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PubMed2000

Insights from semantic dementia on the relationship between episodic and semantic memory.

An influential theory of long-term memory, in which new episodic learning is dependent upon the integrity of semantic memory, predicts that a double dissociation between episodic and semantic memory is not possible in new learning. Contrary to this view, we found, in two separate experiments, that patients with impaired semantic memory showed relatively preserved performance on tests of recognition memory if the stimuli were perceptually identical between learning and test. A significant effect of semantic memory was only seen when a perceptual manipulation was introduced in the episodic task. To account for these findings, we propose a revision to current models of long-term memory, in which sensory/perceptual information and semantic memory work in concert to support new learning.

Aged↗
PubMed2002

Recognizing spatial patterns: a noisy exemplar approach.

Models of categorization typically rely on the use of stimuli composed of well-defined dimensions (e.g., Ashby & Maddox (1998) in Choice, decision, and measurement: Essays in honor of R. Duncan Luce, p. 251-301, Mahwah, NJ: Erlbaum). We apply a similar approach to the analysis of recognition memory. Using a version of short-term recognition paradigm (Sternberg, Science 153 (1966) 652), we asked whether NEMO Sternberg's, a noisy exemplar summed-similarity model, could account for variation in mean performance on individual trials. NEMO provided a very good overall fit to recognition data from three experiments. However, its failure to fit data for certain lists of stimuli suggested a revision of the summed-similarity assumption. Our model-based analysis showed that subjects used interitem similarity, in addition to probe-item similarity, as the basis for their decisions. This represents a major departure from existing recognition models that assume subjects' judgments depend exclusively on the summed similarity of the probe to the study items.

Discrimination, Psychological↗
PubMed2007

Cognitive rehabilitation in the elderly: effects on memory.

This study reports the effects of a 12-week multimodular cognitive rehabilitation training program on memory performance in two groups of older adults. In the Memory Training module, participants were instructed on the nature of memory and how to improve memory performance; internal and external strategies were described and practiced over the training sessions. Memory performance was assessed by four tests: Alpha Span, Brown-Peterson, Hopkins Verbal Learning Test - Revised (HVLT-R), and Logical Stories. One group received training on entry into the study (Early Training Group, ETG), the other after a 3-month delay (Late Training Group, LTG). The results showed no training-related improvement in working memory (Alpha Span), primary memory (Brown-Peterson, HVLT-R), or recognition memory (HVLT-R). While the most direct analyses of a training effect (analyses of covariance) rarely demonstrated significant effects, exploratory analyses provided some evidence for a training benefit in several measures of secondary memory (Logical Stories; HVLT-R) and strategic processing (Brown-Peterson; Logical Stories; HVLT-R). Positive results were largely restricted to the ETG, possibly because the LTG lost motivation as a consequence of their delayed training. The results need to be treated with caution, but are promising for the rehabilitation of memory functioning in older adults.

Aged↗
PubMed2006

On the psychology of the recognition heuristic: retrieval primacy as a key determinant of its use.

The recognition heuristic is a prime example of a boundedly rational mind tool that rests on an evolved capacity, recognition, and exploits environmental structures. When originally proposed, it was conjectured that no other probabilistic cue reverses the recognition-based inference (D. G. Goldstein & G. Gigerenzer, 2002). More recent studies challenged this view and gave rise to the argument that recognition enters inferences just like any other probabilistic cue. By linking research on the heuristic with research on recognition memory, the authors argue that the retrieval of recognition information is not tantamount to the retrieval of other probabilistic cues. Specifically, the retrieval of subjective recognition precedes that of an objective probabilistic cue and occurs at little to no cognitive cost. This retrieval primacy gives rise to 2 predictions, both of which have been empirically supported: Inferences in line with the recognition heuristic (a) are made faster than inferences inconsistent with it and (b) are more prevalent under time pressure. Suspension of the heuristic, in contrast, requires additional time, and direct knowledge of the criterion variable, if available, can trigger such suspension.

Adult↗
PubMed2003

The effects of aging and divided attention on memory for item and associative information.

The present study examined how aging and divided attention influence memory for item and associative information. Older adults and younger adults working under full-attention conditions and younger adults working under divided-attention conditions studied unrelated word pairs. Memory for item information was measured by later recognition of the 2nd word in the pair, and associative information was measured by recognition of the entire pair. Both older adults in the full-attention condition and younger adults in the divided-attention condition performed more poorly than younger adults in the full-attention condition, with the deficit in associative information being greater than the deficit in item information. In addition, a differentially greater associative decrement was found for the older adults, as shown by their heightened tendency to make false-alarm responses to re-paired (conjunction) distractors. The results are discussed in terms of an age-related reduction in processing resources compounded by an age-related increase in older adults' reliance on familiarity in associative recognition memory.

Adult↗
PubMed1998

Neural encoding of subject-object distance in a visual recognition system.

Domestic chicks follow a familiar (imprinted) object when it recedes. In behaving, imprinted chicks with no experience of objects at different distances, neuronal activity was recorded from the intermediate and medial part of the hyperstriatum ventrale (IMHV), a brain region crucial for the recognition memory underlying imprinting. We found that (i) some neurones responded equivalently, irrespective of the subject-object distance d (d-invariant); (ii) other neurones responded differently at different values of d (d-sensitive); (iii) these response types were found in monocular chicks and in chicks with both eyes exposed; (iv) the action potential shape of d-invariant neurones was different from that of other neurones and (v) the spontaneous firing rate of some neurones was correlated with locomotor activity. Taken together with previous findings, the results raise the possibility that IMHV has a major role to play in the sensory and motor-control aspects of imprinting in addition to its mnemonic functions.

Action Potentials↗
PubMed1991

On age differences in processing variability and scanning speed.

This investigation examined adult age differences on a recognition memory taks for order information. Experiment 1 consisted of a modified memory-scanning task in which a memory set of four letters was presented in boxes. Subjects judged whether a subsequent probe letter was or was not transposed from its original presentation position. One block of primary memory trials (i.e., no distractor task) and one block of secondary memory trials (i.e., a 10-second distractor task) were used. Experiment 2 used basically the same task, except both blocks of trials were primary memory tasks, and acoustic similarity was manipulated. A processing variability model predicted that both experiments should show distance effects (i.e., transposing letters a distance of one box should result in more errors and/or longer reaction times than a transposition of two, or three boxes) for both right and left transposition directions. However, a generalized slowing model predicted that distance effects should only occur for left transpositions (because of left-to-right scanning order). The present data supported the processing variability model but not the generalized slowing model.

Adolescent↗
PubMed1992

The effects of milacemide on item and source memory.

Prior research has shown that memory for facts and items (item memory) and memory for where one has learned these items (source memory) can be dissociated under certain conditions. In this study, we examined the effects of milacemide, a derivative of glycine, on memory for item and source information in healthy young and older adults. These results pointed to a dissociation between source memory and item memory: Milacemide administration seemed to facilitate memory for source information but did not affect recognition memory.

Acetamides↗
PubMed2006

Electrophysiological measures of familiarity memory.

Event-related potentials are a valuable tool for the study of human memory function. This selective review provides a brief introduction in models of recognition memory and then describes how ERPs can be used to investigate familiarity memory, an acontextual form of remembering that can be distinguished from the recollection of detailed information of prior events. ERP studies on the mid-frontal old/new effect, the putative electrophysiological correlate of familiarity memory are reviewed. It will be illustrated how familiarity memory is reflected in this effect, how it can electrophysiologically be dissociated from other forms of memory and which brain systems mediate this form of remembering. Recent studies will be reviewed that illustrate that familiarity is not only restricted to single items but can also support the retrieval of associative information.

Animals↗
PubMed2006

Combined pharmacological and electrophysiological dissociation of familiarity and recollection.

Dual-process theories of recognition memory hypothesize separate underlying familiarity and recollection processes, but the necessity of multiple processes is debated. Previous research has suggested that scalp-recorded event-related brain potentials (ERPs) may index the activity of separate familiarity and recollection processes. Other research indicates that the amnestic drug midazolam impairs recollection more than familiarity. Here, we used a convergent pharmacological and electrophysiological approach to manipulate and monitor human brain activity and provide evidence for separate processes. Midazolam selectively influenced the putative ERP-correlate of recollection but not the putative ERP-correlate of familiarity. Under control conditions (saline), subjects' accuracy correlated with the recollection-related but not the familiarity-related ERP component, suggesting that recollection was dominant in driving memory. The opposite pattern was observed under midazolam administration, suggesting that when recollection fails, subjects may leverage familiarity to compensate. Thus, in contrast to perspectives holding that familiarity represents the default process, these results suggest that recollection was dominant until its impairment unveiled the influence of familiarity.

Adult↗
PubMed1997

What underlies the deficit in reported recollective experience in old age?

In recognition memory, older adults report fewer occasions on which recognition is accompanied by recollection of the original encoding context. This study asks why this occurs. Two main hypotheses were tested: (1) Older adults fail to encode the items sufficiently when first they experience them. (2) Older adults have a retrieval deficit that prevents efficient reintegration of target and context. In addition, the hypothesis that frontal lobe integrity is essential for recollective experience was examined. Twenty older (mean age 70.7 years) and 20 younger (mean age 22.9 years) adults were asked to study a list of items and to verbalize the strategies they were using to remember. A further 20 older adults (mean age 70.0 years) were tested without the think-aloud protocol. Subsequently, subjects completed a battery of psychometric tests before completing a recognition test. As expected, older adults showed less recollective experience. They differed from the young in how they encoded the material, and once this difference was accounted for, no age differences in recollective experience remained. There was little evidence to support the hypothesis that frontal lobe integrity plays a role in the reduction of recollective experience with age.

Adult↗
PubMed1998

The role of dynamic information in the recognition of unfamiliar faces.

The effects of movement on unfamiliar face recognition were investigated. In an incidental learning task, faces were studied either as computer-animated (moving) displays or as a series of static images, with identical numbers of frames shown for each. The movements were either nonrigid transformations (changes in expression) or rigid rotations in depth (nodding or shaking). At test, participants saw either single, static images or moving sequences. Only one experiment showed a significant effect of study type, in favor of static instances. There was no additional advantage from studying faces in motion in these experiments, in which both study types showed the same amounts of information. Recognition memory was relatively unaffected by changes in expression between study and test. Effects of viewpoint change were large when expressive transformations had been studied but much smaller when rigid rotations in depth had been studied. The series of experiments did reveal a slight advantage for testing memory with moving compared with static faces, consistent with recent findings using familiar faces. Future work will need to examine whether such effects may also be due to the additional information provided by an animated sequence.

Adult↗
PubMed1991

Norwegian military field exercises in the arctic: cognitive and physical performance.

In an effort to determine whether or not field living conditions degrade performance during cold weather military training, performance of 17 Norwegian Army soldiers living in tents in the field (FG) was compared with that of 13 soldiers living in barracks (GG). FG and GG performed similar tasks and were equipped and clothed identically. Each subject was tested prior to and following 9 days of field training. The tests consisted of marksmanship (score for a 5-shot group), snowshoe running (time to cover 1700 m), anaerobic power (Wingate test), and performance on 5 cognitive tests (preferred hand tapping, 4-choice reaction time, pattern recognition, memory search, and code substitution; each test scored as % correct and # completed). A subset of the subjects from each group wore watches which recorded heart rate during the day. During training GG had a lower average heart rate than FG, indicating lower physical activity level. Significant changes were not found in rifle shooting or in mean anaerobic power. Significant group (p less than .001) and time (p less than .001; pre vs. post) differences were found in snowshoe time, but a significant interaction was not found. Among the cognitive tests, a significant group by time interaction was found for % correct responses only for the Memory Search task, and represented a decrease in GG performance while FG performance was maintained. Time differences were found for # completed for Memory Search (p less than .002) and Pattern Recognition (p less than .001) suggesting incomplete learning of the task, but no group by time interactions were found.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1985

The segregation of items into categories by ten-month-old infants.

2 experiments were conducted investigating infants' use of structural relations (i.e., correlated attribute values) in dividing or segregating items into categories. Rosch argued that attribute values do not occur in all possible combinations in the real world. Even though values of attributes may vary continuously across objects, some combinations are more likely to occur than others, forming breaks or discontinuities between clusters of correlated values. Within a well-controlled laboratory context, using artificial categories and a standard infant-recognition memory procedure, the present experiments demonstrated 10-month-old infants' sensitivity to structural information like that proposed by Rosch to exist in the real world, and their ability to segregate items into categories on the basis of clusters of correlated attribute values.

Attention↗
PubMed1997

Cognitive testing of elderly Chinese from selected community clubs in Singapore.

The aim of this study was to describe the psychometric performance of cognitively normal elderly Chinese on selected psychological tests. One hundred and fifty-five community-living, cognitively intact elderly Chinese, stratified according to age and gender were administered a selected neuropsychological assessment battery which comprised the Abbreviated Mental Test (AMT), the Chinese Mini-Mental Status (CMMS), the Short Blessed Test (SBT), the Word-List Immediate Memory (WL-i), the Word-List Delayed Memory (WL-d), the Word-List Recognition Memory (WL-r), the Set Test (ST), the modified Boston Naming Test (BNT), the Constructional Praxis Test (CPT), the Block Design Test (BDT) and the Object Assembly Test (OAT). The local median scores (ranges) of the above tests were as follows-AMT: 9 (6-10); CMMS: 25 (16-28); SBT: 2 (0-10); WL-i: 17 (8-27); WL-d: 5 (0-10); WL-r: 9 (1-10); ST: 13 (6-25); BNT: 14 (10-15); CPT: 1 (0-3); BDT: 19 (0-42); OAT: 20 (3-33). These results can assist in the clinical identification of cognitive abnormalities amongst the elderly Chinese in Singapore. Future work will attempt to adjust these overall scores for variables such as the subjects' education and age.

Aged↗
PubMed2004

fMRI correlates of the episodic retrieval of emotional contexts.

Functional neuroimaging studies reveal differences in neural correlates of the retrieval of emotional and nonemotional memories. In the present experiment, encoding of emotionally neutral pictures in association with positively, neutrally or negatively valenced background contexts led to differential modulation of neural activity elicited in a subsequent recognition memory test for these pictures. Recognition of stimuli previously studied in emotional compared to neutral contexts elicited enhanced activity in structures previously implicated in episodic memory, including the parahippocampal cortex, hippocampus and prefrontal cortex. In addition, there was engagement of structures linked more specifically to emotional processing, including the amygdala, orbitofrontal cortex and anterior cingulate cortex. These emotion-related effects displayed both valence-independent and valence-specific components. We discuss the findings in terms of current models of emotional memory retrieval.

Adolescent↗
PubMed2000

Surface form typicality and asymmetric transfer in episodic memory for spoken words.

A series of experiments was conducted to determine whether the typicality of the surface form of speech would affect memory retention of spoken words. For each surface characteristic studied, a continuous-recognition-memory task was used in which listeners based recognition judgments on word identity alone. For "typical" items, repetition benefits did not depend on whether the surface forms of the 1st and 2nd occurrences matched or mismatched. For "atypical" items, a larger repetition benefit occurred when the surface forms of the 2 occurrences matched. These results suggest that episodic memory for spoken words may be directly related to the perceived typicality of particular surface characteristics.

Adult↗
PubMed1999

Motoric encoding and retention of pictures in Alzheimer's disease.

20 patients with Alzheimer's disease were shown line drawings of common objects on two trials. During the second trial they were asked to pantomime an action for the object and then provided a standard motoric cue or were asked to name it and then provided a standard semantic cue. Semantic cueing served as a stimulus-processing control condition. Memory for pictures was assessed at a 48-hr. delay interval using a yes-no recognition-memory procedure. Discrimination of stimulus pictures from distractors at 48 hours was similar for the motoric and control (semantic) encoding condition. These findings suggest that motoric encoding does not enhance long-term retention of episodic memories for pictures in such patients.

Aged↗