Now I like it, now I don’t: Delay effects and retrospective judgment.

The present paper tests the widely accepted hypothesis that on-line judgment implies functional independence between memory for, and judgment of, verbal stimuli (e.g., Anderson, 1989; Hastie & Park, 1986). In the present study, participants recalled lists of words, after having assessed each for its pleasantness. Presentation position of a negative item within the lists was manipulated. Also, items memorability was manipulated after their presentation – by inserting a filled delay between presentation and the judgment task; in this way, on-line judgment formation was spared. The memory manipulation reduced recall rates for negative items presented in the last position – and their negative influence on pleasantness ratings accordingly. These results contradict the predictions of pure on-line approaches to judgment formation (e.g., Betsch, Plessner, Schwieren, & Gütig, 2001) and suggest that even in on-line judgment tasks, memory plays a role

Exact solutions for ground effect

"Ground effect" refers to the enhanced performance enjoyed by fliers or swimmers operating close to the ground. We derive a number of exact solutions for this phenomenon, thereby elucidating the underlying physical mechanisms involved in ground effect. Unlike previous analytic studies, our solutions are not restricted to particular parameter regimes such as "weak" or "extreme" ground effect, and do not even require thin aerofoil theory. Moreover, the solutions are valid for a hitherto intractable range of flow phenomena including point vortices, uniform and straining flows, unsteady motions of the wing, and the Kutta condition. We model the ground effect as the potential flow past a wing inclined above a flat wall. The solution of the model requires two steps: firstly, a coordinate transformation between the physical domain and a concentric annulus, and secondly, the solution of the potential flow problem inside the annulus. We show that both steps can be solved by introducing a new special function which is straightforward to compute. Moreover, the ensuing solutions are simple to express and offer new insight into the mathematical structure of ground effect. In order to identify the missing physics in our potential flow model, we compare our solutions against new experimental data. The experiments show that boundary layer separation on the wing and wall occurs at small angles of attack, and we suggest ways in which our model could be extended to account for these effects.Comment: Main body: 10 pages & 3 figures; supplementary material: 6 pages & 5 figures. Submitted to JFM Rapid

Retrospective Evaluations of Sequences: Testing the Predictions of a Memory-based Analysis

Retrospective evaluation (RE) of event sequences are known to be biased in various ways. The present paper presents a series of studies that examined the suggestion that the moments that are the most accessible in memory at the point of RE contribute to these biases. As predicted by this memory-based analysis, Experiment 1 showed that pleasantness ratings of word lists were biased by the presentation position of a negative item and by how easy the negative information was to retrieve. Experiment 2 ruled out the hypothesis that these findings were due to the dual nature of the task called upon. Experiment 3 further manipulated the memorability of the negative items—and corresponding changes in RE were as predicted. Finally, Experiment 4 extended the findings to more complex stimuli involving event narratives. Overall, the results suggest that assessments were adjusted based on the retrieval of the most readily available information

Using a Ladder of Seeps with computer decision processes to explore for and evaluate cold seeps on the Costa Rica active margin

© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Vrolijk, P., Summa, L., Ayton, B., Nomikou, P., Huepers, A., Kinnaman, F., Sylva, S., Valentine, D., & Camilli, R. Using a Ladder of Seeps with computer decision processes to explore for and evaluate cold seeps on the Costa Rica active margin. Frontiers in Earth Science, 9, (2021): 601019, https://doi.org/10.3389/feart.2021.601019.Natural seeps occur at the seafloor as loci of fluid flow where the flux of chemical compounds into the ocean supports unique biologic communities and provides access to proxy samples of deep subsurface processes. Cold seeps accomplish this with minimal heat flux. While individual expertize is applied to locate seeps, such knowledge is nowhere consolidated in the literature, nor are there explicit approaches for identifying specific seep types to address discrete scientific questions. Moreover, autonomous exploration for seeps lacks any clear framework for efficient seep identification and classification. To address these shortcomings, we developed a Ladder of Seeps applied within new decision-assistance algorithms (Spock) to assist in seep exploration on the Costa Rica margin during the R/V Falkor 181210 cruise in December, 2018. This Ladder of Seeps [derived from analogous astrobiology criteria proposed by Neveu et al. (2018)] was used to help guide human and computer decision processes for ROV mission planning. The Ladder of Seeps provides a methodical query structure to identify what information is required to confirm a seep either: 1) supports seafloor life under extreme conditions, 2) supports that community with active seepage (possible fluid sample), or 3) taps fluids that reflect deep, subsurface geologic processes, but the top rung may be modified to address other scientific questions. Moreover, this framework allows us to identify higher likelihood seep targets based on existing incomplete or easily acquired data, including MBES (Multi-beam echo sounder) water column data. The Ladder of Seeps framework is based on information about the instruments used to collect seep information (e.g., are seeps detectable by the instrument with little chance of false positives?) and contextual criteria about the environment in which the data are collected (e.g., temporal variability of seep flux). Finally, the assembled data are considered in light of a Last-Resort interpretation, which is only satisfied once all other plausible data interpretations are excluded by observation. When coupled with decision-making algorithms that incorporate expert opinion with data acquired during the Costa Rica experiment, the Ladder of Seeps proved useful for identifying seeps with deep-sourced fluids, as evidenced by results of geochemistry analyses performed following the expedition.Support for this research was provided through NASA PSTAR Grant #NNX16AL08G and National Science Foundation Navigating the New Arctic grant #1839063. Use of the R/V Falkor and ROV SuBastian were provided through a grant from the Schmidt Ocean Institute. The AUG Nemesis and the Aurora in-situ mass spectrometer was provided through in-kind support from Teledyne Webb Research and Navistry Corp, respectively

CAD in mammography: lesion-level versus case-level analysis of the effects of prompts on human decisions

Object: To understand decision processes in CAD-supported breast screening by analysing how prompts affect readers’ judgements of individual mammographic features (lesions). To this end we analysed hitherto unexamined details of reports completed by mammogram readers in an earlier evaluation of a CAD tool. Material and methods: Assessments of lesions were extracted from 5,839 reports for 59 cancer cases. Statistical analyses of these data focused on what features readers considered when recalling a cancer case and how readers reacted to CAD prompts. Results: About 13.5% of recall decisions were found to be caused by responses to features other than those indicating actual cancer. Effects of CAD: lesions were more likely to be examined if prompted; the presence of a prompt on a cancer increased the probability of both detection and recall especially for less accurate readers in subtler cases; lack of prompts made cancer features less likely to be detected; false prompts made non-cancer features more likely to be classified as cancer. Conclusion: The apparent lack of impact reported for CAD in some studies is plausibly due to CAD systematically affecting readers’ identification of individual features, in a beneficial way for certain combinations of readers and features and a damaging way for others. Mammogram readers do not ignore prompts. Methodologically, assessing CAD by numbers of recalled cancer cases may be misleading

Health, Wellbeing, and Social Interaction: An International and Demographic Analysis of Perceived Life Changes and the Positives and Negatives of the COVID-19 Lockdown

Research suggests that people’s experiences of COVID-19 lockdowns have been detrimental to their lives and wellbeing. The current research compared the experiences and perceptions on health, wellbeing and social interaction of 300 UK adults and 450 adults in California. Individuals reported whether aspects of their life had changed for the better, worse, or not at all during lockdown in April 2020, and what the “best” and “worst” things about lockdown were. There were more similarities than differences in the regional comparison of perceptions of changes in specific aspects of ‘health and wellbeing’ and ‘social interaction’. Both regions reported the same number and nature of best and worst things about lockdown. Overarching themes of ‘health, self and wellbeing’, ‘being with others’, and ‘concerns with daily living’ were identified. Although reports of life changes and the positives and negatives of lockdown were similar across different demographic groups, some differences were present by age, sex, relationship, and family-status. Incorporating knowledge of unified and positive experiences of lockdown can be useful in informing future lockdown restrictions and supporting the population when restrictions are lifted

Health, Wellbeing, and Social Interaction: An International and Demographic Analysis of Perceived Life Changes and the Positives and Negatives of the COVID-19 Lockdown

Research suggests that people’s experiences of COVID-19 lockdowns have been detrimental to their lives and wellbeing. The current research compared the experiences and perceptions on health, wellbeing and social interaction of 300 UK adults and 450 adults in California. Individuals reported whether aspects of their life had changed for the better, worse, or not at all during lockdown in April 2020, and what the “best” and “worst” things about lockdown were. There were more similarities than differences in the regional comparison of perceptions of changes in specific aspects of ‘health and wellbeing’ and ‘social interaction’. Both regions reported the same number and nature of best and worst things about lockdown. Overarching themes of ‘health, self and wellbeing’, ‘being with others’, and ‘concerns with daily living’ were identified. Although reports of life changes and the positives and negatives of lockdown were similar across different demographic groups, some differences were present by age, sex, relationship, and family-status. Incorporating knowledge of unified and positive experiences of lockdown can be useful in informing future lockdown restrictions and supporting the population when restrictions are lifted