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Sustained attention in traumatic brain injury (tbi) and healthy controls : enhanced sensitivity with dual-task load

Poor sustained attention or alertness is a common consequence of traumatic brain injury (TBI) and has a considerable impact on the recovery and adjustment of TBI patients. Here, we describe the development of a sensitive laboratory task in healthy subjects (Experiment 1) and its enhanced sensitivity to sustained attention errors in TBI patients (Experiment 2). The task involves withholding a key press to an infrequent no-go target embedded within a predictable sequence of numbers (primary goal) and detecting grey-coloured targets within the sequence (secondary goal). In Experiment 1, we report that neurologically healthy subjects are more likely to experience a lapse of attention and neglect the primary task goal, despite ceiling performance on the secondary task. Further, attentional lapses on the task correlated with everyday attentional failures and variability of response time. In Experiment 2, the task discriminates between TBI patients and controls with a large effect size. The dual-task yields more errors in both groups than a simple task involving only the primary goal that is commonly used to detect sustained attention deficits in neurologically impaired groups. TBI patients’ errors also correlated with everyday cognitive failures and variability of response time. This was not the case in the simple version of the task. We conclude that the dual-task demand associated with this task enhances its sensitivity as a measure of sustained attention in TBI patients and neurologically healthy controls that relates to everyday slips of attention.

Awareness of deficits in traumatic brain injury: a multidimensional approach to assessing metacognitive knowledge and online-awareness.

Recent models of impaired awareness in brain injury draw a distinction between metacognitive knowledge of difficulties and online awareness of errors (emergent and anticipatory). We examined performance of 31 Traumatic Brain Injury (TBI) participants and 31 healthy controls using a three-strand approach to assessing awareness. Metacognitive knowledge was assessed with an awareness interview and discrepancy scores on three questionnaires--Patient Competency Rating Scale, Frontal Systems Behavioral Scale and the Cognitive Failures Questionnaire. Online Emergent Awareness was assessed using an online error-monitoring task while participants performed tasks of sustained attention. Online anticipatory awareness was examined using prediction performance on two cognitive tasks. Results indicated that the TBI Low Self-Awareness (SA) group and High SA group did not differ in terms of severity, chronicity or standard neuropsychological tasks but those with Low SA were more likely to exhibit disinhibition, interpersonal problems and more difficulties in total competency. Sustained attention abilities were associated with both types of online awareness (emergent and anticipatory). There was a strong relationship between online emergent and online anticipatory awareness. Metacognitive knowledge did not correlate with the other two measures. This study highlights the necessity in adopting a multidimensional approach to assessing the multifaceted phenomenon of awareness of deficits.

Characterising error-awareness of attentional lapses and inhibitory control failures in patients with traumatic brain injury

Awareness deficits are a significant problem following traumatic brain injury (TBI). This study examined error processing as candidate marker of awareness and compared the performance of 18 TBI participants and 18 controls using an online error-monitoring task while participants performed simple go/no-go tasks. Error-monitoring performance was compared where the no-go target was part of (a) a predictive sequence, (b) predictive sequence plus a dual-task element and (c) a random sequence. Results showed that the TBI participants, in contrast to control participants, were significantly impaired at monitoring their errors during both predictive sequence tasks but were not impaired on the random sequence task. These findings suggest that following TBI, when an error is more impulsive it may be more easily monitored, whereas when an error is characterised by attentional drift, subsequent error-processing mechanisms may fail to engage. Higher levels of online error-awareness were also associated with lower levels of anxiety, fewer symptoms of frontal dysfunction and greater competence in everyday functioning.

Emotional distress and awareness following acquired brain injury: An exploratory analysis

Background: Symptoms of depression and anxiety are commonly reported following brain injury, providing ongoing challenges to patients, clinicians and carers. There is increasing interest in the influence of impaired awareness on emotional distress, supported by psychological investigations. Objective: To explore the relationship between awareness and time since injury on reported emotional distress. Method: Awareness was assessed by comparing the reports of persons with brain injury to the reports of their treating clinicians and significant others. Fifty-four participants with acquired brain injury (ABI) completed the Awareness Questionnaire, the Dysexecutive Questionnaire and the Hospital Anxiety and Depression Scales. Clinicians and significant others completed the Awareness Questionnaire and the Dysexecutive Questionnaire in relation to each participant. Results: Analyses of variance identified a main effect of awareness, such that participants with better awareness of their difficulties had higher emotional distress, regardless of time since injury. Conclusion: Findings support psychological theories suggesting that emotional distress is a response to the stressor of a brain injury and denial of difficulty, manifesting as impaired awareness, may play a protective role. They highlight the importance of understanding a patients level of awareness so as to provide support aimed at minimizing the impact of distress on the rehabilitation outcome.

A qualitative exploration of how individuals reconstruct their sense of self following acquired brain injury in comparison with spinal cord injury

Abstract Primary objective: The present study aimed to investigate the specific ways in which individuals reconstruct their sense of self following injury to the nervous system, by comparing individuals with acquired brain injury (ABI) and individuals with spinal cord injury (SCI), two groups that have experienced a sudden-onset injury with life-changing repercussions. Research design: Phenomenological qualitative research. Methods and procedures: Nine individuals with ABI and 10 individuals with SCI took part in an interview exploring the ways in which individuals reconstruct their sense of self following injury. Data were analysed using interpretative thematic analysis. Main outcomes and results: Findings showed similar themes identified within the interview data of the ABI and SCI groups. Both groups developed positive and negative self-narratives. Individuals employed strategies that facilitated the reconstruction of positive self-narratives. In addition, individuals described their sense of self as simultaneously continuous and changing. Discussion: Findings are discussed in relation to proposed models of self-reconstruction post-injury to the nervous system.

The contribution of retrospective memory, attention and executive functions to the prospective and retrospective components of prospective memory following TBI

Primary objective: Despite the prevalence of prospective memory (PM) problems, relatively little is known about the processes underlying impairment following TBI. This study sought to examine PM performance, using a multiple-task, multiple-response video-based paradigm in which initial encoding of the cue-action associations was ensured (Video-Assessment of Prospective Memory; VAPM). Research design: VAPM was designed to allow easy identification of reasons for failure (i.e. cue detection and/or specific action retrieval). Patients with moderate/severe TBI (n = 32) and matched controls (n = 16) also completed standardized neuropsychological assessment including evaluation of episodic retrospective memory (RM), attention, information processing, executive functions and mood. Main outcomes and results: As a group, those with TBI were impaired on PM tasks with 50% failing to complete at least 2/6 required tasks despite near perfect performance by controls. Individual profile analyses revealed different reasons for impairment, with RM contributing significantly to both the prospective and retrospective components. This was supported by correlational analyses illustrating a significant relationship between cue detection and RM measures, in addition to measures of executive functions and attention. Conclusions: The contribution of RM to both components of PM, along with the finding of heterogeneity in performance among participants have important implications for theoretical understanding and clinical practice.

Effectiveness of an unmodified personal digital assistant as a compensatory strategy for prospective memory failures in adults with an ABI

Prospective memory (PM), persisting and disabling problem following acquired brain injury (ABI). It is widely accepted that compensatory strategies are the treatment of choice in the rehabilitation of PM deficits. The advent of new technologies has broadened the array of external memory aids to include potentially useful personal digital assistants (PDAs) in alleviating PM deficits. This study aimed to investigate the effectiveness of an unmodified off-the-shelf PDA (Palm IIIe®) in compensating for everyday PM problems. Five participants with ABI were trained to programme the PDA to prompt them with an audible cue and on-screen message at appropriate times. Seven personally relevant PM tasks were set up weekly to measure the usefulness of the PDA as compared to relying on memory alone. An A-B quasi-experimental design was employed which consisted of two phases: the A (memory only) baseline phase and the B (PDA strategy) intervention phase. Task performance was compared between phases A and B. All particip...

Rehabilitation psychology: Meeting the needs of individuals with acquired disabilities in Ireland

Purpose. The current articles reviews the epidemiology of disability in Ireland, discusses the political and social factors which have increased focus on disability issues and offers training guidelines for rehabilitation psychology based on those of the APAs Rehabilitation Psychology Division. Rationale. With the growing number of individuals with acquired (vs developmental) disabilities in Ireland, there is increased recognition of the need to train psychologists to assist persons with acquired disabilities (e.g. spinal cord injury, acquired brain injury, stroke, etc.) in adjusting to their impairments, reintegrating back into their communities and reducing the long-term financial costs associated with disability. Conclusion. Social and political factors suggest that the time is right to develop rehabilitation psychology as a specialty in Ireland given the increased focus on disability in Ireland, including recently passed disability legislation (i.e. 2005 Disability Bill), international events (e.g. 2003 Dublin World Special Olympics) and increases in rehabilitation training programmes (i.e. medicine; physio, occupational and speech therapy).

Connecting Self-Awareness and Error-Awareness in Patients with Traumatic Brain Injury.

Impaired self-awareness after traumatic brain injury (TBI) is often seen in stark contrast to the observations of significant-others, who are acutely aware of the difficulties experienced by patients. Our objective was to investigate the relationship between metacognitive knowledge in daily life and emergent awareness of errors during laboratory tasks, since the breakdown of error detection mechanisms may impose limitations on the recovery of metacognitive knowledge after TBI. We also examined the extent to which these measures of awareness can predict dysexecutive behaviors. A sample of TBI patients (n=62) and their significant-others, provided reports of daily functioning post injury. In addition, patients underwent a neuropsychological assessment and were instructed to signal their errors during go/no-go tests. Interrelationships between metacognitive and emergent levels of awareness were examined, after controlling for the influence of secondary cognitive variables. Significant-other ratings correlated with errors made by the patients on neuropsychological tests but not with their premorbid function. Patients who under-reported daily life difficulties or over-reported their competency, compared to significant-other reports, were less likely to show awareness of laboratory errors. Emergent awareness was also identified as the sole predictor of performance on the modified six-element test, an ecologically valid test of multitasking. The online breakdown of error awareness after brain injury is related to difficulties with metacognitive awareness as reported in daily life, and is also predictive of dysexecutive behaviors. These findings are discussed in the context of multidimensional and neural models of awareness and error monitoring.

Impaired self-awareness following acquired brain injury: current theory, models and anatomical understanding

Acquired brain injury/illness (ABI) can lead to a range of cognitive, physical, emotional, social and behavioural sequelae. Unawareness of these deficits and of errors made in activities of everyday living can be a significant barrier for successful outcomes in rehabilitation following ABI. This review presents several theories and clinical models that propose multiple psychological, neuropsychological and biopsychosocial underpinnings of impaired self-awareness (ISA). Current knowledge regarding neuropathology of awareness is discussed, highlighting the widespread locations and connections within the brain that are implicated in awareness. Clinical practice promotes a client-centred approach to rehabilitation that acknowledges the multiple contributing factors of ISA post-ABI. This review discusses the merits of theories and clinical models in providing a useful framework for assessing and treating the multifaceted and complex phenomenon of ISA following ABI.