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Differentiating Real-World Autobiographical Experiences without Recourse to Behaviour.

ABSTRACT: Investigating human consciousness based on brain activity alone is a key challenge in cognitive neuroscience. One of its central facets, the ability to form autobiographical memories, has been investigated through several fMRI studies that have revealed a pattern of activity across a network of frontal, parietal, and medial temporal lobe regions when participants view personal photographs, as opposed to when they view photographs from someone else's life. Here, our goal was to attempt to decode when participants were re-experiencing an entire event, captured on video from a first-person perspective, relative to a very similar event experienced by someone else. Participants were asked to sit passively in a wheelchair while a researcher pushed them around a local mall. A small wearable camera was mounted on each participant, in order to capture autobiographical videos of the visit from a first-person perspective. One week later, participants were scanned while they passively viewed different categories of videos; some were autobiographical, while others were not. A machine-learning model was able to successfully classify the video categories above chance, both within and across participants, suggesting that there is a shared mechanism differentiating autobiographical experiences from non-autobiographical ones. Moreover, the classifier brain maps revealed that the fronto-parietal network, mid-temporal regions and extrastriate cortex were critical for differentiating between autobiographical and non-autobiographical memories. We argue that this novel paradigm captures the true nature of autobiographical memories, and is well suited to patients (e.g., with brain injuries) who may be unable to respond reliably to traditional experimental stimuli.

SUBMITTER: Erez J

PROVIDER: S-EPMC8074167 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Background:The Ontario MedsCheck program was introduced in April 2007, with enhancements to strengthen the program made in October 2016. Previous literature has characterized patients who received the service before the enhancements and described the experiences of community pharmacists and physicians, but the experiences of participants in the enhanced MedsCheck program and those of hospital pharmacists and pharmacy technicians have not been explored. Objectives:This study was designed to describe and compare the demographic and clinical characteristics of patients admitted to Sunnybrook Health Sciences Centre (SHSC) who had received a MedsCheck before and after the program enhancements of 2016. The study also aimed to describe the experiences of patients, hospital pharmacists, and pharmacy technicians with the MedsCheck program. Methods:Chart reviews were completed to identify and characterize patients who had received a MedsCheck and were admitted to SHSC between March and May 2016 (retrospective cohort) and between March and May 2017 (prospective cohort). Patients were interviewed and focus groups were conducted with pharmacy staff to explore their experiences with the MedsCheck program. Results:MedsChecks had been performed for 321 (14.5%) of 2216 patients in the retrospective cohort and 172 (6.8%) of 2547 patients in the prospective cohort, an absolute decline of 7.7% after the 2016 enhancements. Patient characteristics were similar between the 2 cohorts. Patients' experiences were varied, but because of low enrolment in the interview process (n = 3), it was difficult to identify and summarize common themes. The analysis of focus groups involving pharmacy staff (n = 27 participants) revealed that the benefits of MedsChecks depended on quality and access, and also identified common barriers and opportunities for future enhancements. Conclusions:Patient interviews revealed the features of the program that patients valued. Pharmacy staff identified several benefits and barriers encountered when using MedsChecks. These findings can guide clinicians in optimal application of the current MedsCheck program and can inform subsequent program revisions.

Project description:BackgroundThe autobiographical Implicit Association Test (aIAT) is a novel application of the implicit association concept for detecting life events. It has been used to reveal concealed knowledge in clinical and forensic settings, including detecting drug use. In this study, we aimed to explore the functionality of the aIAT to identify drug use in real-world settings.MethodsThe study used mixed methodology with known groups of drug users and nonusers. Recreational cocaine users (n = 23) and non-users (n = 23) were recruited through ethnographic methodology and assessed using a bespoke brief aIAT for cocaine use. An identical aIAT test for heroin detection was also administered to a sub-sample of 10 cocaine users and 13 nonusers. The accuracy of the cocaine aIAT was measured through ROC analysis. Paradoxical aIAT results were explored by integrating craving, consumption measures and life-story interviews into the analysis.ResultsWhilst the two brief aIATs showed good concurrent validity for cocaine users by accurately detecting drug using status for 18 of the 23 users (78.3%), the test falsely reported 61% cocaine users in the non-user comparison group. The average D-scores were 0.257±0.246 for the cocaine users and 0.134±0.367 for the non-users, showing no discriminatory power (t(44) = 1.339, p = 0.187; AUC = 0.605, p = 0.223). Results were independent from craving and recent cocaine use. The comparison group's cocaine and heroin aIAT scores correlated significantly (r(13) = 0.776, p = 0.002) whilst an accurate absence of such relationship was evidenced in the cocaine using sample (r(10) = 0.061, p = 0.866). Triangulation with life-story interviews suggests that in the absence of an autobiographical event, this test may measure an alternative cognitive construct linked to the Self-concept.ConclusionThe aIAT is a variant of an attitude measure and can be better rationalized if propositional thinking is implied to explain outcomes. The Relational Frame and Social Knowledge Structure theories can perhaps provide a more plausible theoretical background. Further work is required to clarify which factors underlie this testing technique's functioning. Reappraisal is advised before further forensic use of the instrument to ensure that general associations not related to autobiographical memory do not confound results.

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Differentiating Real-World Autobiographical Experiences without Recourse to Behaviour.

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