Why Should Natural Principles Be Simple?

Philosophia - One of the criteria to a strong principle in natural sciences is simplicity. The conventional view holds that the world is provided with natural laws that must be simple. This...     

Transfer of conditioned fear and avoidance: Concurrent measurement of arousal and operant responding

A reversal design was employed for the analysis of transfer of fear and avoidance through equivalence classes. Two 5-member equivalence classes (A1-B1-C1-D1-E1 and A2-B2-C2-D2-E2) were established. Then B1 and C1 were paired with shock (CS+) and served as S^Ds in avoidance training (B2 and C2 were trained as CS-/S^∆s for avoidance). Further avoidance training followed with D1 and E1 (as S^Ds) and D2 and E2 (as S^∆s), with the first presentation of each of these stimuli serving as the first transfer test. Afterwards, aversive conditioning contingencies were reversed: B2 and D2 were paired with shock and trained as S^Ds for avoidance, B1 and D1 were presented without shock (CS-/S^∆s). Transfer was tested again with C1, E1, C2 and E2. This reversal was implemented to allow for the within-subject replication of transfer effects upon changes in the function of only a subset of each class's elements. Avoidance (key presses) and conditioned fear (skin conductance and heart rate) were simultaneously measured. Results show a clear transfer effect for avoidance, with between- and within-subject replications. For physiological measures, transfer effects in the first test could only be imputed on the basis of group-based inferential statistical analysis. Evidence for between-subject replication was weaker, with only a limited proportion of participants meeting the individual criterion for transfer.     

Knowledge and Justice: A Comment

ABSTRACT

Epistemic justice projects are now one of the most important sites of science studies scholarship and engagement. The papers in this collection make clear that we divorce science and technology from questions of power at our peril, if we are to understand what generates and remediates the inequalities that past and extant knowledge creation and distribution systems have wrought. Expertise and experts are the conceptual anchors for these articles, and they offer quite different perspectives on whether expertise and counter-expertise are the terrain on which epistemic justice struggles ought to be fought. Some challenge older conceptualizations of expertise as narrow and specific, providing new evidence and frameworks for treating epistemes that are heterogeneous and boundary-crossing as means to justice; others demonstrate that acting on concerns as purely technical matters can provide strategic advantages; and others make clear that formally trained experts are neither welcome nor visible in technopolitical justice struggles. Reflected in the innovative approaches that the papers take, a second major contribution of the collection is to show why inclusion is itself a just goal, and a means to uncovering stories of injustice, technical innovations, and visions of the future that can offer new pathways to justice. The collection inspires new directions in sts, including which stories, and by whom, matter and why, and how attention to innovation can be balanced with attention to the extant, and to history.     

The missing link between faces and names: Evidence from Alzheimer's disease patients

Retrieval of proper names is a cause of concern and complaint among elderly adults and it is an early symptom of patients suffering from neurodegenerative diseases such as Alzheimer's disease (AD). While it is well established that AD patients have deficits of proper name retrieval, the nature of such impairment is not yet fully understood. Specifically, it is unknown whether this deficit is due to a degradation of the links between faces and proper names, or due to deficits in intentionally accessing and retrieving proper names from faces. Here, we aim to investigate the integrity of the links between famous faces and proper names in AD while minimizing the impact of the explicit retrieval. We compare the performances of AD patients and elderly controls in a face-name priming task. We assess the integrity of the link between faces and names at two different levels: identity level - the name and face belong to the same person; and semantic level - the name and face belong to the same category (e.g., politicians). Our results reveal that AD patients compared with controls show intact semantic priming but reduced priming for person identity. This suggests that the deficits in intentionally retrieving proper names in AD are the result of a partial disruption of the network at the identity level, i.e., the links between known faces and proper names.     

Understanding Suicide in Socially Vulnerable Contexts: Psychological Autopsy in a Small Town in Mexico

In Mexico, suicides are increasing in certain latitudes where local rates have grown to levels of alert; suicide is also the second most common cause of death for the group aged 15 to 19. The psychological autopsy method was utilized to uncover and analyze common factors in all of the registered suicides within 2011 and 2012 in a small town of the state of Guanajuato, located in the center of Mexico. A total of nine decedents were analyzed, and 22 interviews were conducted. The most salient factors were as follows: poverty, financial stress, substance abuse, low levels of education, conflictive relationships, and a poor handling of emotions. The concepts of social exclusion and vulnerability were employed to analyze suicides as symptoms of a much deeper problem of this country, suggesting that anomie and social malady are nowadays important suicidal factors, mostly for children and young people.