Everyday memory in adults with dyslexia

This chapter provides an overview of the cognitive challenges facing adults with dyslexia

A review of prospective memory impairments in developmental dyslexia: Evidence, explanations, and future directions

This is an Accepted Manuscript of an article published by Taylor & Francis in Clinical Neuropsychologist on 22 November 2017, available online: http://www.tandfonline.com/10.1080/13854046.2017.1369571 Objective: The effects of developmental dyslexia are not restricted solely to the processes involved in reading and spelling. Despite this broader impact on cognition, there has been very little dyslexia-related research on prospective memory (PM; memory for delayed intentions) until very recently. This paper focuses on reviewing a recent program of research which sought to explore this memory system in adults with dyslexia. Method: The review focuses mainly on studies of adults with dyslexia in which PM was compared with that of IQ-matched adults without dyslexia across clinical measures, computerized tests, self-report questionnaire, and more naturalistic tasks. Results: Across the reviewed studies, the adults with dyslexia showed a range of impairments in both laboratory and everyday settings. Dyslexia-related PM impairments occurred predominantly when cues to remembering were time-based rather than being cued by events in the environment, when delays to act upon the intention were prolonged, and when tasks were one-off events rather than being habitual. As well as being less accurate in their PM, the participants with dyslexia were also less likely to remember PM instructions over longer delay periods. Conclusions: PM deficits in dyslexia are considered in terms of the retrospective and prospective components of PM function. Less efficient access to verbal information in long-term memory, problems with time perception, and poorer executive functions are all considered as potential explanations for less accurate PM in dyslexia. The findings from the research program are linked to broader dyslexia theory and research. Means for supporting individuals with dyslexia are considered

Reducing quality control errors by guiding behavior

It is estimated that human error in the quality control checking of product labels on consumer packaging costs the UK retail industry £50m per annum. Our research program aimed to understand the behavior of individuals when performing label checks on fresh produce in order to inform the development of a software application designed to support quality control. On a simulated label checking task, eye-tracking data showed that individuals used different checking methods. A more systematic method led to higher accuracy. Two computer-assisted approaches, varying in the level of computer support provided, were then designed to push checkers towards systematic checking. Greater improvements in accuracy were found under the computer-assisted approaches than under a control condition. A three-month onsite trial of a software application designed on the basis of these research findings led to a 100% decrease in quality control errors

The impact of developmental dyslexia on workplace cognition: evidence from a virtual reality environment

The cognitive difficulties associated with dyslexia persist into adulthood but insights into their impact in employment settings are lacking. A virtual office environment was used to assess two areas of cognition frequently called upon in the workplace, executive function and prospective memory. Eight adults with dyslexia and 27 adults without dyslexia were tested on a virtual office task. They read a scenario describing their new role in an office and were given tasks to complete. The group with dyslexia performed worse overall. On the individual performance measures, the group with dyslexia scored lower on the selective-thinking and planning measures of executive function and also performed worse on two of the three prospective memory measures, namely event-based and time-based prospective memory. The findings indicate how dyslexia can affect workplace cognition, identifying areas in which support might be needed and highlighting areas of relative strength which might be harnessed

The impact of developmental dyslexia on workplace cognition: Evidence from a virtual reality environment

The cognitive difficulties associated with dyslexia persist into adulthood but insights into their impact in employment settings are lacking. A virtual office environment was used to assess two areas of cognition frequently called upon in the workplace, executive function and prospective memory. Eight adults with dyslexia and 27 adults without dyslexia were tested on a virtual office task. They read a scenario describing their new role in an office and were given tasks to complete. The group with dyslexia performed worse overall. On the individual performance measures, the group with dyslexia scored lower on the selective-thinking and planning measures of executive function and also performed worse on two of the three prospective memory measures, namely event-based and time-based prospective memory. The findings indicate how dyslexia can affect workplace cognition, identifying areas in which support might be needed and highlighting areas of relative strength which might be harnessed

Time-based prospective memory in adults with developmental dyslexia.

Prospective memory (PM) is memory for delayed intentions. Despite its importance to everyday life, the few studies on PM function in adults with dyslexia which exist have relied on self-report measures. To determine whether self-reported PM deficits can be measured objectively, laboratory-based PM tasks were administered to 24 adults with dyslexia and 25 age- and IQ-matched adults without dyslexia. Self-report data indicated that people with dyslexia felt that time-based PM (TBPM; requiring responses at certain times in the future) was most problematic for them and so this form of PM was the focus of investigation. Whilst performing the ongoing task from which they were required to break out every 3 min to make a PM-related response, the participants were allowed to make clock checks whenever they wished. The cognitive demands made on ongoing behaviour were manipulated to determine whether loading executive resources had a mediating role in dyslexia-related deficits in PM, resulting in three tasks with varying working memory load. A semi-naturalistic TBPM task was also administered, in which the participants were asked to remind the experimenter to save a data file 40 min after being given this instruction. Dyslexia-related differences were found across all three computerized tasks, regardless of cognitive load. The adults with dyslexia made fewer correct PM responses and also fewer clock checks. On the semi-naturalistic task, the participants with dyslexia were less likely to remember to remind the experimenter to save the file. This is the first study to document PM deficits in dyslexia using objective measures of performance. Since TBPM impairments were found under more naturalistic conditions as well as on computerized tasks, the results have implications for workplace support for adults with dyslexia

Does the face fit the facts? Testing three accounts of age of acquisition effects

Naming and perception tasks show robust effects of age of acquisition (AoA), with faster processing of stimuli learnt earlier in life compared to stimuli acquired later. That AoA effects prove to be more elusive on semantic processing tasks is of importance in attempting to determine the mechanism and locus (or loci) of AoA effects. Three accounts of AoA effects were tested empirically using perceptual familiarity decision tasks to record response latency and accuracy to the faces and names of famous people, with the quantity of semantic knowledge being manipulated. The results do not support the semantic ‘hub’ network or arbitrary mapping explanations of AoA but are consistent with the Set-up of a Specialized Processing System hypothesis

Mental time travel ability and the mental reinstatement of context for crime witnesses.

Mental time travel ability marks how well the phenomenological aspects of events are mentally re-experienced during recall. The Cognitive Interview (CI) elicits eyewitness information. One of its techniques, Mental Reinstatement of Context (MRC), asks eyewitnesses to reinstate the incident's context mentally before recall. Fifty-six participants watched a simulated crime video. Self-report measures were then taken to estimate general mental time travel ability. Participants were questioned subsequently about the video. Eyewitness performance under MRC was compared with the CI's Report Everything (RE) technique, wherein eyewitnesses recall everything they can but with no invitation to mentally reinstate the context. There was no effect of interview condition on accuracy of recall; however, general mental time travel ability was positively associated with the amount of correct and incorrect information produced under MRC, but not RE, conditions. This is the first empirical demonstration that MRC instructions engage the mental time travel capacities they purport to

The effects of age of acquisition and semantic congruency on famous person category verification

The age of acquisition (AoA) effect, a processing advantage for items learnt earlier in life, affects naming and making familiarity decisions about famous people. However, its influence on semantic processing tasks involving celebrity stimuli is equivocal. In a category verification task designed to explore this issue further, mature adults were shown an area of fame, followed by a famous person’s name. They were asked to indicate whether the area of fame and the celebrity matched. Stimulus congruency and AoA were manipulated orthogonally, with familiarity and facial distinctiveness being controlled. Faster and more accurate responses were produced when the area of fame and the celebrity matched. Faster and more accurate responses were made to early-acquired celebrities but the interaction fell short of significance but is consistent with that reported for lexical processing. With adequate control of extraneous variables and an extended distance between stimulus groups, AoA would seem to have an influence on the semantic processing of famous people and interacts near significance with congruency. The results are considered in the light of multiple loci theories of AoA

Do Baseline Executive Functions Mediate Prospective Memory Performance under a Moderate Dose of Alcohol?

Prospective memory (PM) is memory for delayed intentions. While deleterious effects of acute doses of alcohol on PM have been documented previously using between-subjects comparisons, the current study adopted a single blind placebo-controlled within-subjects design to explore whether the extent to which alcohol-related impairments in PM are mediated by executive functions (EFs). To this end, 52 male social drinkers with no history of substance-related treatment were tested using two parallel versions of a clinical measure of PM (the Memory for Intentions Test; Raskin et al., 2010), and a battery of EF measures. Testing took place on two occasions, with the order of administration of the alcohol and placebo conditions being fully counterbalanced. Overall, PM was worse under alcohol and participants showed deficits on five of the six subscales making up the clinical test. Hierarchical multiple regression analyses demonstrated that EFs did not predict PM performance decrements overall but did predict performance when time cues were presented and when verbal responses were required. Phonemic fluency was the strongest of the EF predictors; a greater capacity to gain controlled access to information in long-term memory predicted a smaller difference between placebo- and alcohol-related performance on both the time cue and verbal response scales. PM is crucial to compliance with, and response to, both therapy programs and alcohol harm prevention campaigns. The results indicate that individual differences in cognitive function need to be taken into account when designing such interventions in order to increase their effectiveness