Nevin Manimala

Exp Brain Res. 2022 Jun 21. doi: 10.1007/s00221-022-06394-8. Online ahead of print.

ABSTRACT

Cognitive flexibility is a core component of executive function and supports the ability to ‘switch’ between different tasks. Our group has examined the cost associated with switching between a prosaccade (i.e., a standard task requiring a saccade to veridical target location) and an antisaccade (i.e., a non-standard task requiring a saccade mirror-symmetrical to veridical target) in predictable (i.e., AABB) and unpredictable (e.g., AABAB…) switching paradigms. Results have shown that reaction times (RTs) for a prosaccade preceded by an antisaccade (i.e., task-switch trial) are longer than when preceded by its same task-type (i.e., task-repeat trial), whereas RTs for antisaccade task-switch and task-repeat trials do not differ. The asymmetrical switch-cost has been attributed to an antisaccade task-set inertia that proactively delays a subsequent prosaccade (i.e., the unidirectional prosaccade switch-cost). A salient question arising from previous work is whether the antisaccade task-set inertia passively dissipates or persistently influences prosaccade RTs. Accordingly, participants completed separate AABB (i.e., A = prosaccade, B = antisaccade) task-switching conditions wherein the preparation interval for each trial was ‘short’ (1000-2000 ms; i.e., the timeframe used in previous work), ‘medium’ (3000-4000 ms) and ‘long’ (5000-6000 ms). Results demonstrated a reliable prosaccade switch-cost for each condition (ps < 0.02) and two one-sided test statistics indicated that switch cost magnitudes were within an equivalence boundary (ps < 0.05). Hence, null and equivalence tests demonstrate that an antisaccade task-set inertia does not passively dissipate and represents a temporally persistent feature of oculomotor control.

PMID:35727365 | DOI:10.1007/s00221-022-06394-8

Biol Cybern. 2022 Jun 21. doi: 10.1007/s00422-022-00937-6. Online ahead of print.

ABSTRACT

In Bourlard and Kamp (Biol Cybern 59(4):291-294, 1998), it was theoretically proven that autoencoders (AE) with single hidden layer (previously called “auto-associative multilayer perceptrons”) were, in the best case, implementing singular value decomposition (SVD) Golub and Reinsch (Linear algebra, Singular value decomposition and least squares solutions, pp 134-151. Springer, 1971), equivalent to principal component analysis (PCA) Hotelling (Educ Psychol 24(6/7):417-441, 1993); Jolliffe (Principal component analysis, springer series in statistics, 2nd edn. Springer, New York ). That is, AE are able to derive the eigenvalues that represent the amount of variance covered by each component even with the presence of the nonlinear function (sigmoid-like, or any other nonlinear functions) present on their hidden units. Today, with the renewed interest in “deep neural networks” (DNN), multiple types of (deep) AE are being investigated as an alternative to manifold learning Cayton (Univ California San Diego Tech Rep 12(1-17):1, 2005) for conducting nonlinear feature extraction or fusion, each with its own specific (expected) properties. Many of those AE are currently being developed as powerful, nonlinear encoder-decoder models, or used to generate reduced and discriminant feature sets that are more amenable to different modeling and classification tasks. In this paper, we start by recalling and further clarifying the main conclusions of Bourlard and Kamp (Biol Cybern 59(4):291-294, 1998), supporting them by extensive empirical evidences, which were not possible to be provided previously (in 1988), due to the dataset and processing limitations. Upon full understanding of the underlying mechanisms, we show that it remains hard (although feasible) to go beyond the state-of-the-art PCA/SVD techniques for auto-association. Finally, we present a brief overview on different autoencoder models that are mainly in use today and discuss their rationale, relations and application areas.

PMID:35727351 | DOI:10.1007/s00422-022-00937-6

Psychol Rev. 2022 Apr;129(3):438-456. doi: 10.1037/rev0000351.

ABSTRACT

Many psychological experiments have subjects repeat a task to gain the statistical precision required to test quantitative theories of psychological performance. In such experiments, time-on-task can have sizable effects on performance, changing the psychological processes under investigation. Most research has either ignored these changes, treating the underlying process as static, or sacrificed some psychological content of the models for statistical simplicity. We use particle Markov chain Monte-Carlo methods to study psychologically plausible time-varying changes in model parameters. Using data from three highly cited experiments, we find strong evidence in favor of a hidden Markov switching process as an explanation of time-varying effects. This embodies the psychological assumption of “regime switching,” with subjects alternating between different cognitive states representing different modes of decision-making. The switching model explains key long- and short-term dynamic effects in the data. The central idea of our approach can be applied quite generally to quantitative psychological theories, beyond the models and datasets that we investigate. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

PMID:35727307 | DOI:10.1037/rev0000351

Perspect Psychiatr Care. 2022 Jun 21. doi: 10.1111/ppc.13128. Online ahead of print.

ABSTRACT

PURPOSE: To find out whether psychological capital has a mediating role in the relationship between job satisfaction and turnover intention on nurses.

DESIGN AND METHODS: This study is a cross-sectional descriptive study. 466 nurses participated in this study. Data were collected via paper-and-pencil format using Minnesota Satisfaction Questionnaire, Psychological Capital Questionnaire and Turnover Intention Scale.

CONCLUSIONS: Our findings revealed effects of poor psychological capital among nurses. The effect of psychological capital was statistically significant and it partially mediated job satisfaction and turnover intention.

PRACTICE IMPLICATIONS: Initiative sand training programs should be planned to improve nurses’ attitudes towards psychological capital levels.

PMID:35726709 | DOI:10.1111/ppc.13128

Nurs Forum. 2022 Jun 21. doi: 10.1111/nuf.12770. Online ahead of print.

ABSTRACT

BACKGROUND: Oral anticoagulation is the most common method to decrease the risk of stroke in people with atrial fibrillation.

PURPOSE: To assess the knowledge of Jordanian nurses about anticoagulation therapy, the effectiveness of educational courses in increasing their knowledge, and the factors that affect nurses’ changing knowledge following completion of an educational course.

METHOD: A pre/posttest quasi-experimental design was used. A total of 123 nurses participated in the study, identified by convenience sampling and recruited from five governmental hospitals in Jordan. To assess changes in knowledge between pre-and posttest, a questionnaire based on European cardiovascular nurses’ knowledge of anticoagulation therapy was used. An educational course was given to improve participants’ knowledge of anticoagulation therapy. The participants’ knowledge was assessed before and after the educational course. For data analysis, Statistical Package for the Social Sciences version 23 was used.

RESULTS: Nurses’ knowledge of anticoagulants was poor; however, a significant improvement was achieved following the educational course (M = 25.5, SD = 3.41), as compared to before conducting it (M = 12.2, SD = 5.3, t = 42.54, p < 0.001). Having an academic degree was found to affect the change in knowledge scores among participants (t = -3.52, p = 0.001).

CONCLUSION: The educational course was effective in improving the nurses’ knowledge. Baccalaureate degree holders achieved more improvement in their knowledge scores. Post-graduate education for nurses would help to improve their knowledge of anticoagulants. Revision of nursing curricula may be deemed necessary to improve the quality of education for nurses during their degree work, especially regarding anticoagulants.

PMID:35726697 | DOI:10.1111/nuf.12770

J Diabetes Investig. 2022 Jun 21. doi: 10.1111/jdi.13862. Online ahead of print.

ABSTRACT

OBJECTIVE: This study was conducted to assess the association of Dehydroepiandrosterone (DHEA) with diabetic nephropathy in patients with T2DM to better predict the progression of diabetic nephropathy.

METHODS: A total of 1082 patients with T2DM in the Department of Endocrinology and Metabolism of Tianjin Medical University General Hospital were inrolled in this study，and grouped for comparison.The effect of serum DHEA on DN was evaluated by multivariate Logistic regression analysis, and receiver operating characteristiccurves (ROC) were established to explore the optimal concentration of DHEA in patients with DN and non-DN.

RESULTS: DHEA was significantly decreased in patients with diabetic nephropathy (P < 0.001). The prevalence of diabetic nephropathy was significantly higher in the low DHEA quartile than in the other quartiles (P < 0.001).Spearman-related analysis showed that DHEA levels were negatively correlated with patient age, course of diabetes, systolic blood pressure, blood creatinine(Cr), uric acid(Ur), urine albumin-to-creatinine ratio (ACR), 24-hour urine microalbumin(24 h UMA), 24-hour urine protein quantification(24hUAER), and glomerular fltration rate(GFR), positively correlated with Body mass index (BMI) , total cholesterol(TC), and low density lipoprotein (LDL).Logistic regression analysis showed that the effect of DHEA on diabetic nephropathy was statistically significant (P< 0.001).The ROC curve showed that the sensitivity was 81.4%, the specificity was 70%, and the area under the curve was 0.812 when the optimal cut-off value was 1640 (pg/mL).

CONCLUSION: DHEA is significantly associated with DN and may be a protective factor for DN and is important for the prediction of DN.

PMID:35726691 | DOI:10.1111/jdi.13862

J Card Surg. 2022 Jun 21. doi: 10.1111/jocs.16699. Online ahead of print.

ABSTRACT

PURPOSE: The aim of the study was to analyze the surgical outcome of patients with total anomalous pulmonary venous connection (TAPVC) who underwent cardiac surgery.

METHODS: A retrospective study was carried out. Patients with diagnosis of TAPVC undergoing cardiac surgery at the National Institute of Cardiology Ignacio Chávez, from January 1, 2003 and June 30, 2019 were included. Descriptive statistics were calculated, as well as a bivariate analysis of the variables associated with mortality. A logistic regression model was included to determine risk factors associated with the main outcome and survival was analyzed using the Kaplan-Meier method.

RESULTS: A total of 5314 patients diagnosed with congenital heart disease (CHD) underwent surgery, 414 (7.8%) were patients with TAPVC, with an average age of 17.1 ± 34.6 months, 58.2% were male. It was frequent in infants (61.6%) and preschool (19.6%). Predominant type was supracardiac TAPVC (47.4%). Pulmonary venous obstruction (PVO) occurred in 32.1%. Risk factors associated with mortality were infracardiac TAPVC (odds ratio [OR]: 3.26; 95% confidence interval [CI]: 1.17-9.03; p = .02), PVO (OR: 2.56; 95% CI: 1.05-6.22; p = .03) and postoperative mechanical ventilation (OR: 1.005; 95% CI: 1.002-1.008; p = .01). Overall survival was 87.2%, with better outcomes in adolescents (100%), children (94.1%), mixed TAPVC (96%), and cardiac TAPVC (91.9%; p < .001).

CONCLUSIONS: The survival of our institution after surgical correction of TAPVC is similar to that of other referral centers, where patients with infracardiac TAPVC and newborns worse outcomes. All patients must undergo a rigorous evaluation to determine an adequate repair strategy.

PMID:35726661 | DOI:10.1111/jocs.16699

J Magn Reson Imaging. 2022 Jun 21. doi: 10.1002/jmri.28315. Online ahead of print.

ABSTRACT

BACKGROUND: A typical stroke MRI protocol includes perfusion-weighted imaging (PWI) and MR angiography (MRA), requiring a second dose of contrast agent. A deep learning method to acquire both PWI and MRA with single dose can resolve this issue.

PURPOSE: To acquire both PWI and MRA simultaneously using deep learning approaches.

STUDY TYPE: Retrospective.

SUBJECTS: A total of 60 patients (30-73 years old, 31 females) with ischemic symptoms due to occlusion or ≥50% stenosis (measured relative to proximal artery diameter) of the internal carotid artery, middle cerebral artery, or anterior cerebral artery. The 51/1/8 patient data were used as training/validation/test.

FIELD STRENGTH/SEQUENCE: A 3 T, time-resolved angiography with stochastic trajectory (contrast-enhanced MRA) and echo planar imaging (dynamic susceptibility contrast MRI, DSC-MRI).

ASSESSMENT: We investigated eight different U-Net architectures with different encoder/decoder sizes and with/without an adversarial network to generate perfusion maps from contrast-enhanced MRA. Relative cerebral blood volume (rCBV), relative cerebral blood flow (rCBF), mean transit time (MTT), and time-to-max (T_max ) were mapped from DSC-MRI and used as ground truth to train the networks and to generate the perfusion maps from the contrast-enhanced MRA input.

STATISTICAL TESTS: Normalized root mean square error, structural similarity (SSIM), peak signal-to-noise ratio (pSNR), DICE, and FID scores were calculated between the perfusion maps from DSC-MRI and contrast-enhanced MRA. One-tailed t-test was performed to check the significance of the improvements between networks. P values < 0.05 were considered significant.

RESULTS: The four perfusion maps were successfully extracted using the deep learning networks. U-net with multiple decoders and enhanced encoders showed the best performance (pSNR 24.7 ± 3.2 and SSIM 0.89 ± 0.08 for rCBV). DICE score in hypo-perfused area showed strong agreement between the generated perfusion maps and the ground truth (highest DICE: 0.95 ± 0.04).

DATA CONCLUSION: With the proposed approach, dynamic angiography MRI may provide vessel architecture and perfusion-relevant parameters simultaneously from a single scan.

EVIDENCE LEVEL: 3 TECHNICAL EFFICACY: Stage 5.

PMID:35726646 | DOI:10.1002/jmri.28315

Int J Epidemiol. 2022 Jun 21:dyac124. doi: 10.1093/ije/dyac124. Online ahead of print.

ABSTRACT

BACKGROUND: Previous studies had limited power to assess the associations of circulating insulin-like growth factors (IGFs) and IGF-binding proteins (IGFBPs) with clinically relevant prostate cancer as a primary endpoint, and the association of genetically predicted IGF-I with aggressive prostate cancer is not known. We aimed to investigate the associations of IGF-I, IGF-II, IGFBP-1, IGFBP-2 and IGFBP-3 concentrations with overall, aggressive and early-onset prostate cancer.

METHODS: Prospective analysis of biomarkers using the Endogenous Hormones, Nutritional Biomarkers and Prostate Cancer Collaborative Group dataset (up to 20 studies, 17 009 prostate cancer cases, including 2332 aggressive cases). Odds ratios (OR) and 95% confidence intervals (CI) for prostate cancer were estimated using conditional logistic regression. For IGF-I, two-sample Mendelian randomization (MR) analysis was undertaken using instruments identified using UK Biobank (158 444 men) and outcome data from PRACTICAL (up to 85 554 cases, including 15 167 aggressive cases). Additionally, we used colocalization to rule out confounding by linkage disequilibrium.

RESULTS: In observational analyses, IGF-I was positively associated with risks of overall (OR per 1 SD = 1.09: 95% CI 1.07, 1.11), aggressive (1.09: 1.03, 1.16) and possibly early-onset disease (1.11: 1.00, 1.24); associations were similar in MR analyses (OR per 1 SD = 1.07: 1.00, 1.15; 1.10: 1.01, 1.20; and 1.13; 0.98, 1.30, respectively). Colocalization also indicated a shared signal for IGF-I and prostate cancer (PP4: 99%). Men with higher IGF-II (1.06: 1.02, 1.11) and IGFBP-3 (1.08: 1.04, 1.11) had higher risks of overall prostate cancer, whereas higher IGFBP-1 was associated with a lower risk (0.95: 0.91, 0.99); these associations were attenuated following adjustment for IGF-I.

CONCLUSIONS: These findings support the role of IGF-I in the development of prostate cancer, including for aggressive disease.

PMID:35726641 | DOI:10.1093/ije/dyac124

J Intellect Disabil Res. 2022 Jun 21. doi: 10.1111/jir.12957. Online ahead of print.

ABSTRACT

BACKGROUND: Adults with Down syndrome (DS) are at increased risk of developing Alzheimer’s disease (AD) due to genetic predisposition. Identification of patients with AD is difficult since intellectual disabilities (ID) may confound diagnosis. The objective of this study was to evaluate the ability of the French version of the modified cued recall test (mCRT) to distinguish between subjects with and without AD in the adult DS population.

METHODS: This was a retrospective, single-centre, medical records study including data between March 2014 and July 2020. Adults aged ≥30 years with DS who had at least one mCRT record available were eligible. Age, sex and ID level were extracted, and subjects were attributed to three groups: patients with AD, patients with co-occurring conditions that may impact cognitive function and subjects without AD. mCRT scores, adjusted by sex, age and ID level, were compared between groups. The optimal cut-off value to distinguish between patients with and without AD was determined using the receiver operating characteristic curve. The impact of age and ID level on mCRT scores was assessed.

RESULTS: Overall, 194 patients with DS were included: 12 patients with AD, 94 patients with co-occurring conditions and 88 healthy subjects. Total recall scores were significantly lower (P < 0.0001) in patients with AD compared with healthy subjects. The optimal cut-off value to discriminate between patients with AD and healthy subjects was 22, which compares well with the cut-off value of 23 originally reported for the English version of the mCRT. Patients aged 30-44 years had higher mCRT total recall scores compared with patients aged ≥45 years (P = 0.0221). Similarly, patients with mild ID had higher mCRT scores compared with patients with severe ID (P < 0.0001).

INTERPRETATION: The mCRT is a sensitive tool that may help in the clinical diagnosis of AD in subjects with DS. Early recognition of AD is paramount to deliver appropriate interventions to this vulnerable population.

PMID:35726628 | DOI:10.1111/jir.12957