A reexamination of mental arithmetic models and data: A reply to Ashcraft

In a review of the chronometric literature, M. Ashcraft (1982, Developmental Review, 2, 213–236) concludes that adults store each basic arithmetic fact in a table-like retrieval network. In my commentary (1983, Developmental Review, 3, 225–230), I argued that procedural knowledge (stored rules, principles, or heuristics) might be a cognitively more economical basis for generating many number combinations. In this paper, I draw an analogy between this alternative model of number fact representation and how computers efficiently reconstruct arithmetic combinations, note that the research findings do not clearly support any one model of mental arithmetic, and attempt to address Ashcraft's (1983, Developmental Review, 3, 231–235) criticisms of my model.     

Response to Ranganathan

This essay responds to Bharat Ranganathan's “Comment” on my essay, “The Concept of Dignity in the Universal Declaration of Human Rights” (2011). Addressing key criticisms in this “Comment,” I make the following points. First, neither the idea of inherent dignity being “imparted” to humans, nor the Universal Declaration's implication—through its use of terms such as “inherent” and “inalienable”—that humans participate in transcendent reality, necessarily presuppose a Christian metaphysics. Second, a concept such as “inherent dignity” must be affirmed to be intrinsically heuristic unless we are to assume that its meaning can be completely known within the conditions of existence; but this affirmation does not render such concepts “indeterminate of sense.” Finally, Ranganathan's distinction between“weak” and “strong” senses of transcendence is untenable. If human truths beyond all contingencies are knowable (“weak” transcendence), then there must be a real dimension of meaning that transcends all contingencies (“strong” transcendence).     

The Holland Code of Members of the National Organization for Human Services: A Preliminary Study of Human Services Professionals

This study determined the Holland code of members of the National Organization for Human Services. The authors used the O*NET Interest Profiler–Short Form to find that a sample of 355 human services professionals had a Holland code of Social Artistic, with Investigative, Enterprising, and Conventional codes significantly lower than Artisitc. Demographic differences were not found based on gender, whether participants identified human services as their primary field, or whether they had formal education in human services. Slight differences based on age were noted. Results will be used to advocate for inclusion of “human services professional” in the Standard Occupational Classification system.     

Virtual reality is more efficient in learning human heart anatomy especially for subjects with low baseline knowledge

New technologies make their way into education and one of the most prominent of them is the immersive Virtual Reality (IVR). But the scientific data about its efficiency in the educational process is controversial. In the present study three randomized groups of students, who did not have biological and medical classes amongst their courses, studied human heart anatomy using three different learning methods – a paper (text and images); a 3D interactive human heart model presented on a computer display; an IVR human heart model. Prior and after learning session students performed the test of human heart anatomy with 28 open questions. The IVR group showed the increase of correct answers within the group and compared with other groups. Also, the subjects with lesser baseline knowledge in IVR group showed the greater increase of correct answers following IVR session. The structure and the way how the learning material should be presented in IVR and how it affects the learning outcomes are discussed.     

Visual contribution to human standing balance during support surface tilts

Visual position and velocity cues improve human standing balance, reducing sway responses to external disturbances and sway variability. Previous work suggested that human balancing is based on sensory estimates of external disturbances and their compensation using feedback mechanisms (Disturbance Estimation and Compensation, DEC model). This study investigates the visual effects on sway responses to pseudo-random support surface tilts, assuming that improvements result from lowering the velocity threshold in a tilt estimate and the position threshold in an estimate of the gravity disturbance. Center of mass (COM) sway was measured with four different tilt amplitudes, separating the effect of visual cues across the conditions ‘Eyes closed’ (no visual cues), ‘4 Hz stroboscopic illumination’ (visual position cues), and ‘continuous illumination’ (visual position and velocity cues). In a model based approach, parameters of disturbance estimators were identified. The model reproduced experimental results and showed a specific reduction of the position and velocity threshold when adding visual position and velocity cues, respectively. Sway variability was analyzed to explore a hypothesized relation between estimator thresholds and internal noise. Results suggest that adding the visual cues reduces the contribution of vestibular noise, thereby reducing sway variability and allowing for lower thresholds, which improves the disturbance compensation.     

Window view of nature after brief exercise improves choice reaction time and heart rate restoration

Research indicates that natural environments induce restorative effects on cognitive capacity and autonomic arousal. The present study investigates differences in choice reaction time (CRT) and heart rate responses in students (n = 9) resting with or without a window view of a modest natural environment after a physical exertion. Subjects performed a CRT-task before pedaling a spinning bike, followed by resting in a chair with either a window view of a natural environment, or no view. Heart rate was obtained during the rest-period, and the CRT task was performed again immediately after resting.Results indicated that subjects elicited significantly larger improvement in CRTs and more efficient heart rate restoration after resting with a window view, compared to resting without a view. Resting with a modest view of a natural environment after brief exercise demonstrated both a greater effect of cognitive enhancement and more efficient physiological restoration compared to resting without a view. These findings advance prior research by demonstrating both cognitive and physiological benefits from resting in a modest natural environment.     

Face recognition algorithms and the other‐race effect: computational mechanisms for a developmental contact hypothesis

People recognize faces of their own race more accurately than faces of other races. The “contact” hypothesis suggests that this “other‐race effect” occurs as a result of the greater experience we have with own‐ versus other‐race faces. The computational mechanisms that may underlie different versions of the contact hypothesis were explored in this study. We replicated the other‐race effect with human participants and evaluated four classes of computational face recognition algorithms for the presence of an other‐race effect. Consistent with the predictions of a developmental contact hypothesis, “experience‐based models” demonstrated an other‐race effect only when the representational system was developed through experience that warped the perceptual space in a way that was sensitive to the overall structure of the model's experience with faces of different races. When the model's representation relied on a feature set optimized to encode the information in the learned faces, experience‐based algorithms recognized minority‐race faces more accurately than majority‐race faces. The results suggest a developmental learning process that warps the perceptual space to enhance the encoding of distinctions relevant for own‐race faces. This feature space limits the quality of face representations for other‐race faces.     

Understanding Miscommunication: Speech Act Recognition in Digital Contexts

Successful language use requires accurate intention recognition. However, sometimes this can be undermined because communication occurs within an interpersonal context. In this research, I used a relatively large set of speech acts (n = 32) and explored how variability in their inherent face-threat influences the extent to which they are successfully recognized by a recipient, as well as the confidence of senders and receivers in their communicative success. Participants in two experiments either created text messages (senders) designed to perform a specific speech act (e.g., agree) or interpreted those text messages (receivers) in terms of the specific speech act being performed. The speech acts were scaled in terms of their degree of face threat. In both experiments, speech acts that were more threatening were less likely to be correctly recognized than those that were less threatening. Additionally, the messages of the more threatening speech acts were longer and lower in clout than the less threatening speech acts. Senders displayed greater confidence in communicative success than receivers, but judgments of communicative success (for both senders and receivers) were unrelated to actual communicative success. The implications of these results for our understanding of actual communicative episodes are discussed.     

Repair Avoidance: When Faithful Informational Exchanges Don't Matter That Much

Common-sense intuition suggests that, when people are engaged in informational exchanges, they communicate so as to be reasonably sure that they perform the exchanges faithfully. Over the years, we have found evidence suggesting that this intuition, which is woven into several influential theories of human communication, may be misleading. We first summarize this evidence and discuss its potential limitations. Then, we present a new study that addresses the potential limitations. A confederate instructed participants to “pick up the skask” from a tray containing six objects and move it to a specific location. Since skask is a non-word invented by us, participants had to ask for clarification to perform the instruction faithfully. In contradiction with the intuition that people pursue faithfulness when engaged in informational exchanges, 29 of the 48 participants we tested performed the instruction without asking for clarification. We identified a possible cause for this behavior, which occurred more frequently when avoiding the clarification was unlikely to result in an overt consequence (an error in the execution of the instruction that could be noticed by the confederate or the experimenter). Other factors such as individual differences and the specific interpersonal dynamics of the experimental settings, if they played a role at all, did it to an extent that is unlikely to be comparable to that of the role played by overt consequences. Considered together, our various assessments of the extent to which people engage in faithful informational exchanges converge on a simple conclusion: Communicating faithfully is a substantially demanding task, and people often fail at it. We discuss the implications of this conclusion and speculate on its relevance for understanding the evolutionary past of human communication.     

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.