Direct and indirect measures of memory for modality in young and older adults.

In 2 experiments, young and older adults demonstrated modality effects of similar magnitude in perceptual identification tasks. That is, both young and older adults demonstrated more repetition priming when study and test modalities matched than when they were different, suggesting that contextual information was equally available across age. However, when asked explicitly to retrieve modality information, older adults were less accurate than young adults. These results constitute evidence for a dissociation between direct and indirect measures of memory for modality information. They call into question hypotheses that memory impairment in old age is due to deficient encoding of contextual information and challenge current accounts of modality effects in repetition priming. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Direct and indirect tests of memory for category exemplars in young and older adults.

Young and older adults were compared on direct (cued recall) and indirect (exemplar generation) tests of memory for category members. Because category names served as cues in both tasks, amount of retrieval support was constant across tasks. Although older adults produced fewer category members in cued recall, priming of category exemplars in the generation task did not vary with age. These results suggest that age constancy in priming tasks does not depend on physical similarity between study materials and retrieval cues provided at test and point to the importance of deliberate recollection as a factor in determining the extent of age differences in memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Direct versus indirect bioleaching

The dissolution of metal sulfides is controlled by their solubility product and thus, the [H⁺] concentration of the solution, and further enhanced by several chemical mechanisms which lead to a disruption of sulfide chemical bonds. They include extraction of electrons and bond breaking by [Fe³⁺], extraction of sulfur by polysulfide and iron complexes forming reactants [Y⁺] and electrochemical dissolution by polarization of the sulfide [high Fe³⁺ concentration]. All these mechanisms have been exploited by sulfide and iron-oxidizing bacteria. Basically, the bacterial action is a catalytic one during which [H⁺], [Fe³⁺] and [Y⁺] are breaking chemical bonds and are recycled by the bacterial metabolism. While the cyclic bacterial oxidative action via [H⁺] and [Fe³⁺] can be called indirect, bacteria had difficulties harvesting chemical energy from an abundant sulfide such as FeS₂, the electron exchange properties of which are governed by coordination chemical mechanisms (extraction of electrons does not lead to a disruption of chemical bonds but to an increase of the oxidation state of interfacial iron). Here, bacteria have evolved alternative strategies which require an extracellular polymeric layer for appropriately conditioned contact with the sulfide. Thiobacillus ferrooxidans cycles [Y⁺] across such a layer to disrupt FeS₂ and Leptospirillum ferrooxidans accumulates [Fe³⁺] in it to depolarize FeS₂ to a potential where electrochemical oxidation to sulfate occurs. Corrosion pits and high resolution electron microscopy leave no doubt that these mechanisms are strictly localized and depend on specific conditions which bacteria create. Nevertheless, they cannot be called ‘direct’ because the definition would require an enzymatic interaction between the bacterial membrane and the cell. Therefore, the term ‘contact’ leaching is proposed for this situation. In practice, multiple patterns of bacterial leaching coexist, including indirect leaching, contact leaching and a recently discovered cooperative (symbiotic) leaching where ‘contact’ leaching bacteria are feeding so wastefully that soluble and particulate sulfide species are supplied to bacteria in the surrounding electrolyte.     

Aging and interference: Evidence from indirect memory tests.

Four experiments examined age differences on indirect memory tests as a function of (a) the status of a stimulus as target or distractor and (b) the degree of predictability of a stimulus from context. No differences between young and old adults were found when targets were clearly designated as such. In this situation, participants showed priming for unexpected but not expected stimuli whether these words appeared as targets or distractors. In contrast, age differences emerged when there was initial uncertainty on each trial as to which stimulus was the target. It is concluded that aging is associated with a decrease in the efficiency of mechanisms involved in selection. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Direct versus indirect personality assessment: Evidence and implications.

Discusses and evaluates results from a study comparing the validity of direct vs. indirect personality measures by W. Scott and R. Johnson (See PA, Vol. 48:Issue 6) in the context of previous relevant research. General findings support the utility of direct compared to indirect approaches to personality measurement. Some of the main limitations and implications of the findings are analyzed. (21 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Direct comparison of four implicit memory tests.

Four verbal implicit memory tests, word identification, word stem completion, word fragment completion, and anagram solution, were directly compared in 1 experiment and were contrasted with free recall. On all implicit tests, priming was greatest from prior visual presentation of words, less (but significant) from auditory presentation, and least from pictorial presentations. Typefont did not affect priming. In free recall, pictures were recalled better than words. The 4 implicit tests all largely index perceptual (lexical) operations in recognizing words, or visual word form representations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Age differences in learning serial patterns: Direct versus indirect measures.

Adult age differences in learning and retention of a nonverbal sequence were examined using the serial reaction-time (RT) task of M. J. Nissen and P. Bullemer (see record 1987-13436-001), with 20 younger and 20 older Ss. An asterisk appeared in one of 4 spatial locations, and the Ss responded with a corresponding key press. The first 4 blocks each contained 10 repetitions of a 10- or 16-element spatial sequence, and the 5th block contained a random sequence. The difference between response time on Blocks 5 and 4 served as an indirect measure of pattern learning. The direct measure was accuracy in a final generation block in which the Ss predicted which location would appear next. Results were similar to those with verbal materials; the indirect measure revealed age similarity for patterns of both lengths, but the direct measure yielded age differences favoring the young. For both ages and types of measures, the long patterns led to poorer learning than did the short patterns. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Presentation modality and indirect performance information: Effects on ratings, reactions, and memory.

The authors investigated whether raters integrate indirect (second-hand) information from an employee's co-worker with their direct observations when completing performance evaluations. Performance levels of direct and indirect information and presentation modality (auditory vs. textual) were manipulated (N=220). Results showed that indirect information was perceived to be of highest utility when the performance levels of the direct and indirect information were consistent. Confidence in performance ratings was lowest when the indirect source delivered negative performance feedback that was contrary to the rater's own positive observations. Indirect information was only reflected in the performance ratings when direct observations were positive. There was a significant 3-way interaction between performance level of the direct information, performance level of the indirect information, and presentation modality on memory for performance incidents. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Directed forgetting affects both direct and indirect tests of memory.

In two experiments, subjects were instructed either to remember or to forget each word. Following study, two tests were given, one a direct test of memory requiring conscious recollection of the study list and the other an indirect test that could be performed without awareness of the study list. In Experiment 1, subjects recognized more remember than forget words (direct test) and completed more remember than forget fragments (indirect test) on both immediate and 1-week delayed tests. In Experiment 2, subjects showed superior recall (direct test) and greater repetition priming in lexical decision (indirect test) for remember than for forget words. The consistent directed forgetting effect on both types of tests is in accord with the idea that forget items are inhibited at the time of retrieval and that retrieval manipulations, unlike elaboration manipulations at encoding, affect direct and indirect tests in similar ways. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Aging and memory for frequency of occurrence of novel, visual stimuli: Direct and indirect measures.

Memory for frequency of occurrence typically is investigated using familiar stimuli (e.g., words) and with "direct" tests of memory; that is, the S is required to state explicitly how often an item occurred or which item occurred more often. Exps 1 and 2 examined the effects of age on the ability to make judgments (i.e., direct tests) regarding the frequency of occurrence of words and of novel, visual stimuli (Japanese ideograms). In Exp 3, young and old Ss were compared on "indirect" measures of memory for frequency of occurrence of these ideograms, as indexed by the mere exposure effect. On the direct test of memory, elderly and young Ss did not differ when shown words, but elderly were impaired compared with young Ss when ideograms were presented. When tested indirectly, both groups were sensitive to the frequency of occurrence of ideograms. The pattern of results replicates and extends previous findings regarding performance dissociations between direct and indirect measures of memory in aging. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

The use of indirect memory tests to assess malingered amnesia: A study of metamemory.

Many techniques have been suggested for identifying criminal suspects who are simulating amnesia for events surrounding a crime. The present research focuses on indirect memory tests as a potential means of discriminating between those who genuinely suffer from amnesia and those who are simulating. Ss studied a list of words and subsequently performed either a word completion or a fragment completion task. Under normal indirect test instructions, typical priming effects were observed. When Ss were motivated to simulate amnesia for the list, target completion rates were consistently, and sometimes reliably, below baseline completion rates. This finding is contrary to the performance of genuine amnesics, whose performance on indirect tests typically mirrors that of normal Ss. Indirect tests may prove useful in discriminating genuine and simulating amnesics. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of aging on memory for presentation modality.

Two experiments were conducted to examine evidence for the automatic processing of information about presentation modality in older adults. Young (mean age?=?22 years) and older adults (mean age?=?69 years) were asked to learn a mixed-modality (auditory and visual) list of nouns, then to recall the target words, and finally to identify the presentation modality of each word on a recognition list. Half of the participants in each study were told in advance to also remember modality information. The experiments differed in the number of judgments that had to be made about each word in the recognition list. Two of Hasher and Zacks' (1979) criteria for automatic processing (no effect of intentionality and minimal interference with other processes occurring at the same time) were satisfied. The minimal developmental change criterion, however, was not. Although the performance of both age groups was above chance, some decrement in modality memory occurred in the older adults. The results both support the notion of an automatic encoding process for modality information and raise questions about the adequacy of the age-invariance criterion. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Neuroimaging evidence for agenda-dependent monitoring of different features during short-term source memory tests.

A short-term source monitoring procedure with functional magnetic resonance imaging assessed neural activity when participants made judgments about the format of 1 of 4 studied items (picture, word), the encoding task performed (cost, place), or whether an item was old or new. The results support findings from long-term memory studies showing that left anterior ventrolateral prefrontal cortex (PFC) is engaged when people make source attributions about reflectively generated information (cognitive operations, conceptual features). The findings also point to a role for right lateral PFC in attention to perceptual features and/or familiarity in making source decisions. Activity in posterior regions also differed depending on what was evaluated. These results provide neuroimaging evidence for theoretical approaches emphasizing that agendas influence which features are monitored during remembering (e.g., M. K. Johnson, S. Hashtroudi, & D. S. Lindsay, 1993). They also support the hypothesis that some of the activity in left lateral PFC and posterior regions associated with remembering specific information is not unique to long-term memory but rather is associated with agenda-driven source monitoring processes common to working memory and long-term memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Direct versus indirect suggestions, archaic involvement, and hypnotic experience.

This study examined the effects of direct (Harvard Group Scale of Hypnotic Susceptibility: [{hgshs}:{a}]; Shor & Orne, 1962) versus indirect (Alman-Wexler Indirect Hypnotic Susceptibility Scale [{awihss}]; Pratt, Wood, & Alman, 1984) suggestions on arcahaic involvement (Nash & Spinler, in press) with the hypnotists, objective responding, and subjective involvement and involuntariness ratings, when the scales were administered in all possible combinations (direct/indirect, N?=?61; indirect/direct, N?=?61; direct/direct, N?=?57; indirect/indirect, N?=?95), across two sessions. At the initial testing, subjects who received indirect suggestions reported a greater emotional bond with the hypnotist and increased fear of negative appraisal than subjects who received direct suggestions. Repeated testing resulted in response decrements on measures of objective responding, subjective involvement, and involuntariness that were paralled by diminished involvement with the hypnotist. The most stable relation between scales was evident when scales were defined as direct hypnosis across both sessions. Although direct and indirect suggestions produced comparable effects in the first session, in the second session, direct suggestions fostered greater subjective involvement and feelings of involuntariness. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Direct comparison of two implicit memory tests: Word fragment and word stem completion.

In 3 experiments, the implicit memory tests of word fragment and word stem completion showed comparable effects over several variables: Study of words produced more priming than did study of pictures; no levels-of-processing effect occurred for words; more priming was obtained from pictures when Ss imaged the pictures' names than when they rated them for pleasantness; and forgetting rates were generally similar for the tests. A different pattern of results for the first 3 variables occurred under explicit test conditions with the same word fragments or word stems as cues. It is concluded that the 2 implicit tests are measuring a similar form of perceptual memory. Furthermore, it is argued that both tests are truly implicit because they meet the D. L. Schacter et al (1989) retrieval intentionality criterion: Levels of processing of words have a powerful effect on explicit versions of the tests but no effect on implicit versions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Indirect influence on modality on direct memory for words and their modality: Closed-head-injured and control participants.

Twenty closed-head-injured (CHI) patients and 28 control participants were tested on recall and recognition of words. In addition, memory for modality (i.e., visual vs. auditory) of word presentation was measured directly (i.e., recognition) and indirectly (i.e., by its influence on word and modality recognition). As predicted, the CHI patients were impaired relative to controls on all of the direct memory tasks; that is, word recall, word recognition, and modality judgment. However, the CHI and control groups did not differ significantly on the magnitude of the modality effect (i.e., facilitation due to correspondence of modality in learning and test). The findings are interpreted in the theoretical framework that distinguishes between item (i.e., words) and source (i.e., modality) memory and between direct and indirect measures of memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Judgments of frequency and recognition memory in a multiple-trace memory model.

The multiple-trace simulation model, {minerva} 2, was applied to a number of phenomena found in experiments on relative and absolute judgments of frequency, and forced-choice and yes–no recognition memory. How the basic model deals with effects of repetition, forgetting, list length, orientation task, selective retrieval, and similarity and how a slightly modified version accounts for effects of contextual variability on frequency judgments were shown. Two new experiments on similarity and recognition memory were presented, together with appropriate simulations; attempts to modify the model to deal with additional phenomena were also described. Questions related to the representation of frequency are addressed, and the model is evaluated and compared with related models of frequency judgments and recognition memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A spatial modality effect in serial memory.

In 2 experiments, the authors tested whether the classical modality effect--that is, the stronger recency effect for auditory items relative to visual items--can be extended to the spatial domain. An order reconstruction task was undertaken with four types of material: visual-spatial, auditory-spatial, visual-verbal, and auditory-verbal. Similar serial position curves were obtained regardless of the nature of the to-be-remembered sequences, with the exception that a modality effect was found with spatial as well as with verbal materials. The results are discussed with regard to a number of models of short-term memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of intentional versus incidental learning on explicit and implicit tests of memory.

In Experiment 1, subjects monitored and responded to the termination of words displayed for 1, 3, or 6.5 sec. Anticipation of an unspecified memory test facilitated subsequent recognition memory, but not priming of word-fragment completion. In Experiment 2, subjects repeated the words aloud for the duration of each word's exposure. Recognition memory was facilitated by anticipation of either a recognition memory test or a fragment-completion test on the studied words, as well as by lengthened rehearsal duration. Priming of fragment-completion was facilitated only by anticipation of a fragment-completion test on the studied words. The results indicate that subjects can adopt encoding strategies which enhance performance on implicit memory tests. A transfer-appropriate processing account applies most parsimoniously to the data. (PsycINFO Database Record (c) 2010 APA, all rights reserved)