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PubMed2002

Cognitive impairment in methadone maintenance patients.

Few well-controlled studies have examined psychomotor and cognitive performance in methadone maintenance patients (MMP). In the present study, performance of 18 opioid-dependent MMP was evaluated relative to that of 21 control participants without substance abuse histories. The MMP and control groups were balanced with respect to gender, race, age, years of education, current employment status, current reading level, and estimated IQ score. Recent drug abstinence was verified by urine testing. Participants with a urine screen positive for benzodiazepines or a breathalyzer test positive for alcohol prior to performance testing were excluded. To avoid testing under conditions of acute heroin or cocaine intoxication, but without testing under conditions of acute withdrawal, participants with current use of heroin or cocaine were only required to abstain for 24 h prior to performance testing. MMP exhibited impairment relative to controls in psychomotor speed (digit symbol substitution and trail-making tests), working memory (two-back task), decision making (gambling task), and metamemory (confidence ratings on a recognition memory test); results also suggested possible impairment in inhibitory mechanisms (Stroop color-word paradigm). MMP did not exhibit impairment in time estimation, conceptual flexibility or long-term memory. The wide range of impaired functions is striking, and may have important implications for daily functioning in MMP. Further research is necessary to determine the clinical significance of the impairments in laboratory-based tests for daily performance in the natural environment, as well as to differentiate impairments due to acute methadone dosing, chronic methadone maintenance, chronic poly-drug abuse, and other factors.

Adult↗
PubMed1991

Evidence for complete translational and reflectional invariance in visual object priming.

The magnitude of priming on naming reaction times and on the error rates, resulting from the perception of a briefly presented picture of an object approximately 7 min before the primed object, was found to be independent of whether the primed object was originally viewed in the same hemifield, left-right or upper-lower, or in the same left-right orientation. Performance for same-name, different-examplar images was worse than for identical images, indicating that not only was there priming from block one to block two, but that some of the priming was visual, rather than purely verbal or conceptual. These results provide evidence for complete translational and reflectional invariance in the representation of objects for purposes of visual recognition. Explicit recognition memory for position and orientation was above chance, suggesting that the representation of objects for recognition is independent of the representations of the location and left-right orientation of objects in space.

Adult↗
PubMed2006

A typical feeding enhances memory for spoken words in healthy 2- to 3-day-old newborns.

OBJECTIVE: The objective of this study was to determine whether healthy 2- to 3-day-old newborns have better memory of a spoken word after a typical feeding (breast milk or formula) than before a feeding and, if so, whether memory is related to blood glucose. METHODS: A naturalistic study was conducted in which delayed recognition memory of a spoken word was examined in 60 healthy 2- to 3-day-old newborns either 120 minutes after their previous feeding (preprandial) or 30 minutes after their last feeding (postprandial). In this procedure, infants initially turn their head toward a novel word (orientation) and with repeated presentations cease turning toward it (habituation). Mean number of trials to reach orientation and habituation criteria provides measures of attention and rate of learning, respectively. After a 100-second delay, the word is presented again. Infants either turn toward it, indicating that they have forgotten it, or remain habituated, indicating that they remembered the word. Percentage of trials with head turns toward the word after the delay is the principal dependent measure. RESULTS: The postprandial group was split at the median for blood glucose to define high- and low-glucose groups. All 3 groups showed similar rates of orientation and habituation. On reexposure to the word during postdelay trials, the preprandial group displayed less retention than the postprandial high and low groups. No correlation was found between memory and blood glucose levels. The postprandial high blood glucose level differed statistically from the preprandial level, whereas the postprandial low level did not. CONCLUSIONS: Memory for spoken words in newborns is better after a typical milk feeding than before a feeding. This feeding effect is specific to memory and does not include attention or rate of learning. Also, it is not necessarily associated with increased blood glucose. It remains to be seen whether feeding enhances memory for other types of stimuli and what implications this may have for development.

Attention↗
PubMed1992

False recognition and perception without awareness.

Jacoby and Whitehouse (1989) demonstrated that the probability of calling new test words "old" (i.e., false recognition) is biased by context words. When context words were briefly exposed and subjects were not informed of their presence, new words were called "old" more often if the context and test words were identical than if the context and test words were different. When the context words were presented at longer exposure durations and subjects were informed of their presence, the opposite pattern of results occurred. In Experiment 1, we replicated the critical qualitative difference across conditions reported by Jacoby and Whitehouse. In addition, the combined results of Experiments 2 and 3 demonstrated that the exposure duration of the context words, and not the instructions to the subjects, is the primary factor determining which pattern of false recognition occurs. However, in contrast with the findings of Jacoby and Whitehouse, both patterns of false recognition were associated with significant recognition memory for the context words. The latter finding presents problems for any interpretation of false recognition, which implies that the briefly exposed context words are perceived without awareness.

Adult↗
PubMed1992

Cholinergic cell loss and hypertrophy in the medial septal nucleus of the behaviorally characterized aged rhesus monkey.

Quantitative studies were conducted to determine the number and size of cholinergic neurons in the medial septal nucleus of four aged (23-25 years old) and four young (10-12 years old) rhesus monkeys. All of the animals had been tested on an extensive battery of learning and memory tasks prior to these experiments. Two of the aged monkeys displayed a pattern of recognition memory deficits that resembled the effects of medial temporal lobe damage. The postmortem anatomical data were analyzed in relation to both the age and behavioral status of the animals. Across all rostrocaudal levels of the medial septal nucleus, there was a 19.3% decrease in the number of cholinergic neurons in the aged monkeys. The loss was regionally selective, however, and ranged from a low of 6.2% rostrally to 40.9% caudally. The degree of cell loss was similar in both memory-impaired and memory-unimpaired aged animals. Morphological analysis also revealed that the mean cross-sectional area of cholinergic neurons was significantly larger in the aged animals. At caudal levels, the increase in average cell size was at least partly due to a disproportionate loss of small to medium size neurons. At rostral levels of the medial septal nucleus, however, where there was minimal cell loss, a clear hypertrophy of cholinergic neurons was evident. Interestingly, the cell hypertrophy observed at these rostral levels was present only in brains from the behaviorally impaired aged monkeys. These findings represent the first morphological demonstration of alterations in cholinergic neurons in the aged nonhuman primate.(ABSTRACT TRUNCATED AT 250 WORDS)

Aging↗
PubMed2003

Quantitative measures of memory malingering on the Wechsler Memory Scale--Third edition in mild head injury litigants.

Wechsler Memory Scale-Third edition (WMS-III) performance in 25 mild traumatic brain injury (TBI) litigants who met the criteria for probable malingered neurocognitive dysfunction (MND) was compared with 50 nonmalingering subjects. The base rate for probable MND in the population studied was 27%. Overall, malingerers showed globally depressed memory function. They returned significantly poorer scores than nonmalingerers on all WMS-III indexes and subtests, and on selected WMS-III index difference scores and intelligence-memory difference scores. Using the minimum score returned in the nonmalingerers as the cut-off for malingering, the delayed auditory recognition memory tasks were highly effective in detecting malingering. Raw scores below 43 on the auditory recognition-delayed (AR-D) subtest or below 18 on word list II-recognition, identified around 80% of the malingerers. In a group of 50 severe TBI litigants, only a very small proportion (i.e., <10%) returned scores below the cut-offs for malingering for the mild TBI subjects.

Adolescent↗
PubMed2000

An event-related potential study of encoding in young and older adults.

Event-related brain potentials (ERPs) were recorded from young (M age=25) and older (M age=71) adults during the study phase of a recognition memory paradigm. Participants studied two temporally distinct lists of sentences (each containing two unassociated nouns). During recognition testing, in response to the nouns, participants made old/new, followed by remember (context)/know (familiarity) and temporal source (i.e., list) judgments. To assess age-related differences in encoding, the ERPs recorded during study were averaged as a function of the correctness of the judgment of old in conjunction with subsequent temporal (list correct/incorrect) and subsequent remember and know judgments, i.e., subsequent memory or Dm effects were computed. Both young and old showed robust Dm activity regardless of whether the subsequent temporal source judgment was correct or incorrect. Although both young and old produced robust Dm effects for study items subsequently associated with a remember judgment, only the older participants showed a reliable Dm effect associated with study trials that were subsequently associated with a know judgment. This pattern of results suggests that older adults did not differentially encode items that would be subsequently retrieved with context from those that would be retrieved without such attributes.

Adult↗
PubMed1983

Memory for topics of conversation: adult age differences and intentionality.

Young adults and elderly adults received a series of topics for discussion, followed by a recall test of the topics per se and a recognition memory test of the questions asked during the conversations. Half of the participants in each age group were forewarned of the subsequent recall test (intentional memory); the remaining participants were not forewarned (incidental memory). Null effects for instructional variation were found at both age levels for all memory scores. For recall, an age difference, favoring young adults, was found. However, no age difference was found for either the recognition of old questions as old or the recognition of new questions as new. The results were interpreted in terms of an age deficit for the retrieval of memory traces established by the comprehension of conversational content.

Adolescent↗
PubMed2002

Temporal order memory in patients with Korsakoff's syndrome and medial temporal amnesia.

Two groups of patients with global amnesia resulting either from Korsakoff's syndrome (KS) or from medial temporal lobe (MTL) damage were compared with groups of matched healthy control subjects on a list discrimination paradigm. Item recognition memory was matched across the amnesic and control groups in order to determine whether KS, but not MTL amnesics are disproportionately impaired on list discrimination as predicted by Parkin's [Functional significance of etiological factors in human amnesia. In: Squire LR, Butters N, editors. Neuropsychology of memory, 2nd ed. New York: The Guilford Press, 1992] hypothesis. However, both patient groups were impaired disproportionately on the temporal order memory task, which is inconsistent with Parkin's hypothesis. It remains possible that the KS patients are more disproportionately impaired than those with MTL damage because both patient groups performed at floor on the list discrimination task. The results are consistent with theories that postulate a critical role for the hippocampus in the kind of associative memory which underlies memory for temporal order, but not in recognition of single items or arbitrary associations between items of similar kinds.

Adolescent↗
PubMed2005

Induced theta oscillations mediate large-scale synchrony with mediotemporal areas during recollection in humans.

One functional aspect of theta oscillations that recent studies have begun to explore in humans is their role for the recollection of personal events. A specific role of theta for recollection but not for stimulus-familiarity would support links between cortical theta oscillations and hippocampal functioning, given that the hippocampus seems to be more critical for recollection than for stimulus-familiarity. During recollection, theta oscillations might mediate a dynamic link between hippocampal and neocortical areas, thereby allowing to recruit and bind distributed cortical representations. We recorded theta oscillations using whole-head magnetoencephalography while nine healthy subjects made recognition memory judgments on previously studied and unstudied pictures of faces. For each recognized face, subjects indicated whether they also recollected the background image in front of which that face was studied. Theta oscillations were higher in amplitude during recollection than during recognition in the absence of accurate memory for the background. These theta oscillations were induced in nature, meaning that they showed considerable phase variability from trial to trial. To nevertheless extract the field distribution of coherent theta oscillations from single trials, we calculated phase differences between sensor pairs at each time point of each single trial. This field information was used to localize the brain sources of synchronized theta-generators. The results suggest that recollection is associated with induced activity increase in a distributed synchronous theta network, including prefrontal, mediotemporal, and visual areas. These findings are compatible with the notion that theta oscillations are related to the binding of distributed cortical representations during recollection.

Biological Clocks↗
PubMed2003

Memory assessment during the intracarotid amobarbital procedure: influence of injection order.

OBJECTIVE: To analyze, in patients with unilateral regional epilepsy, the influence of intracarotid amobarbital injection order on the level of recognition memory, with both injections performed within approximately half an hour, when the order was varied by a first injection into either the epileptogenic or the nonepileptogenic hemisphere. METHODS: Of a series of 74 consecutive intracarotid amobarbital procedures (IAP), 61 valid bilateral tests were extracted for analysis. The protocol was changed from a congruent sequence (epileptogenic hemisphere injected first; n = 32) to an incongruent sequence (nonepileptogenic hemisphere injected first; n = 29). Memory was quantified by the percentage of presented items recognized before the recovery of full motor power (corrected for guessing). RESULTS: The congruent group showed a poorer recognition percentage after injection into the nonepileptogenic hemisphere than after injection into the epileptogenic hemisphere. The incongruent group had a similar recognition percentage after both injections. This was especially apparent in patients with a right epileptogenic hemisphere. CONCLUSIONS: The commonly used congruent injection order leads to a poorer recognition by the epileptogenic hemisphere than the nonepileptogenic hemisphere. This relation cannot be found with an incongruent sequence. The results raise doubts about the internal validity of the IAP in describing isolated hemispheric memory functions.

Adult↗
PubMed2003

The relationship between change detection and recognition of centrally attended objects in motion pictures.

Observers typically detect changes to central objects more readily than changes to marginal objects, but they sometimes miss changes to central, attended objects as well. However, even if observers do not report such changes, they may be able to recognize the changed object. In three experiments we explored change detection and recognition memory for several types of changes to central objects in motion pictures. Observers who failed to detect a change still performed at above chance levels on a recognition task in almost all conditions. In addition, observers who detected the change were no more accurate in their recognition than those who did not detect the change. Despite large differences in the detectability of changes across conditions, those observers who missed the change did not vary in their ability to recognize the changing object.

Attention↗
PubMed1999

Isolating the contributions of familiarity and source information to item recognition: a time course analysis.

Recognition memory may be mediated by the retrieval of distinct types of information, notably, a general assessment of familiarity and the recovery of specific source information. A response-signal speed-accuracy trade-off variant of an exclusion procedure was used to isolate the retrieval time course for familiarity and source information. In 2 experiments, participants studied spoken and read lists (with various numbers of presentations) and then performed an exclusion task, judging an item as old only if it was in the heard list. Dual-process fits of the time course data indicated that familiarity information typically is retrieved before source information. The implications that these data have for models of recognition, including dual-process and global memory models, are discussed.

Adult↗
PubMed1998

Experiences of remembering, knowing, and guessing.

This article presents and discusses transcripts of some 270 explanations subjects provided subsequently for recognition memory decisions that had been associated with remember, know, or guess responses at the time the recognition decisions were made. Only transcripts for remember responses included reports of recollective experiences, which seemed mostly to reflect either effortful elaborative encoding or involuntary reminding at study, especially in relation to the self. Transcripts for know responses included claims of just knowing, and of feelings of familiarity. These transcripts indicated that subjects were often quite confident of the accuracy of their decisions, compared with those for guess responses. Transcripts for decisions associated with guess responses also expressed feelings of familiarity but additionally revealed various strategies and inferences that did not directly reflect memory for studied items. The article concludes with a historical and theoretical overview of some interpretations of the states of awareness measured by these responses.

Association Learning↗
PubMed1986

Memory impairments caused by experimental thalamic lesions in monkeys.

A series of experiments examined the effects of selective diencephalic lesions upon object recognition in the cynomolgus monkey (Macaca fascicularis). In the first experiment it was found that extensive lesions of the medial thalamus (MT) produced a severe deficit in both relearning the recognition task and subsequently performing with retention intervals longer than 10 sec. Additional experiments showed that more selective lesions in either the anterior medial thalamus (AMT), the posterior medial thalamus (PMT), or the medial mamillary nucleus (MB) only produced mild recognition memory impairments. It is argued that a combination of damage is required to produce the severe memory impairments observed in cases of global diencephalic amnesia.

Alcohol Amnestic Disorder↗
PubMed2006

Declarative memory consolidation in humans: a prospective functional magnetic resonance imaging study.

Retrieval of recently acquired declarative memories depends on the hippocampus, but with time, retrieval is increasingly sustainable by neocortical representations alone. This process has been conceptualized as system-level consolidation. Using functional magnetic resonance imaging, we assessed over the course of three months how consolidation affects the neural correlates of memory retrieval. The duration of slow-wave sleep during a nap/rest period after the initial study session and before the first scan session on day 1 correlated positively with recognition memory performance for items studied before the nap and negatively with hippocampal activity associated with correct confident recognition. Over the course of the entire study, hippocampal activity for correct confident recognition continued to decrease, whereas activity in a ventral medial prefrontal region increased. These findings, together with data obtained in rodents, may prompt a revision of classical consolidation theory, incorporating a transfer of putative linking nodes from hippocampal to prelimbic prefrontal areas.

Adult↗
PubMed1986

Preference, familiarity, and recognition after repeated brief exposures to random geometric shapes.

Repeated one-millisecond exposures to random polygon targets have been shown to result in preference for the target shapes over similar distractor shapes in the absence of recognition (Knust-Wilson & Zajonc, 1980). Seamon, Brody, and Kauff (1983a) interpreted this preference-without-recognition effect in terms of a two-process model of recognition memory. The present set of experiments tested three predictions of the two-process model: Target discrimination equal to that found in the preference task should also occur when subjects make familiarity judgments; recognition performance should improve if the target stimuli are presented and tested with an easily encodable visual context; and both preference and familiarity judgments should be unaffected by manipulations of context. The results supported all three predictions. The implications of the results for a competing model proposed by Zajonc (1980) are also discussed.

Adult↗
PubMed1987

Cued recall in depression.

An experiment is reported in which a depressed and a control group were tested on free recall, cued recall and recognition memory for a prose passage. As expected from previous work the depressives tended to show less impairment on recognition than on free recall. However, contrary to what some theories would predict, cued recall performance was no better than free recall. The implications of this finding for the nature of the depressive memory deficit for neutral materials are discussed. It seems that neither the amount of verbal output required, nor the need to generate retrieval cues, are critical factors.

Cues↗