Comment on “Visual layout modulates Fitts’s law: The importance of first and last positions”

Pratt, Adam, and Fischer (2007) investigated the effect of surrounding targets on the time it took to move to an individual target and found that the movement time to a central target was above the Fitts’s law line related to the first and last targets. They explained their results in terms of a “visuomotor hypothesis.” Here, an alternative explanation is given in terms of a previously validated model of the “available target width” that is determined by the size of the target and the width of the finger pad that is being used to hit the target.     

Metacognitive control of action: Preparation for aiming reflects knowledge of Fitts’s law

Metacognitive control has been studied in intellectual skills but has not yet been studied in perceptual-motor skills. To probe metacognitive control in a perceptual-motor context, we developed a task in which participants chose the position of a cursor relative to two targets. One of the two targets was randomly erased. Participants tried to move the cursor into the remaining target within a limited amount of time. The target widths were varied, making the difficulty of moving to either target dependent on the chosen cursor position. Predictions were based on the assumption that participants could use an analogue of Fitts’s law to choose optimal positions. The fit between observed and predicted positions was excellent, suggesting that participants used information about movement speed-accuracy trade-offs to guide movement preparation. The findings suggest that metacognition applies to both perceptual-motor skills and intellectual skills, and that these two domains are more similar than traditionally assumed.     

Unification of psychophysical phenomena: The complete form of Fechner’s law

Many of the laws and empirical observations of fundamental psychophysics can be unified with a single equation, which has been called the complete form of Fechner’s law. It can be shown that this law embraces both of the commonly used forms: Stevens’s and Fechner’s laws. It assumes one or the other form with appropriate values of the parameters. However, the complete equation confers an advantage beyond simply containing the classical laws. It offers greater flexibility in the representation of experimental data. It is shown that psychophysical phenomena may be represented by any number of triplets of quantities: subjective magnitude of stimulus, subjective just noticeable difference (jnd), and differential threshold. Each of the preceding quantities are functions of the physical magnitude of the stimulus. The investigator has the license to choose two of these quantities in the form he or she thinks is best; the third quantity is determined by the choice of the first two. Thus, for example, different forms of the law of sensation and different forms of the mathematical function for differential threshold may coexist with equal validity.     

Linear representation of temporal location and Stevens’s law

Ss were asked to indicate points 1 week, 7 months, 3 years, and 9 years in the past and future on two time lines representing birth to present and present to death. Data for 90 college-age Ss fit a psychophysical power function following Stevens’s law. with negatively accelerated growth indicating proportionately greater linear representation of periods nearer to the present. Variability was greater for the representations of the future than of the past, with monotonic increases in variability as distance from the present increased.     

The importance of working memory updating in the Prisoner’s dilemma

Successful cooperation requires that humans can flexibly adjust choices to their partner’s behaviour. This, in turn, presupposes a representation of a partner’s past decisions in working memory. The aim of the current study was to investigate the role of working memory processes in cooperation. For that purpose, we tested the effects of working memory updating (Experiment 1) and working memory maintenance demands (Experiments 2 and 3) on cooperative behaviour in the Prisoner’s dilemma game. We found that demands on updating, but not maintenance, of working memory contents impaired strategy use in the Prisoner’s dilemma. Thus, our data show that updating a partner’s past behaviour in working memory represents an important precondition for strategy use in cooperation.     

The latency of response in relation to Bloch’s law at threshold’

Bloch’s law failed to hold for latencies of response in a threshold experiment where frequencies ofresponse did, nevertheless, obey the law. Dark-adapted Ss were instructed to respond as soon as they detected flashes of various luminances and durations. The frequency of response increased with increases in stimulus energy (luminance times duration); it was constant when energy was constant. The latency of response, measured from stimulus onset. varied inversely with energy; it also varied inversely with the luminance of flashes that were constant in energy. The results were consistent with data from earlier threshold and simple reaction time experiments.     

The relative importance of patients’ decisional control preferences and experiences

Objective: Patients’ role in treatment decision-making can influence psychosocial and health-related outcomes (i.e. satisfaction, felt respect, adherence). We examined decisional control in a surgical context, identifying correlates of patients’ preferences and experiences.

Design: 380 patients and 7 surgeons were surveyed during initial surgical consultation visits in a low-income outpatient clinic.

Measures: Patients reported preferences for (pre-consultation) and experiences of (post-consultation) decisional control, demographics, satisfaction with care, and adherence to treatment recommendations. Surgeons rated patients’ health status.

Results: Preferences for and experiences of decisional control were unrelated, suggesting significant preference–experience misalignment. However, this misalignment did not appear to be consequential for patient outcomes. Rather, more decisional control, regardless of patients’ preferences, predicted greater satisfaction with care and greater self-reported adherence as assessed at a post-surgical appointment.

Conclusions: Decisional control predicts better outcomes for patients, regardless of their preferences for control over treatment decisions. These findings suggest that interventions should aim to increase patients’ degree of decisional control when feasible and appropriate.     

Pitch strength and Stevens’s power law

Recent studies have suggested that the saliency or the strength of pitch of complex sounds can be accounted for on the basis of the temporal properties in the stimulus waveform as measured by the height of the first peak in the waveform autocorrelation function. We used a scaling procedure to measure the pitch strength from 15 listeners for four different pitches of complex sounds in which the height of the first peak in the autocorrelation function systematically varied. Pitch strength judgments were evaluated in terms of a modification of Stevens’s power law in which temporal information was used from both the waveform fine structure and the envelope. Best fits of this modified power law to the judged pitch strengths indicate that the exponent in Stevens’s power law is greater than 1. The results suggest that pitch strength is primarily determined by the waveform fine structure, but the stimulus envelope can also contribute to the pitch strength.     

The concept of Lichnost’ in criminal law theory, 1860s–1900s

This essay discusses criminal law theories in late Imperial Russia. It argues that, although the political climate of Reform and Counter Reform effectively undermined attempts to implement new legislation premised on the idea of the ‘rights-enabled person’ (pravovaya lichnost’), paradoxically, it fostered the growth of juridical scholarship. Russian criminal law theorists engaged critically with Western juridical science, which, beginning in the 1870s, witnessed a shift away from absolutist theories inspired by the classics of philosophical idealism towards various strains of positivism arguing for the restoration of the person as a concrete, physiological being. However, while Russian scholars were drawn to these new trends of criminal anthropology and the sociology of crime, they were also obliged to take stock of an indigenous legal culture that scarcely differentiated between pravo and zakon, together with a long tradition of customary practices that equated crime and punishment with sin and redemption.     

Mandela’s “Force of law”

In “Force of Law: The ‘Mystical Foundation of Authority’,” Jacques Derrida argues that the law’s authority is mystical, unattainable in its origins, theforce of law therefore precipitating conditions for its perpetual contest. The force of Derrida’s “Force of Law” is illustrated in his study of Nelson Mandela (“The Laws of Reflection: Nelson Mandela, In Admiration”). Derrida’s Mandela reflects the law’s divisibility, and therefore its iterability in representation beyond the force of its founding letter—of which apartheid was an extreme example. Mandela makes visible the need for the law’s supplement, as performative justice in the face of inherent violence in the law’s conserving force. Mandela’s performativeforce of law, contesting the inaugural violence of law, is inseparable from an implicit warp and weft of historical and theological influences.     

Tooley’s account of the necessary connection between law and regularity

Fred Dretske, Michael Tooley, and David Armstrong accept a theory of governing laws of nature according to which laws are atomic states of affairs that necessitate corresponding natural regularities. Some philosophers object to the Dretske/Tooley/Armstrong theory on the grounds that there is no illuminating account of the necessary connection between governing law and natural regularity. In response, Michael Tooley has provided a reductive account of this necessary connection in his book Causation (1987). In this essay, I discuss an improved version of his account and argue that it fails. First, the account cannot be extended to explain the necessary connection between certain sorts of laws—namely, probabilistic laws and laws relating structural universals—and their corresponding regularities. Second, Tooley’s account succeeds only by (very subtly) incorporating primitive necessity elsewhere, so the problem of avoiding primitive necessity is merely relocated.     

The worthless remains of a physician’s calling: Max Weber,William Osler,and the last virtue of physicians

On the centenary of Max Weber’s “Science as a Vocation,” his essay still performs interpretative work. In it, Weber argues that the vocation of a scientist is to produce specialized, rationalized knowledge that will be superseded. Weber says this vocation is a rationalized version of the Protestant conception of calling or vocation (Beruf), tragically disenchanting the world and leaving the idea of calling as a worthless remains (caput mortuum). A similar trajectory can be seen in the physician William Osler’s writings, especially his essay “Internal Medicine as a Vocation,” in which the calling of a physician is described as both rational and noble. While Osler’s conception of the physician’s vocation has been formative for contemporary medicine, physicians are reporting burnout and leaving medical practice at escalating rates. As physicians abandon their noble vocations, an alternative conception of a physician’s vocation is needed. From the worthless remains of the physician’s rational and noble vocation, the labor of a physician can find grounding in humility.     

The limits of definition: Gadamer’s critique of Aristotle’s ethics

ABSTRACT

There is a recent scholarly trend drawing similarities between Aristotle’s conceptions of ethics and demonstrative science. One such similarity has become widely and rightly recognized: for Aristotle both ethics and demonstrative science seek essential definitions of phenomena. The task of the paper is to show that German philosopher and classicist Hans-Georg Gadamer not only prefigured this interpretative trend, he also identified a problematic feature of Aristotle’s method so construed. The problematic feature is semantic. For Aristotle essential definitions must consist of univocal terms, but such univocity cannot be maintained if the definienda and definientes are concepts to be usefully employed in everyday ethical judgements. Gadamer therefore points out a problematic tension in Aristotle’s ethics. On the one hand, ethical inquiry should have practical application, but, on the other hand, the semantic assumptions underlying inquiry imply that it cannot.     

The political theology of Fichte’s Staatslehre: immanence and transcendence

Given its use of religious concepts and language, it is tempting to class Fichte’s rarely discussed Staatslehre as a political theology. I argue that the Staatslehre can be classed as a political theology because of the way in which it can be understood in terms of the concepts of immanence and transcendence. The concept of immanence applies to Fichte’s account of history in particular. Fichte himself allows for a moment of transcendence at the very beginning of history. I argue that the concept of transcendence is also implicit in the Staatslehre in relation to some problems faced by Fichte’s own account of the role of the Zwingherr in the historical development and actualization of right and moral freedom, despite his attempt to avoid introducing theologically based explanations of political concepts at this stage of his Staatslehre.     

Visual imagery: The past and future as seen by patients with Alzheimer’s disease

We investigated visual imagery for past and future thinking in Alzheimer’s Disease (AD). We invited AD patients and controls to retrieve past events and to imagine future events. Participants also provided a “Field” response if they see the event through their own eyes, or an “Observer” response if they see themselves in the scene as a spectator would. Less “Field” and more “Observer” responses were observed in AD participants than in controls during past and future thinking, suggesting a diminished ability to mentally visualize past and future events in AD. Results also demonstrated significant positive correlations between the production of “Field” responses and specificity during past and future thinking, suggesting a relationship between the ability to mentally visualize past and future events and autobiographical overgenerality in AD.     

The relative importance of perceptual information throughout the sections of a cricket ball’s trajectory

Ten experienced cricket players were tested for changes in the level of skilled performance brought about by accluding sections of the ball’s trajectory. Results indicated that performance is differentially affected, with the middle third section of the ball’s flight path being crucial in maintaining normal performance levels. Implications were that this section renders a particular type of information highly relevant to this task. Discussion centered around the possibility of task specificity, changes of strategy and the temporal constraints of the task.     

Enumeration of small collections violates Weber’s law

In a phenomenon called subitizing, we can immediately generate exact counts of small collections (one to three objects), in contrast to larger collections, for which we must either create rough estimates or serially count. A parsimonious explanation for this advantage for small collections is that noisy representations of small collections are more tolerable, due to the larger relative differences between consecutive numbers (e.g., 2 vs. 3 is a 50 % increase, but 10 vs. 11 is only a 10 % increase). In contrast, the advantage could stem from the fact that small-collection enumeration is more precise, relying on a unique mechanism. Here, we present two experiments that conclusively showed that the enumeration of small collections is indeed “superprecise.” Participants compared numerosity within either small or large visual collections in conditions in which the relative differences were controlled (e.g., performance for 2 vs. 3 was compared with performance for 20 vs. 30). Small-number comparison was still faster and more accurate, across both “more–fewer” judgments (Exp. 1), and “same–different” judgments (Exp. 2). We then reviewed the remaining potential mechanisms that might underlie this superprecision for small collections, including the greater diagnostic value of visual features that correlate with number and a limited capacity for visually individuating objects.