Generalizing the dynamic field theory of spatial cognition across real and developmental time scales

Within cognitive neuroscience, computational models are designed to provide insights into the organization of behavior while adhering to neural principles. These models should provide sufficient specificity to generate novel predictions while maintaining the generality needed to capture behavior across tasks and/or time scales. This paper presents one such model, the Dynamic Field Theory (DFT) of spatial cognition, showing new simulations that provide a demonstration proof that the theory generalizes across developmental changes in performance in four tasks—the Piagetian A-not-B task, a sandbox version of the A-not-B task, a canonical spatial recall task, and a position discrimination task. Model simulations demonstrate that the DFT can accomplish both specificity—generating novel, testable predictions—and generality—spanning multiple tasks across development with a relatively simple developmental hypothesis. Critically, the DFT achieves generality across tasks and time scales with no modification to its basic structure and with a strong commitment to neural principles. The only change necessary to capture development in the model was an increase in the precision of the tuning of receptive fields as well as an increase in the precision of local excitatory interactions among neurons in the model. These small quantitative changes were sufficient to move the model through a set of quantitative and qualitative behavioral changes that span the age range from 8 months to 6 years and into adulthood. We conclude by considering how the DFT is positioned in the literature, the challenges on the horizon for our framework, and how a dynamic field approach can yield new insights into development from a computational cognitive neuroscience perspective

A treatise on language methods and language-games in autism

Although it is generally understood that autism is a developmental disability affecting social learning, my social constructionist perspective suggested to me that, strangely, current theories aimed at explaining the nature of autism appeared not to fully reflect the essential social aspects of autism. Given that typically developing human beings become fully socialised through learning a first language, it appeared to me that autism research has, especially of late, failed to give sufficient attention to language despite Kanner’s advice. In researching this thesis I have sought to make a contribution to knowledge of my subject by: (1) developing a synthesis of current knowledge of autistic language methods as a practical framework to guide future research focused on language in autism; (2) critiquing ‘established’ autism theory; (3) drawing attention to Ludwig Wittgenstein’s neglected contributions to the philosophy of mind; and (4) reviewing the contribution of ‘alternative’ theory, including Wittgenstein’s criteriological theory, to an understanding of autism. My research has involved reviewing: (a) the literature on autistic language methods; (b)Conversation Analysis of autistic conversation; (c) narrative writing by authors diagnosed or retrospectively diagnosed with autism; and (d) existing autism theory. I conclude that there are specific features of talk and writing that reflect autism with some features of autistic writing being a ‘mirror image’ of features of autistic talk. A further, important, conclusion is that there are strengths as well as weaknesses associated with autistic talk and writing i.e., from a linguistic stance, it is wrong to regard autism as a disability; rather, it involves a different way of communicating – both verbally and in writing – than is seen in typically developing people. I also conclude that alternative theory has much to contribute to an understanding of autism, and that the atypical nature of autistic social development results in autistic people failing to fully come to terms with language-games

Upper limb proprioceptive sensitivity in three-dimensional space: effects of direction, posture, and exogenous neuromodulation

abstract: Proprioception is the sense of body position, movement, force, and effort. Loss of proprioception can affect planning and control of limb and body movements, negatively impacting activities of daily living and quality of life. Assessments employing planar robots have shown that proprioceptive sensitivity is directionally dependent within the horizontal plane however, few studies have looked at proprioceptive sensitivity in 3d space. In addition, the extent to which proprioceptive sensitivity is modifiable by factors such as exogenous neuromodulation is unclear. To investigate proprioceptive sensitivity in 3d we developed a novel experimental paradigm employing a 7-DoF robot arm, which enables reliable testing of arm proprioception along arbitrary paths in 3d space, including vertical motion which has previously been neglected. A participant’s right arm was coupled to a trough held by the robot that stabilized the wrist and forearm, allowing for changes in configuration only at the elbow and shoulder. Sensitivity to imposed displacements of the endpoint of the arm were evaluated using a “same/different” task, where participant’s hands were moved 1-4 cm from a previously visited reference position. A measure of sensitivity (d’) was compared across 6 movement directions and between 2 postures. For all directions, sensitivity increased monotonically as the distance from the reference location increased. Sensitivity was also shown to be anisotropic (directionally dependent) which has implications for our understanding of the planning and control of reaching movements in 3d space. The effect of neuromodulation on proprioceptive sensitivity was assessed using transcutaneous electrical nerve stimulation (TENS), which has been shown to have beneficial effects on human cognitive and sensorimotor performance in other contexts. In this pilot study the effects of two frequencies (30hz and 300hz) and three electrode configurations were examined. No effect of electrode configuration was found, however sensitivity with 30hz stimulation was significantly lower than with 300hz stimulation (which was similar to sensitivity without stimulation). Although TENS was shown to modulate proprioceptive sensitivity, additional experiments are required to determine if TENS can produce enhancement rather than depression of sensitivity which would have positive implications for rehabilitation of proprioceptive deficits arising from stroke and other disorders.Dissertation/ThesisDoctoral Dissertation Neuroscience 201

Engineering data compendium. Human perception and performance. User's guide

The concept underlying the Engineering Data Compendium was the product of a research and development program (Integrated Perceptual Information for Designers project) aimed at facilitating the application of basic research findings in human performance to the design and military crew systems. The principal objective was to develop a workable strategy for: (1) identifying and distilling information of potential value to system design from the existing research literature, and (2) presenting this technical information in a way that would aid its accessibility, interpretability, and applicability by systems designers. The present four volumes of the Engineering Data Compendium represent the first implementation of this strategy. This is the first volume, the User's Guide, containing a description of the program and instructions for its use

Grounding the Linking Competence in Culture and Nature. How Action and Perception Shape the Syntax-Semantics Relationship

Part I of the book presents my basic assumptions about the syntax-semantics relationship as a competence of language users and compares them with those of the two paradigms that presently account for most theoretical linguistic projects, studies, and publications. I refer to them as Chomskyan Linguistics and Cognitive-Functional Linguistics. I will show that these approaches do not provide the means to accommodate the sociocultural origins of the “linking” competence, creating the need for an alternative approach. While considering these two approaches (sections 2.1 and 2.3), an alternative proposal will be sketched in section 2.2, using the notion of “research programme”. Thus, part I deals mainly with questions of the philosophy of science. Nevertheless, the model underlying the research programme gives structure to the procedure followed throughout the rest of the book, since it identifies the undertaking as multidisciplinary, following from the central roles of perception and action/attribution. This means that approaching the competence of relating form to content as characterized above requires looking into these sub-competences first, since the former draws upon the latter. Part I concludes with the formulation of an action-theoretic vocabulary and taxonomy (section 2.4). This vocabulary serves as the guideline for how to talk about the subject-matter of each of these disciplines. Part II and chapter 3 then deal with the sub-competences that have been identified as underlying linguistic competence. They concern the use of perception, identification/categorization, conceptualization, action, attribution, and the use of linguistic symbols. Section 3.1 in part II deals with perception. In particular, two crucial properties of perception will be discussed: that it consists of a bottom-up part and a top-down part, and that the output of perception is underspecified in the sense that what we perceive is not informative with respect to actional, i.e., socially relevant matters. The sections on perception to some degree anticipate the characterization of conceptualization in section 3.2 because the latter will be reconstructed as simulated perception. The property of underspecification is thus sustained in conceptualization, too. If utterances encode concepts and concepts are underspecified with respect to those matters that are most important for everyday interaction, one wonders how verbal interaction can (actually) be successful. Here is where action competence and attribution come into play (the non-conceptual contents referred to above). I will show that native speakers act and cognize according to particular socio-cognitive parameters, on the basis of which they make socially relevant attributions. These in turn specify what was underspecified about concepts beforehand. In other words, actional knowledge including attribution must complement concepts in order to count as the semantics underlying linguistic utterances. Sections 3.3 and 3.4 develop a descriptive means for semantic contents. I present the inherent structural organization of concepts and demonstrate how the spatial and temporal aspects of conceptualization can be systematically related to the syntactic structures underlying utterances. In particular, I will argue that conceptualization is organized by means of trajector-landmark configurations which can quite regularly be related to parts of speech in syntactic constructions using the notion of diagrammatic iconicity. Given a diagrammatic mapping and conceptualization as simulated perception the utterance thus becomes something like an instruction to simulate a perception. In part III, section 4.1 deals with the question of what the formal constituents of utterances/constructions contribute to the building of a concept from an utterance. In this context a theory of the German dative is presented, based on the theoretical notions developed throughout this work. Section 4.2 sketches the non-formal properties that reduce the remaining underspecification. In this context one of the most fundamental cognitive properties of language users is uncovered, namely their need to find the cause of any event they are cognizing about. I will then outline the consequences of this property for language production and comprehension. Section 4.3 lists the most important linking schemas for German on the basis of the most important constructions, i.e., motivated conceptualization-syntactic construction mappings, and then describes in a step-by-step manner how – from the utterance-as-instruction-for-conceptualization perspective – such an instruction is obeyed, and how such an instruction is built up from the perception of an event, respectively. The last section, 4.4, is dedicated to a discussion of some of the most famous and most puzzling linguistic phenomena which theoretical linguists traditionally deal with. In discussing the formal aspects of the linguistic competence, examples from German are used

Spatial memories in place recognition

Die Dissertation untersucht die Rolle von Raumgedächtnissen in der Ortserkennung. Die erste Studie fokussiert sich auf das Zusammenspiel zwischen dem räumlichen Arbeitsgedächtnis und der Ortskodierung im Langzeitgedächtnis. Die zweite Studie adressiert die Frage, ob der Abruf von zeitlichem Kontext aus dem episodischen Gedächtnis, der entscheidend für die Integration von vielfachen Ansichten in der Ortserkennung ist, ein charakteristisches Ereignis-korreliertes Potential hervorruft

Mitigating Sunk Cost Bias for Consumers: Considering Alternatives Within High and Low Construal Levels When Costs are Sunk

Abstract This paper explores how sunk costs increase consumers’ vulnerability to fraud and explores possible intervention strategies. Sunk cost bias occurs when individuals persist in an activity due to past investments (Arkes & Blumer, 1985). Outcome salience, framing, and alternatives can help alleviate loss aversion and persistence when costs are sunk (Stewart, Chater, Stott, & Reimers, 2003; Van Schie & Van Der Pligt, 1995). Option evaluation is influenced by an individual’s construal level (Ding & Keh, 2017; Henderson, 2013; Sun, Keh, & Lee, 2019). Construal level theory (CL) describes the impact of psychological distance on thinking– with greater distance thinking is more abstract (high CL), with less distance thinking is more concrete (low CL) (Trope & Liberman, 2010). Individuals in a high construal mindset could be more likely to consider conceptual alternatives, like not purchasing a home, while individuals in a low construal mindset could be more likely to consider pursing a different loan, if they know they have preapproval from other lenders. Five studies investigated 1) sunk costs in fraudulent scenarios 2) the influence of construal level on sunk costs, 3) the influence of construal level on the evaluation of similar or general alternative options, 4) whether the presence of alternatives alleviate persistence when costs are sunk, and 5) whether the relationship between the presence of alternatives and persistence is mediated by the perceived feasibility of exploring other options. If effective, option salience can inform consumer protection efforts