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Cortex; a Journal Devoted To the Study... May 2024Postpartum psychosis is a rare but serious condition that can affect women after childbirth. We present a case study of an individual with no comorbidities or...
Postpartum psychosis is a rare but serious condition that can affect women after childbirth. We present a case study of an individual with no comorbidities or psychiatric history who developed postpartum psychosis characterised by prominent misidentification delusions whilst admitted to hospital. The woman recovered quickly with medication and showed no evidence of relapse over the following three years. Whilst still symptomatic and after recovery, the patient was able to provide a detailed description of her experiences. Contemporaneous interviews and observations during her hospital admission and a subsequent detailed retrospective account provide a unique, comprehensive window into her experience of these time-limited delusions. Her case reveals important insights including the triggers for her misidentification delusions, the role of social and contextual influences on delusional beliefs, and her recall of active involvement in evaluating and discarding delusional hypotheses. These insights highlight the complexity of delusional beliefs, challenge existing theories of delusions, and help inform broader theories of belief formation.
PubMed: 38875734
DOI: 10.1016/j.cortex.2024.04.018 -
Animal Cognition Jun 2024Although events are not always known to be important when they occur, people can remember details about such incidentally encoded information using episodic memory....
Although events are not always known to be important when they occur, people can remember details about such incidentally encoded information using episodic memory. Sheridan et al. (2024) argued that rats replayed episodic memories of incidentally encoded information in an unexpected assessment of memory. In one task, rats reported the third-last item in an explicitly encoded list of trial-unique odors. In a second task, rats foraged in a radial maze in the absence of odors. On a critical test, rats foraged in the maze, but scented lids covered the food. Next, memory of the third-last odor was assessed. The rats correctly answered the unexpected question. Because the odors used in the critical test were the same as those used during training, automatically encoding odors for the purpose of taking an upcoming test of memory (stimulus generalization) may have been encouraged. Here, we provided an opportunity for incidental encoding of novel odors. Previously trained rats foraged in the radial maze with entirely novel odors covering the food. Next, memory of the third-last odor was assessed. The rats correctly answered the unexpected question. High accuracy when confronted with novel odors provides evidence that the rats did not automatically encode odors for the purpose of taking an upcoming test, ruling out stimulus generalization. We conclude that rats encode multiple pieces of putatively unimportant information, and later replayed a stream of novel episodic memories when that information was needed to solve an unexpected problem.
Topics: Animals; Odorants; Rats; Male; Maze Learning; Memory, Episodic; Olfactory Perception; Rats, Long-Evans; Mental Recall
PubMed: 38874623
DOI: 10.1007/s10071-024-01880-8 -
Noro Psikiyatri Arsivi 2024In this study, we aimed to examine the relationship between decision-making processes and other cognitive characteristics associated with Borderline Personality Disorder...
INTRODUCTION
In this study, we aimed to examine the relationship between decision-making processes and other cognitive characteristics associated with Borderline Personality Disorder (BPD) in comparison with healthy controls by using the neurocognitive tests.
METHOD
The sample of the study consists of the patient group diagnosed with BPD (n=27) and the voluntary participants without any psychiatric diagnosis (n=28). Borderline Personality Inventory (BPI) was used for psychiatric evaluation, and Iowa Gambling Test (IGT), Stroop Test, Benton Face Recognition Test, Reading the Mind in the Eyes Test, Dokuz Eylül Theory of Mind Scale (DEToM), WMS-R Digit Span and Logical Memory Subscales were administered for neuropsychological examination.
RESULTS
A significant difference was found between the BPD and the control group in BPI scores (p=0.02). There were no significant differences on the duration of interference and the number of errors in the Stroop Test, but it was observed that the number of spontaneous correction responses differed significantly (p=0.02) between the groups. A significant difference was revealed (p<0.01) in the immediate recall scores of the WMS-R Logical Memory (subtest story A) between the groups. There were also differences in the Iowa Gambling Test between the groups in the response tendency to choose from deck A (p=0.028) in the first half and from deck B (p=0.03) in the second half of the test. Finally, among the total scores of DEToM there was significant difference between the two groups (p<0.01), and this difference was prominent in the second-degree false belief (p=0.024) and empathy (p=0.027) tasks.
CONCLUSION
As a result of our study, it was concluded that individuals with BPD have minimal difficulty in inhibiting inappropriate response, and this difficulty is related to making disadvantageous choices in decision-making behavior. While BPD group was successful in predicting mental states from external cues in terms of social cognition, however, it was observed that they had difficulty integrating cues within a social pattern and making coherent narratives.
PubMed: 38868843
DOI: 10.29399/npa.28439 -
Cerebral Cortex (New York, N.Y. : 1991) Jun 2024When reminded of an unpleasant experience, people often try to exclude the unwanted memory from awareness, a process known as retrieval suppression. Here we used...
When reminded of an unpleasant experience, people often try to exclude the unwanted memory from awareness, a process known as retrieval suppression. Here we used multivariate decoding (MVPA) and representational similarity analyses on EEG data to track how suppression unfolds in time and to reveal its impact on item-specific cortical patterns. We presented reminders to aversive scenes and asked people to either suppress or to retrieve the scene. During suppression, mid-frontal theta power within the first 500 ms distinguished suppression from passive viewing of the reminder, indicating that suppression rapidly recruited control. During retrieval, we could discern EEG cortical patterns relating to individual memories-initially, based on theta-driven visual perception of the reminders (0 to 500 ms) and later, based on alpha-driven reinstatement of the aversive scene (500 to 3000 ms). Critically, suppressing retrieval weakened (during 360 to 600 ms) and eventually abolished item-specific cortical patterns, a robust effect that persisted until the reminder disappeared (780 to 3000 ms). Representational similarity analyses provided converging evidence that retrieval suppression weakened the representation of target scenes during the 500 to 3000 ms reinstatement window. Together, rapid top-down control during retrieval suppression abolished cortical patterns of individual memories, and precipitated later forgetting. These findings reveal a precise chronometry on the voluntary suppression of individual memories.
Topics: Humans; Male; Female; Young Adult; Adult; Awareness; Electroencephalography; Mental Recall; Consciousness; Memory; Visual Perception; Brain
PubMed: 38863114
DOI: 10.1093/cercor/bhae080 -
Juntendo Iji Zasshi = Juntendo Medical... 2023Previous studies have demonstrated that adolescents do not tend to actively engage in help-seeking behaviors. Therefore, it is imperative to create an environment where...
OBJECTIVES
Previous studies have demonstrated that adolescents do not tend to actively engage in help-seeking behaviors. Therefore, it is imperative to create an environment where adolescents can seek assistance on their own. However, no concrete method to create such environments has been established.
DESIGN
We studied adolescents' help-seeking behaviors by administering a questionnaire that collected information on who offer help ("helpers"), how help is offered ("methods of help"), and where these interactions occur ("places of help").
METHODS
We asked college students to recall their thoughts related to seeking help when they were 10-15 years old.
RESULTS
Our results indicated that adolescents require trustworthy helpers who respect and understand them, face-to-face interactions, peer helpers of a similar age, mental health dialog, and safe and secure location outside of school for seeking help.
CONCLUSIONS
This study suggested a method to provide assistance in the field of child mental health, which is crucial for the development of the adolescents' ability to seek help and resolve mental health problems on their own.
PubMed: 38855065
DOI: 10.14789/jmj.JMJ22-0046-OA -
Research Square May 2024Dysfunction in emotion regulation (ER) and autobiographical memory are components of major depressive disorder (MDD). However, little is known about how they...
Dysfunction in emotion regulation (ER) and autobiographical memory are components of major depressive disorder (MDD). However, little is known about how they mechanistically interact with mood disturbances in real time. Using machine learning-based neural signatures, we can quantify negative affect (NA), ER, and memory continuously to evaluate how these processes dynamically interact in MDD. Unmedicated individuals with MDD (=45) and healthy volunteers (HV; =38) completed a negative autobiographical memory functional magnetic resonance imaging task wherein they recalled, distanced from (an ER strategy), and immersed into memories. We used a negative affect signature (PINES) and an emotion regulation signature (ERS) to quantify moment-to-moment NA and ER. We then examined whether memory engagement, indexed by hippocampal activity, predicted subsequent change in PINES and ERS over time. During memory recall and immersion, greater hippocampal activity predicted increased PINES across groups. During distancing, greater hippocampal activity in HVs predicted increased ERS but not PINES. In MDD, greater hippocampal activity predicted increased PINES but not ERS. Findings suggest abnormalities in the real-time relationship between memory, NA, and ER in MDD. During distancing, as predicted, HVs showed an attenuation of the linkage between memory engagement and NA, and they had subsequent increases in ER following memory reactivation. In contrast, MDD was characterized by continued linkage between memory engagement and NA, without subsequent increases in ER. Deficits in engagement of ER and ineffective modulation of NA following negative memory recall may contribute to the mood disturbances in MDD and are potential targets for clinical intervention.
PubMed: 38854145
DOI: 10.21203/rs.3.rs-4298308/v1 -
Neuroscience and Biobehavioral Reviews Jun 2024Changes in sleep and dreams are often observed during pregnancy. Dreaming may represent privileged access to the inner world of individuals, providing relevant... (Review)
Review
Changes in sleep and dreams are often observed during pregnancy. Dreaming may represent privileged access to the inner world of individuals, providing relevant information about their well-being. For this reason, a growing but heterogeneous literature has investigated dream experiences of pregnant women. The present paper aimed to systematically review the available evidence on the relationship between pregnancy and oneric activity, focusing on dream and nightmare frequency, dream contents, and emotional features. Moreover, dream changes between pre-partum and post-partum periods and the impact of previous pregnancy-related adverse events on dreaming have been summarized. Overall, 17 studies have been examined. The reviewed evidence suggests that women tend to have an abundant production of dreams and nightmares during pregnancy, and some results support the view that a high rate of dream recall is associated with poor sleep quality. Most studies have shown a high presence of pregnancy-related dream content, likely reflecting waking experiences and concerns. Additionally, dreaming may promote psychological preparation and activation of functional coping strategies to face life changes after childbirth.
PubMed: 38852848
DOI: 10.1016/j.neubiorev.2024.105763 -
Brain Research Bulletin Aug 2024Tongue coating affects cognition, and cognitive decline at early stage also showed relations to functional and structural remodeling of superior temporal sulcus (STS) in...
Tongue coating affects cognition, and cognitive decline at early stage also showed relations to functional and structural remodeling of superior temporal sulcus (STS) in amnestic mild cognitive impairment (aMCI). The potential correlation between disparate cognitive manifestations in aMCI patients with different tongue coatings, and corresponding mechanisms of STS remodeling remains uncharted. In this case-control study, aMCI patients were divided into thin coating (n = 18) and thick coating (n = 21) groups. All participants underwent neuropsychological evaluations and multimodal magnetic resonance imaging. Group comparisons were conducted in clinical assessments and neuroimaging measures of banks of the STS (bankssts). Generalized linear models were constructed to explore relationships between neuroimaging measures and cognition. aMCI patients in the thick coating group exhibited significantly poorer immediate and delayed recall and slower information processing speed (IPS) (P < 0.05), and decreased functional connectivity (FC) of bilateral bankssts with frontoparietal cortices (P < 0.05, AlphaSim corrected) compared to the thin coating group. It was found notable correlations between cognition encompassing recall and IPS, and FC of bilateral bankssts with frontoparietal cortices (P < 0.05, Bonferroni's correction), as well as interaction effects of group × regional homogeneity (ReHo) of right bankssts on the first immediate recall (P < 0.05, Bonferroni's correction). aMCI patients with thick coating exhibited poor cognitive performance, which might be attributed to decreased FC seeding from bankssts. Our findings strengthen the understanding of brain reorganization of STS via which tongue coating status impacts cognition in patients with aMCI.
Topics: Humans; Cognitive Dysfunction; Male; Female; Aged; Temporal Lobe; Magnetic Resonance Imaging; Tongue; Case-Control Studies; Middle Aged; Neuropsychological Tests; Amnesia; Mental Recall
PubMed: 38844172
DOI: 10.1016/j.brainresbull.2024.110995 -
Journal of Neuroengineering and... Jun 2024Many individuals with neurodegenerative (NDD) and immune-mediated inflammatory disorders (IMID) experience debilitating fatigue. Currently, assessments of fatigue rely...
Evaluation of walking activity and gait to identify physical and mental fatigue in neurodegenerative and immune disorders: preliminary insights from the IDEA-FAST feasibility study.
BACKGROUND
Many individuals with neurodegenerative (NDD) and immune-mediated inflammatory disorders (IMID) experience debilitating fatigue. Currently, assessments of fatigue rely on patient reported outcomes (PROs), which are subjective and prone to recall biases. Wearable devices, however, provide objective and reliable estimates of gait, an essential component of health, and may present objective evidence of fatigue. This study explored the relationships between gait characteristics derived from an inertial measurement unit (IMU) and patient-reported fatigue in the IDEA-FAST feasibility study.
METHODS
Participants with IMIDs and NDDs (Parkinson's disease (PD), Huntington's disease (HD), rheumatoid arthritis (RA), systemic lupus erythematosus (SLE), primary Sjogren's syndrome (PSS), and inflammatory bowel disease (IBD)) wore a lower-back IMU continuously for up to 10 days at home. Concurrently, participants completed PROs (physical fatigue (PF) and mental fatigue (MF)) up to four times a day. Macro (volume, variability, pattern, and acceleration vector magnitude) and micro (pace, rhythm, variability, asymmetry, and postural control) gait characteristics were extracted from the accelerometer data. The associations of these measures with the PROs were evaluated using a generalised linear mixed-effects model (GLMM) and binary classification with machine learning.
RESULTS
Data were recorded from 72 participants: PD = 13, HD = 9, RA = 12, SLE = 9, PSS = 14, IBD = 15. For the GLMM, the variability of the non-walking bouts length (in seconds) with PF returned the highest conditional R2, 0.165, and with MF the highest marginal R2, 0.0018. For the machine learning classifiers, the highest accuracy of the current analysis was returned by the micro gait characteristics with an intrasubject cross validation method and MF as 56.90% (precision = 43.9%, recall = 51.4%). Overall, the acceleration vector magnitude, bout length variation, postural control, and gait rhythm were the most interesting characteristics for future analysis.
CONCLUSIONS
Counterintuitively, the outcomes indicate that there is a weak relationship between typical gait measures and abnormal fatigue. However, factors such as the COVID-19 pandemic may have impacted gait behaviours. Therefore, further investigations with a larger cohort are required to fully understand the relationship between gait and abnormal fatigue.
Topics: Humans; Feasibility Studies; Male; Female; Middle Aged; Fatigue; Walking; Aged; Mental Fatigue; Neurodegenerative Diseases; Gait; Wearable Electronic Devices; Immune System Diseases; Adult; Accelerometry
PubMed: 38840208
DOI: 10.1186/s12984-024-01390-1 -
Brain Stimulation 2024Recent studies indicate that both prefrontal and visual regions play critical roles in visual working memory (VWM), with prefrontal regions mainly associated with...
BACKGROUND
Recent studies indicate that both prefrontal and visual regions play critical roles in visual working memory (VWM), with prefrontal regions mainly associated with executive functions, and visual cortices linked to representations of memory contents. VWM involves the selective filtering of irrelevant information, yet the specific contributions of the prefrontal regions and visual cortex in this process remain unclear.
OBJECTIVE
To understand the dynamic causal roles of prefrontal and visual regions in VWM.
METHODS
The differentiation of VWM components was achieved using a computational model that incorporated a swap rate for non-target stimuli. Single-pulse magnetic transcranial stimulation (spTMS) was delivered to the early visual cortex (EVC) and the inferior frontal junction (IFJ) across different phases of an orientation recall task that with or without distractors.
RESULTS
Our results indicate that spTMS over the EVC and IFJ influences VWM particularly when distractors are present. VWM precision can be impacted by spTMS applied to either region during the early retention, while spTMS effect is especially prominent when EVC is stimulated during the late retention phase and when directed at the ipsilateral EVC. Conversely, the probability of accurately recalling the target exhibited comparable patterns when spTMS was administered to either the EVC or IFJ.
CONCLUSIONS
We highlight the "sensory recruitment" of VWM characterized by critical involvement of EVC particularly in the information-filtering process within VWM. The maintenance of memory content representations necessitates ongoing communication between the EVC and IFJ throughout the entirety of the VWM process in a dynamic pattern.
Topics: Humans; Memory, Short-Term; Transcranial Magnetic Stimulation; Visual Cortex; Visual Perception; Male; Adult; Female; Prefrontal Cortex; Mental Recall; Young Adult
PubMed: 38839040
DOI: 10.1016/j.brs.2024.06.001