Olp: An R package for optimal linear partitions of finite sets of points on the plane

Given a set of points on the plane and an assignment of values to them, an optimal linear partition is a division of the set into two subsets which are separated by a straight line and maximally contrast with each other in the values assigned to their points. We present a method for inspecting and rating all linear partitions of a finite set, and a package of three functions in the R language for executing the computations. One function is for finding the optimal linear partitions and corresponding separating lines, another for graphically representing the results, and a third for testing how well the data comply with the linear separability condition. We illustrate the method on possible data from a psychophysical experiment (concerning the size–weight illusion) and compare its performance with that of linear discriminant analysis and multiple logistic regression, adapted to dividing linearly a set of points on the plane.     

Ambivalence and Self‐Deception: Reframing the Debate

A multitude of scholars have recently argued that inherently ambivalent reactions ought to be accepted, and our drive toward overcoming them resisted, in order to preserve a reflectively accurate account of oneself. By contrast, I argue that a genuine commitment to overcome ambivalence aims less at avoiding than acknowledging and understanding, as well as possibly resolving, whatever conflicts led us to become ambivalent in the first place. On the other hand, certain forms of ‘reflective ambivalence’ are especially vulnerable to the very kind of self‐deception they aim to prevent.     

New protocol for dissociating visuospatial working memory ability in reaching space and in navigational space

Several studies have demonstrated that the processing of visuospatial memory for locations in reaching space and in navigational space is supported by independent systems, and that the coding of visuospatial information depends on the modality of the presentation (i.e., sequential or simultaneous). However, these lines of evidence and the most common neuropsychological tests used by clinicians to investigate visuospatial memory have several limitations (e.g., they are unable to analyze all the subcomponents of this function and are not directly comparable). Therefore, we developed a new battery of tests that is able to investigate these subcomponents. We recruited 71 healthy subjects who underwent sequential and simultaneous navigational tests by using an innovative sensorized platform, as well as comparable paper tests to evaluate the same components in reaching space (Exp. 1). Consistent with the literature, the principal-component method of analysis used in this study demonstrated the presence of distinct memory for sequences in different portions of space, but no distinction was found for simultaneous presentation, suggesting that different modalities of eye gaze exploration are used when subjects have to perform different types of tasks. For this purpose, an infrared Tobii Eye-Tracking X50 system was used in both spatial conditions (Exp. 2), showing that a clear effect of the presentation modality was due to the specific strategy used by subjects to explore the stimuli in space. Given these findings, the neuropsychological battery established in the present study allows us to show basic differences in the normal coding of stimuli, which can explain the specific visuospatial deficits found in various neurological conditions.     

In search of the Human: The trauma of modernity and the “instrumental reason” of the persecutors

Abstract

This article takes the clinical notion of trauma as a historiographic criterion for understanding modernity and its mythologies. If the rewriting of the term trauma – at the intersection of psychoanalysis and neurobiology, cultural anthropology and philosophy of the mind – is the hallmark of contemporaneity, it is quite acceptable to see the Shoah as a radical historical and epistemological watershed. Never before had such a highly productive bureaucratic-industrial system been designed and implemented for the devastation of the very idea of humanity. Auschwitz was, in the most radical ways, the liminal space between Human and Inhuman. It lay right at the cutting edge of the abyss that the executioner shares with his victim – the annihilation of humanity. This essay crosses a question that has always characterized the social construction of subjectivity: the perimeter of the Human, and the interrelationships between identity, alterity, and recognition.