The effect of irrelevant visual input on working memory for sign language

We report results showing that working memory for American Sign Language (ASL) is sensitive to irrelevant signed input (and other structured visual input) in a manner similar to the effects of irrelevant auditory input on working memory for speech. Deaf signers were disrupted on serial recall of lists of ASL signs when either pseudosigns or moving shapes were presented during a retention interval. Hearing subjects asked to recall lists of printed English words did not show disruption under the same interference conditions. The results favor models that hypothesize modality-specific representations of language within working memory, as opposed to amodal representations. The results further indicate that working memory for sign language involves visual or quasi-visual representations, suggesting parallels to visuospatial working memory.     

Individual differences in working memory, nonverbal IQ, and mathematics achievement and brain mechanisms associated with symbolic and nonsymbolic number processing

Individual differences in mathematics performance may stem from domain-general factors like working memory and intelligence. Parietal and frontal brain areas have been implicated in number processing, but the influence of such cognitive factors on brain activity during mathematics processing is not known. The relationship between brain mechanisms during symbolic and nonsymbolic number comparison and individual differences in working memory, nonverbal IQ, and mathematics achievement were investigated to determine possible associations with behavior and brain function. A number of brain areas showed correlations with working memory and number processing. For symbolic digits, working memory showed a positive relationship with brain activity in a network of bilateral parietal, temporal, and right frontal regions. For nonsymbolic dot arrays, working memory showed a negative relationship with several parietal and frontal brain areas. This relationship indicates differences between behavioral and brain function measures and points to the importance of working memory and basic number processing.     

Alpha spectral power and coherence in the patients with mild cognitive impairment during a three-level working memory task

Objective: The functional relationship between calculated alpha band spectral power and inter-/intra-hemispheric coherence during a three-level working memory task of patients with mild cognitive impairment (MCI) was investigated. Methods: Subjects included 35 MCI patients according to the DSM-IV criteria (mean age: 62.3, SD: 6.5) and 34 healthy controls (mean age: 57.4, SD: 4.0) were selected from the community at large. All subjects performed a simple calculation and recall task with three levels of working memory load while electroencephalograph (EEG) signal was recorded. The spectral EEG power was computed over alpha1 (8.0～10.0 Hz) and alpha2 (10.5～13.0 Hz) frequency bands and was compared between rest stage and working memory processing stage by two-way ANOVA. Post hoc testing analyzed the differences between each two levels of working memory load during task processing. The inter-hemisphere EEG coherence of frontal (F3-F4), central (C3-C4), parietal (P3-P4), temporal (T5-T6) as well as occipital (O1-O2) was compared between MCI patients and normal controls. The EEG signals from F3-C3, F4-C4, C3-P3, C4-P4, P3-O1, P4-O2, T5-C3, T6-C4, T5-P3 and T6-P4 electrode pairs resulted from the intra-hemispheric action for alpha1 and alpha2 frequency bands. Result: There was significantly higher EEG power from MCI patients than from normal controls both at rest and during working memory processing. Significant differences existed between rest condition and three-level working memory tasks (P<0.001). The inter-and intra-hemispheric coherence during working memory tasks showed a "drop to rise" tendency compared to that at rest condition. There was significantly higher coherence in MCI patients than in the controls. When task difficulties increased, the cortical connectivity of intra-hemispheric diminished while the inter-hemispheric connectivity dominantly maintained the cognitive processing in MCI patients. Conclusion: The results of the present study indicate that the alpha frequency band may be the characteristic band in distinguishing MCI patients from normal controls during working memory tasks. MCI patients exhibit greater inter-hemispheric connectivity than intra-hemispheric connectivity when memory demands increase. MCI patients mobilize a compensatory mechanism to maintain the processing effectiveness while the processing efficiency is reduced.     

基于认知神经科学视角的多媒体学习认知理论创新

Mayer多媒体学习的认知理论模型涉及感觉记忆、工作记忆、长时记忆三大基本部件和五大认知加工过程,但其科学基础仍有待深入考察。认知神经科学对感觉记忆、工作记忆和长时记忆的探索成果为多媒体学习认知理论奠定了更为深层的科学基础。认知神经科学认为,感觉记忆中的视觉记忆和声觉记忆在信息存储量、表征与编码、保持时间等方面存在互补,为多媒体学习认知理论中＂双重通道假设＂提供了更深层次的科学基础。工作记忆是多媒体学习认知加工过程的主要处理单元,认知神经科学基于脑成像技术提出的工作记忆加工成分结构及其功能定位模型和语音短时记忆功能模型,揭示了工作记忆中的信息处理机制,进一步推进了对工作记忆的基础研究。认知神经科学将长时记忆分为陈述性记忆和程序性记忆,长时记忆中信息存储的层次网络模型、激活扩散模型、集理论模型等更深入地推进了多媒体学习认知加工过程的科学基础。德国心理学家Schnotz从描述性表征和描绘性表征两个方面提出了多媒体学习＂图文理解整合模型＂（ITPC）,这一模型揭示了图文理解的过程机制,是当前多媒体学习认知理论模型的最新发展成果。     

Phonological and sensory short-term memory are correlates and both affected in developmental dyslexia

We investigated whether poor short-term memory (STM) in developmental dyslexia affects the processing of sensory stimulus sequences in addition to phonological material. STM for brief binary non-verbal stimuli (light flashes, tone bursts, finger touches, and their crossmodal combinations) was studied in 20 Finnish adults with dyslexia and 24 healthy controls. To determine sensory Item STM, participants were asked to match pairs of sequences of increasing length. In Time STM, participants matched pairs of five-stimulus-sequences of increasing stimulus onset asynchrony between the stimuli. Phonological STM was studied with digit span forwards and backwards, pseudoword span, pseudoword matching span, and pseudoword repetition. Earlier results associating phonological STM impairment with dyslexia were replicated. Dyslexic participants also performed more poorly than controls in sensory STM, suggesting that they have general difficulties in representing temporal sequences in STM. Further, sensory STM, phonological STM, temporal acuity, and reading ability were correlated, pointing to shared processes.     

Temporal resolution of auditory perception and verbal working memory in 15 children with language impairment

We investigated temporal resolution of auditory perception (TRAP), verbal working memory, and speech perception in 15 children with language impairment (LI) in comparison with a control group of 99 typical children. A computerized two-choice test was used to assess these three abilities. No deficits in TRAP were found in the LI group, and the thresholds were similar for both study groups. It was interesting that the variability was high for both groups and that the control group's performance was poorer than reported in some previously published studies. There were significant differences in the two groups' performance on speech perception and verbal working memory. Working memory was the most sensitive of these two measures.     

Poor performance on serial visual tasks in persons with reading disabilities: impaired working memory?

The present study investigates the performance of persons with reading disabilities (PRD) on a variety of sequential visual-comparison tasks that have different working-memory requirements. In addition, mediating relationships between the sequential comparison process and attention and memory skills were looked for. Our findings suggest that PRD perform worse than normally achieving readers (NAR) when the task requires more than a minimal amount of working memory, unrelated to presentation rate. We also demonstrate high correlations between performance on the task with the most working-memory demands and reading-related skills, suggesting that poor working-memory abilities may be one of the underlying mechanisms of dyslexia. The mediating model analysis indicates that order judgment tasks are mediating to verbal working memory, suggesting that visual sequence memory precedes auditory sequence memory. We further suggest that visual tasks involving sequential comparisons could probe for poor working memory in PRD.     

口译记忆中的关联机制及其对口译教学的启示

关联机制在口译记忆中起到信息选择的作用,决定了口译过程中瞬时记忆的关注点、短时记忆的内容以及工作记忆的处理对象和方式。对口译中源语听解和译语输出这两个阶段的分析揭示了口译员的认知语境与关联选择之间呈正比关系。因此,建议口译教学中在充实认知语境、增加长时记忆信息量的基础上,强化听辨推理训练。     

The development of nonverbal working memory and executive control processes in adolescents

The prefrontal cortex modulates executive control processes and structurally matures throughout adolescence. Consistent with these events, prefrontal functions that demand high levels of executive control may mature later than those that require working memory but decreased control. To test this hypothesis, adolescents (9 to 20 years old) completed nonverbal working memory tasks with varying levels of executive demands. Findings suggest that recall-guided action for single units of spatial information develops until 11 to 12 years. The ability to maintain and manipulate multiple spatial units develops until 13 to 15 years. Strategic self-organization develops until ages 16 to 17 years. Recognition memory did not appear to develop over this age range. Implications for prefrontal cortex organization by level of processing are discussed.     

Working memory for sign language: a window into the architecture of the working memory system

Traditionally, working memory has been divided into two major domains: verbal and visuo-spatial. The verbal domain of working memory can be characterized either by its relationship to language or by its grounding in auditory processing. Because of this ambiguity, languages that are not auditory and vocal (i.e., signed languages) pose a challenge to this conception of working memory. We describe several experiments with deaf users of American Sign Language (ASL) that explore the extent to which the architecture of working memory is determined by the constraints of auditory and visual processing and the extent to which it is determined by the characteristics of language. Various working memory effects were investigated: phonological similarity, word length, and articulatory suppression. The pattern of evidence strongly supports the existence of a sign-based 'rehearsal loop' mechanism parallel to the speech-based rehearsal loop. However, we also discuss evidence pointing to differences between the speech loop and the sign loop from forward and backward digit span tasks with deaf and hearing subjects. Despite their similarities based on linguistic properties, the speech loop and the sign loop appear to diverge due to the differing processing demands of audition and vision. Overall, the results suggest that the architecture of working memory is shaped both by the properties of language structure and by the constraints imposed by sensorimotor modality.     

Individual differences in children's writing: A function of working memory or reading or both processes?

The purpose of this study was to investigate whether a general or specific working memory (WM) system is related to writing and whether individual differences in reading and/or processing efficiency underlie the correlations between WM and writing. Two studies correlated WM with writing (Test of Written Language-TOWL) and reading measures. In Study 1, WM was correlated significantly with a number of writing measures, particularly to those measures related to text generation. Working-memory also contributed unique variance to writing, beyond what is predicted by reading comprehension. Study 2 compared the correlations of verbal and visual-spatial WM measures with the TOWL under initial and enhanced memory processing (dynamic assessment) conditions. The coefficients were statistically comparable between initial and enhanced processing conditions, suggesting that individual differences in processing efficiency do not account for the correlations between WM and writing. Overall, the results indicated that (a) WM measures contribute unique variance to writing, especially text generation, and (b) working memory performance improves under gain conditions, but this enhanced processing efficiency did not appear to mediate the links between WM and writing. Taken together, the two studies support a general capacity explanation for the relationship between working memory and text generation.     

文本阅读中时间信息的加工及其对文本理解的影响

总结了当今阅读心理研究领域关于文本理解中时间信息的加工及其对文本理解影响的研究。     

Working Memory,Mental Capacity and Science Education: towards an understanding of the ‘working memory overload hypothesis’

Abstract

Researchers in science education recognise the importance of information processing capacity as a constraint on the abilities and achievements of science students. This constraint has been referred to as ‘mental capacity’ or ‘working memory capacity’, with the latter leading to the so‐called ‘working memory overload hypothesis’. However, rarely have researchers in this area been explicit as to the nature or theory of the mental capacity or the working memory system to which these terms refer.

In this paper we outline two possible models which have proved useful in studies of information processing in other domains. The first model (of mental capacity) developed by Pascual‐Leone and his colleagues has been applied in science education with varying degrees of success. The second model (of working memory) developed by Baddeley and his colleagues has been very successful in accounting for a wide range of cognitive activity, although it has not been applied to science education hitherto. We conclude that consideration of elements of the working memory framework may well prove fruitful in science education.     

Young Children's Comprehension of Temporal Relations in Complex Sentences: The Influence of Memory on Performance

The present study investigated 3‐ to 7‐year‐olds' (N = 91) comprehension of two‐clause sentences containing the temporal connectives before or after. The youngest children used an order of mention strategy to interpret the relation between clauses: They were more accurate when the presentation order matched the chronological order of events: “He ate his lunch, before he played in the garden” (chronological) versus “Before he played in the garden, he ate his lunch” (reverse). Between 4 and 6 years, performance was influenced by a combination of factors that influenced processing load: connective type and presentation order. An independent measure of working memory was predictive of performance. The study concludes that the memory demands of some sentence structures limits young children's comprehension of sentences containing temporal connectives.     

Memory strategies and metamemory knowledge under memory demands change in waiters learners

This study aims to examine how adults use memory strategies when memory demands change and how it depends on metamemory and may account for individual differences. Metamemory about strategy was assessed by interview in forty waiters learners. Then, they were asked to execute a simulated beverage-service task (three successive recalls) for which memory demands were manipulated with table size and perceptive cues. At last, working memory span was assessed. Results revealed a significant contribution of the various variables (memory demands, metamemory knowledge, span) on recall performances when the three different recalls were considered as separated. By contrast, the four strategy patterns observed on this sample could not be distinguished neither according to metamemory knowledge nor as a function of performance. The issue about the individual differences in strategy efficiency is explored by pointing out methodological limits. Moreover, the non linear progression of performance with the increase in the level of elaborative strategy use is discussed.     

Hearing dogs: a longitudinal study of social and psychological effects on deaf and hard-of-hearing recipients

The organization Hearing Dogs for Deaf People provides assistance dogs that alert their deaf or hard-of-hearing recipients to key sounds, thus increasing their independence and also providing companionship. Fifty-one recipients took part in a longitudinal study to monitor the dogs' working performance over time and to examine the social and psychological effects of having a Hearing Dog. The Profile of Mood State (POMS) questionnaire and the General Health Questionnaire (GHQ) were used together with a Hearing Dog Questionnaire (HDQ) specifically developed for this study. There were a number of significant differences in measures of well-being between the period prior to placing the Hearing Dog and the period after placement, but there were no comparable differences during the year-long waiting period prior to placement of the dog. Recipients reported significant reductions in hearing-related problems such as response to environmental sounds; significant reductions in measures of tension, anxiety, and depression; and significant improvements in social involvement and independence. The longitudinal nature of this study supports evidence that these improvements persist for some time after the placement of a dog, with significant differences being reported, in many cases, up to 18 months after acquiring a dog.     

Working memory capacity and disfluency effect: an aptitude-treatment-interaction study

According to Cognitive Load Theory, learning material should be designed in a way to decrease unnecessary demands on working memory (WM). However, recent research has shown that additional demands on WM caused by less legible texts lead to better learning outcomes. This so-called disfluency effect can be assumed as a metacognitive regulation process during which learners assign their cognitive resources depending on the perceived difficulty of a cognitive task. Increasing the perceived difficulty associated with a cognitive task stimulates deeper processing and a more analytic and elaborative reasoning. Yet there are studies which could not replicate the disfluency effect indicating that disfluency might be beneficial only for learners with particular learner characteristics. Additional demands on working memory caused by disfluent texts are possibly just usable by learners with a high working memory capacity. Therefore the present study investigated the aptitude-treatment-interaction between working memory capacity and disfluency. Learning outcomes were measured by means of a retention, a comprehension, and a transfer test. Moreover, the three types of cognitive load (intrinsic, extraneous, and germane) were assessed. The results revealed significant aptitude-treatment-interaction effects with respect to retention and comprehension. Working memory capacity had a significant influence only in the disfluency condition: The higher the working memory capacity, the better the retention and comprehension performance in the disfluency condition. No effects were found with respect to transfer or cognitive load. Thus, the role of metacognitive regulation and its possible effects on cognitive load need further investigation.     

Adult developmental dyslexia in a shallow orthography: Are there subgroups?

The existence and stability of subgroups among adult dyslexic readers of a shallow orthography was explored by comparing three different cluster analyses based on previously suggested combinations of two variables. These were oral reading speed versus accuracy, word versus pseudoword reading speed, and phonological awareness versus rapid naming. The three analyses were conducted with the same group of dyslexic adults. Each analysis produced three subgroups, corresponding to ones previously suggested in the literature. However, the subgroups had only little overlap from one analysis to another. Each clustering produced somewhat different subgroup profiles in phonological processing, reading, intelligence, temporal acuity, and sensory short-term memory. However, the shared difficulties of the solutions in several language-related and sensory tasks suggest the conclusion that developmental dyslexia does not causally consist of subgroups, at least in shallow orthographies. Further, the shared sensory difficulties suggest that impaired temporal acuity and sensory short-term memory may reflect the severity of a primary disorder that dyslexic readers cannot compensate by strategies.     

Auditory frequency discrimination in children with dyslexia

A popular hypothesis holds that developmental dyslexia is caused by phonological processing problems and is therefore linked to difficulties in the analysis of spoken as well as written language. It has been suggested that these phonological deficits might be attributable to low‐level problems in processing the temporal fine structure of auditory cues. Evidence for this has come from studies showing poor performance of dyslexic individuals on measures of auditory frequency discrimination (FD). We compared the FD thresholds of 28 children with dyslexia to 28 age‐matched controls aged 6–13, on a task that minimised demands on short‐term memory. To investigate the mechanisms involved in potential FD deficits, FD thresholds were measured at 1 kHz, where temporal cues were available, and at 6 kHz, where they were not. The dyslexic group had significantly higher FD thresholds than controls in both the 1‐ and 6‐kHz conditions. These findings confirm that children with dyslexia often have poor FD, even when, as in this sample, they have normal language comprehension and expressive vocabulary, and when they are tested using a paradigm that minimises memory demands. However, their perceptual deficit was evident for both the 1‐ and 6‐kHz tones, and so cannot readily be explained in terms of problems in processing temporal fine structure.     

The development of mental processing: efficiency,working memory,and thinking

This Monograph aims to contribute to the information processing, the differential, and the developmental modeling of the mind, and to work these into an integrated theory. Toward this aim, a longitudinal study is presented that investigates the relations between processing efficiency, working memory, and problem solving from the age of 8 years to to the age of 16 years. The study involved 113 participants, about equally drawn among 8-, 10-, 12-, and 14-year-olds at the first testing; these participants were tested two more times spaced one year apart. Participants were tested with a large array of tasks addressed to processing efficiency (i.e., speed of processing and inhibition), working memory (in terms of Baddeley's model, phonological storage, visual storage, and the central executive of working memory), and problem solving (quantitative, spatial, and verbal reasoning). Confirmatory factor analysis validated the presence of each of the above dimensions and indicated that they are organized in a three-stratum hierarchy. The first stratum includes all of the individual dimensions mentioned above. These dimensions are organized, at the second stratum, in three constructs: processing efficiency, working memory, and problem solving. Finally, all second-order constructs are strongly related to a third-order general factor. This structure was stable in time. Structural equation modeling indicated that the various dimensions are interrelated in a cascade fashion so that more fundamental dimensions are part of more complex dimensions. That is, speed of processing is the most important aspect of processing efficiency, and it perfectly relates to the condition of inhibition, indicating that the more efficient one is in stimulus encoding and identification, the more efficient one is in inhibition. In turn, processing efficiency is strongly related to the condition of executive processes in working memory, which, in turn, is related to the condition of the two modality-specific stores (phonological and visual). Finally, problem solving is related to processing efficiency and working memory, the central executive in particular. All dimensions appear to change systematically with time. Growth modeling suggested that there are significant individual differences in attainment in each of the three aspects of the mind investigated. Moreover, each of the three aspects of the mind as well as their interrelations change differently during development. Mixture growth modeling suggested that there are four types of developing persons, each defined by a different combination of performance in these aspects of the mind. Some types are more efficient and stable developers than others. These analyses indicated that processing efficiency is a factor closely associated with developmental differences in problem solving, whereas working memory is associated with individual differences. Modeling by logistic equations uncovered the rates and form of change in the various dimensions and their reciprocal interactions during development. These findings are discussed from the point of view of information processing, differential, and developmental models of thinking, and an integrative model is proposed.