told stories about episodic and procedural topics, which were rated by groups of younger and older listeners. Age differences emerged in communicative goals, where younger adults clearly favored expressive goals for episodic topics and objective goals for procedural topics. In contrast, older adults’ goals were more diverse, consisting of a mixture of expressive and objective goals for both topic types, without a clear preference. Younger adults’ goals predicted ratings of off-topic speech assessed by listeners: Younger and older adults were perceived as equivalently focused, coherent, and clear for episodic topics, but older adults were perceived as less focused, less clear, and more talkative than younger adults on procedural topics. These results suggest that age-related changes in off-topic speech emerge as a result of younger adults selecting goals designed to produce more succinct stories. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Converging evidence that visuospatial cognition is more age-sensitive than verbal cognition.

In 3 separate experiments, the same samples of young and older adults were tested on verbal and visuospatial processing speed tasks, verbal and visuospatial working memory tasks, and verbal and visuospatial paired-associates learning tasks. In Experiment 1, older adults were generally slower than young adults on all speeded tasks, but age-related slowing was much more pronounced on visuospatial tasks than on verbal tasks. In Experiment 2, older adults showed smaller memory spans than young adults in general, but memory for locations showed a greater age difference than memory for letters. In Experiment 3, older adults had greater difficulty learning novel information than young adults overall, but older adults showed greater deficits learning visuospatial than verbal information. Taken together, the differential deficits observed on both speeded and unspeeded tasks strongly suggest that visuospatial cognition is generally more affected by aging than verbal cognition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)