How Does Performing Demanding Activities Influence Prospective Memory? A Systematic Review

Prospective Memory Complaints Are Related to Objective Performance in People With Multiple Sclerosis

OBJECTIVES

To examine the association between subjective and objective prospective memory (PM) in people with multiple sclerosis (PwMS).

DESIGN

Secondary analysis of a cross-sectional cohort study.

SETTING

Community-based comprehensive multiple sclerosis center.

PARTICIPANTS

PwMS (N=112) who completed a battery that included measures of PM, depression, and fatigue.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Objective PM was measured with the performance-based Memory for Intentions Test (MIST), whereas subjective PM was assessed with the self-report Perceived Deficits Questionnaire-Prospective Memory (PDQ-PM).

RESULTS

PwMS had low scores on the PDDS (median=2) and HADS-D (median=5.29), with 26.8% scoring 1 standard deviation or lower (≤15th percentile) on the MIST. Objective PM was significantly associated with subjective PM in a multivariate model (β=-0.18, P=.036), which accounted for demographics, physical disability, retrospective memory, and depressive and fatigue severity. Physical disability, depression, and fatigue were also significant contributors to subjective PM. Time-based PM performance emerged as the specific component that was associated with subjective PM.

CONCLUSIONS

These findings suggest that among PwMS with relatively mild impairment and symptomatology, their objective PM performance was associated with their self-assessments, even when considering retrospective memory and factors that influence their cognitive perceptions. The results expand upon the subjective-objective cognition discrepancy literature in multiple sclerosis and highlights how the PDQ-PM could be used as a complementary measure to help identify difficulties with PM.

The role of cue salience in prospective memory commission errors in nonperformed nonfocal tasks

Prospective memory (PM) refers to the ability to remember to execute an intention in the future without having a permanent reminder. These intentions can be performed when they are not relevant or become no-longer needed, the so-called "commission errors". The present study aims to understand the effect of cue salience on PM commission errors with unperformed intentions and on the ongoing task performance-associated costs. Through a between-subjects design, eighty-one participants were assigned to 3 conditions: the no-PM condition, which served as control, and the salient and nonsalient conditions, which were asked to perform a lexical decision task and an incomplete nonfocal prospective memory task (i.e. no PM cues were presented). Subsequently, participants were instructed to no longer execute the prospective intention. In the second phase, a lexical decision task occurred again, including irrelevant PM cues, which should not be answered as such. In the salient condition, cues were salient (i.e. presented in red or blue background). In contrast, in the nonsalient condition, PM cues appeared on a black background, as any other stimuli. In the no-PM control condition, participants only performed an LDT. A commission error occurred when the (irrelevant) intention was performed in this second phase. Results showed that more participants performed a commission error in the presence of salient cues, even when PM intentions became irrelevant. Additionally, when cues were not salient, participants took longer to answer the LDT, as reasoned by the spontaneous retrieval theory. These findings are discussed according to the dual-mechanism account.

Improving prospective memory in persons with multiple sclerosis via telehealth: A randomized feasibility study

BACKGROUND

Persons with multiple sclerosis (PwMS) can experience deficits in prospective memory (PM) or "remembering to remember," which are associated with functional difficulties. However, no cognitive rehabilitation intervention has specifically addressed improving PM in PwMS. The Telehealth PM Intervention (TPMI) provides a novel combination of two strategies-visual imagery and implementation intentions-that have each been beneficial in other populations. This study aimed to evaluate the feasibility of TPMI and its preliminary efficacy, which could be used to inform future trials.

METHODS

Participants (n = 35) were PwMS who were pre-screened and endorsed experiencing problems "remembering places they have to be" and "things they have to do." After completing a baseline evaluation, which included objective (Memory for Intentions Test; MIST) and subjective (Perceived Deficits Questionnaire; PDQ-PM) measures of PM, participants were randomized to either the active treatment (TPMI; n = 17) or active control group (Control; n = 18). TPMI was offered through remote one-on-one sessions twice a week over a four-week period. Participants were asked about treatment credibility and expectancy during the first session. The MIST and PDQ-PM were repeated at post-treatment, where treatment satisfaction was also captured. Mann-Whitney U and chi-square tests were used to examine the feasibility measures, while repeated measures ANOVAs were used to examine changes in the PM outcomes.

RESULTS

A total of 88.2 % of the TPMI group completed all eight sessions, with moderate-to-high (≥7 out of 10) treatment credibility/expectancy and satisfaction reported by 93.3 % and 86.7 %, respectively. While there were no significant effects on overall PM, the TPMI group had an improvement in objective time-based PM after adjusting for baseline differences (F(1,29) = 4.61, p = 0.040; d = 0.80). Furthermore, the TPMI group had a significant reduction in the number of time-based loss of content errors compared to the Control group, which remained significant after covariate adjustment (F(1,25) = 4.29, p = 0.049; d = 0.83).

CONCLUSIONS

TPMI is a feasible intervention, with high completion rates and moderate-to-high treatment ratings, that can be delivered remotely. Early evidence shows its potential benefit for improving time-based PM, a particular concern for PwMS, which should be further evaluated in a larger clinical trial.

Patterns of prospective memory errors differ in persons with multiple sclerosis

INTRODUCTION

Prospective memory (PM) deficits have been documented in multiple sclerosis (MS). This study aimed to explore the specific types of errors made by persons with MS (PwMS), including differences between PwMS and healthy controls (HC) and PwMS who do and do not have impairments in processing speed and/or verbal learning and memory.

METHOD

PwMS (n = 111) and HC (n = 75) completed the Memory for Intentions Test (MIST), an objective measure of PM that has five types of errors that can be coded (PM failure, task substitution, loss of content, loss of time, and random errors). The number and types of PM errors were calculated for the overall MIST and six subscales, which break down performance by types of delay (2-Minute and 15-Minute), cue (Time and Event), and response (Verbal and Action). Impairment was defined as performing < 1.5 SD on either the Symbol Digit Modalities Test (SDMT) or Rey Auditory Verbal Learning Test (RAVLT). Bivariate analyses were used to examine group differences, with post-hoc pairwise comparisons with Bonferroni corrections.

RESULTS

Nearly 93% of PwMS made at least one PM error, compared to 76% of HC (V = .24, p = .001). The most commonly made PM error by PwMS was loss of content errors (45.0%). PwMS made significantly more task substitution errors (26.4% vs. 7.6%, p < .001) and fewer loss of time errors (9.5% vs. 21.2%, p < .001) than HC. Impaired PwMS made more errors than non-impaired PwMS, specifically PM failures on time-based tasks.

CONCLUSIONS

PM errors are common in PwMS, particularly when there are longer delays and time-based cues. Not only do PwMS make more errors than demographically similar HC, but they exhibit different cognitive process failures.

Prospective memory: the combined impact of cognitive load and task focality

Prospective Memory (PM) entails a set of executive processes primarily associated with the activation of frontal and parietal regions. Both the number of PM-targets to be monitored (i.e. task load) and the relationship between the type of PM-targets and the ongoing (ONG) task (i.e. task focality) can impact executive monitoring and PM performance. In the present imaging study, we manipulated load and focality of an event-based PM task to test the hypothesis that common resources engage in situations requiring high levels of cognitive control: that is, in high-load (i.e. monitor multiple PM-targets) and non-focal conditions (i.e. monitor at the same time letters' identity and color). We investigated monitoring-related and detection-related processes by assessing behavior and brain activity separately for ONG trials (monitoring) and PM-targets (detection). At the behavioral level, we found a significant interaction between load and focality during detection, with slowest reaction times for focal, high-load PM-targets. The imaging analyses of the detection phase revealed the activation of the left intraparietal sulcus in the high-load conditions. Both in the monitoring and the detection phases, we found overlapping effects of non-focality and low-load in the fusiform gyrus. Our results suggest that under low-load conditions, cognitive control operates via early selection mechanisms in the ventral occipito-temporal cortex. By contrast, high-load conditions entail control at later processing stages within the dorsal parietal cortex. We conclude that load and focality operate via different mechanisms, with the level of task load largely determining how cognitive control selects the most relevant information.

The Human Factor in Maritime Transport: Personality and Aggression Levels of Master Mariners and Navigation Students

The current study sought to identify groups of navigation students and master mariners (captains) characterized by different constellations of the Big Five personality traits and aggression levels. We hypothesized that master mariners would exhibit the resilient personality type and that navigation students would additionally exhibit personality types other than the resilient (e.g., over- or undercontrolled). A sample of 108 navigation students (men, in their second or third year of naval school, all active athletes) and 76 master mariners took part in the study and completed the Polish version of the NEO Five-Factor Inventory (Costa & McCrae, 1992; Zawadzki et al., 1998) and the Aggression Questionnaire (Buss & Perry, 1992; Tucholska, 1998). The hypothesis about the resilient personality type among master mariners was confirmed. The second hypothesis about personality types other than the resilient among navigation students was also confirmed: 33% of the students exhibited the overcontrolling personality type. The article also highlights the need to include psychological assessment in naval school enrolment procedures.

From retrospective to prospective memory research: a framework for investigating the deactivation of intentions

The definition of episodic memory has evolved into a multifaceted concept that gathered great attention in several research areas in psychology and neuroscience. Prospective memory (PM), or the ability to remember to perform delayed intentions at a later moment in the future, represents one side of this capacity for which that has been a growing interest. In this review, we examined a counterintuitive finding: PM intentions may persist and affect our behaviour despite successful goal attainment and task completion, which in daily life may be as serious as taking medication twice. This review aims to elucidate the existing knowledge and identify some unresolved questions concerning this specific memory failure. Therefore, this review provides an overview of the uprising research dedicated to both PM omission and commission errors, including an analysis of its definitions, of the current theoretical approaches of PM retrieval, and the main procedures used in this field to offer an integrative perspective on this topic. Finally, the last section is devoted to discussing future directions to test the predictions of our suggested theoretical explanations for PM deactivation. This might be an avenue for research that is likely to extend our understanding of episodic memory's usefulness in everyday life.