Naive observers viewed a sequence of colored Mondrian patterns, simulated on a color monitor. Each pattern was presented twice in succession, first under one daylight illuminant with a correlated color temperature of either 16,000 or 4,000 K and then under the other, to test for color constancy. The observers compared the central square of the pattern across illuminants, either rating it for sameness of material appearance or sameness of hue and saturation or judging an objective property—that is, whether its change (...) of color originated from a change in material or only from a change in illumination. Average color constancy indices were high for material appearance ratings and binary judgments of origin and low for hue–saturation ratings. Individuals’ performance varied, but judgments of material and of hue and saturation remained demarcated. Observers seem able to separate phenomenal percepts from their ontological projections of mental appearance onto physical phenomena; thus, even when a chromatic change alters perceived hue and saturation, observers can reliably infer the cause, the constancy of the underlying surface spectral reflectance. (shrink)

We show that true colors as defined by Chevreul (1839) produce unsuspected simultaneous brightness induction effects on their immediate grey backgrounds when these are placed on a darker (black) general background surrounding two spatially separated configurations. Assimilation and apparent contrast may occur in one and the same stimulus display. We examined the possible link between these effects and the perceived depth of the color patterns which induce them as a function of their luminance contrast. Patterns of square-shaped inducers of a (...) single color (red, green, blue, yellow, or grey) were placed on background fields of a lighter and a darker grey, presented on a darker screen. Inducers were always darker on one side of the display and brighter on the other in a given trial. The intensity of the grey backgrounds varied between trials only. This permitted generating four inducer luminance contrasts, presented in random order, for each color. Background fields were either spatially separated or consisted of a single grey field on the black screen. Experiments were run under three environmental conditions: dark-adaptation, daylight, and rod-saturation after exposure to bright light. In a first task, we measured probabilities of contrast, assimilation, and no effect in a three-alternative forced-choice procedure (background appears brighter on the ‘left’, on the ‘right’ or the ‘same’). Visual adaptation and inducer contrast had no significant influence on the induction effects produced by colored inducers. Achromatic inducers produced significantly stronger contrast effects after dark-adaptation, and significantly stronger assimilation in daylight conditions. Grouping two backgrounds into a single one was found to significantly decrease probabilities of apparent contrast. Under the same conditions, we measured probabilities of the inducers to be perceived as nearer to the observer inducers. These, as predicted by Chevreul’s law of contrast, were determined by the luminance contrast of the inducers only, with significantly higher probabilities of brighter inducers to be seen as nearer, and a marked asymmetry between effects produced by inducers of opposite sign. Implications of these findings for theories which attempt to link simultaneous induction effects to the relative depth of object surfaces in the visual field are discussed. (shrink)

Poorly saturated colors are closer to a pure grey than strongly saturated ones and, therefore, appear less “colorful”. Color saturation is effectively manipulated in the visual arts for balancing conflicting sensations and moods and for inducing the perception of relative distance in the pictorial plane. While perceptual science has proven quite clearly that the luminance contrast of any hue acts as a self-sufficient cue to relative depth in visual images, the role of color saturation in such figure-ground organization has remained (...) unclear. We presented configurations of colored inducers on grey ‘test’ backgrounds to human observers. Luminance and saturation of the inducers was uniform on each trial, but varied across trials. We ran two separate experimental tasks. In the relative background brightness task, perceptual judgments indicated whether the apparent brightness of the grey test background contrasted with, assimilated to, or appeared equal (no effect) to that of a comparison background with the same luminance contrast. Contrast polarity and its interaction with color saturation affected response proportions for contrast, assimilation and no effect. In the figure-ground task, perceptual judgments indicated whether the inducers appeared to lie in front of, behind, or in the same depth with the background. Strongly saturated inducers produced significantly larger proportions of foreground effects indicating that these inducers stand out as figure against the background. Weakly saturated inducers produced significantly larger proportions of background effects, indicating that these inducers are perceived as lying behind the backgrounds. We infer that color saturation modulates figure-ground organization, both directly by determining relative inducer depth, and indirectly, and in interaction with contrast polarity, by affecting apparent background brightness. The results point towards a hitherto undocumented functional role of color saturation in the genesis of form, and in particular figure-ground percepts in the absence of chromatostereopsis. (shrink)

The laws which predict how the perceptual quality of figure-ground can be extracted from the most elementary visual signals were discovered by the Gestaltists, and form an essential part of their movement (see especially Metzger, 1930, and Wertheimer, 1923 translated and re-edited by Lothar Spillmann, 2009 and 2012, respectively). Distinguishing figure from ground is a prerequisite for perception of both form and space (the relative positions, trajectories, and distances of objects in the visual field. The human brain has an astonishing (...) capacity for selecting and combining a few critical visual signals to accurately represent both form and space. (shrink)

Victor Vasarely's (1906–1997) important legacy to the study of human perception is brought to the forefront and discussed. A large part of his impressive work conveys the appearance of striking three-dimensional shapes and structures in a large-scale pictorial plane. Current perception science explains such effects by invoking brain mechanisms for the processing of monocular (2D) depth cues. Here in this study, we illustrate and explain local effects of 2D color and contrast cues on the perceptual organization in terms of figure-ground (...) assignments, i.e. which local surfaces are likely to be seen as “nearer” or “bigger” in the image plane. Paired configurations are embedded in a larger, structurally ambivalent pictorial context inspired by some of Vasarely's creations. The figure-ground effects these configurations produce reveal a significant correlation between perceptual solutions for “nearer” and “bigger” when other geometric depth cues are missing. In consistency with previous findings on similar, albeit simpler visual displays, a specific color may compete with luminance contrast to resolve the planar ambiguity of a complex pattern context at a critical point in the hierarchical resolution of figure-ground uncertainty. The potential role of color temperature in this process is brought forward here. Vasarely intuitively understood and successfully exploited the subtle context effects accounted for in this paper, well before empirical investigation had set out to study and explain them in terms of information processing by the visual brain. (shrink)

The 18th-century Scottish ‘common sense’ philosopher Thomas Reid argued that perception can be distinguished on several dimensions from other categories of experience, such as sensation, illusion, hallucination, mental images, and what he called ‘fancy.’ We extend his approach to eleven mental categories, and discuss how these distinctions, often ignored in the empirical literature, bear on current research. We also score each category on five properties (ones abstracted from Reid) to form a 5 × 11 matrix, and thus can generate statistical (...) measures of their mutual dependencies, a procedure that may have general interest as illustrating what we can call ‘computational philosophy.’. (shrink)

Psychophysical scales can be constructed under suitable restrictions from appropriate data, but they still do not justify privileged internal sensations.

Color vision provides accurate measures of the phase and intensity of daylight, and also a means of discriminating between objects. Neither property implies that objects are colored.

Less salient, lower contrast disks appear to be more numerous than more salient, higher contrast disks when intermingled in equal numbers into the same display, but they are equal in perceived numerosity when segregated into different displays. Comparative judgements indicate that the apparent numerosity of the lower contrast disks is unaffected by being intermingled with high contrast disks, whereas the high contrast disks are reduced in numerosity by being intermingled with the low contrast ones. Here, we report that this illusion (...) also occurs for absolute judgements of the numerosities of displays of from 20 to 80 disks. A model based on luminance-difference contrast normalization explains the illusory loss of high-contrast items along with veridical perception of the low-contrast ones. The model correctly predicts that perceived numerosity is linearly related to the square-root of the number of disks, with the extent of the illusion depending on an attentionally-weighted function of contrast and assimilation. (shrink)

The “Perky effect” is the interference of visual imagery with vision. Studies of this effect show that visual imagery has more than symbolic properties, but these properties differ both spatially (including “pictorially”) and temporally from those of vision. We therefore reject both the literal picture-in-the-head view and the entirely symbolic view.

Adam Smith writes favorably about innovation in Wealth of Nations while writing unfavorably about a figure associated with innovation: the projector. His criticism of projectors prompts many scholars to claim that Smith disapproves of entrepreneurship. But Smith criticizes the projector not because he acts as an entrepreneur but because he fails to meet Smith’s moral standards for entrepreneurship. In Theory of Moral Sentiments, Smith conceives of a framework for moral entrepreneurship based on prudence. The framework consists of two principles: (...) first, approach everyday matters with the general “tenor of conduct” that governs your life and trade, and second, approach life-changing matters with prudence and justice. Recognizing that Smith is concerned with the total effect that an entrepreneurial venture has on society beyond its immediate profits opens the door to engage with contemporary research that studies the ethical and moral externalities of entrepreneurship. (shrink)

In a brief article under the present title, Adam Parry raised a simple but profound question: were there certain things that the inherited vocabulary of oral poets did not allow them to sayF; The mere raising of this question, whatever his answer, is enough to make the article one of the more important contributions to Homeric studies in the last fifty years. As it happens, his answer was affirmative, and it has not been contested. Contested it will now be.

In a brief article under the present title, Adam Parry raised a simple but profound question: were there certain things that the inherited vocabulary of oral poets did not allow them to sayF; The mere raising of this question, whatever his answer, is enough to make the article one of the more important contributions to Homeric studies in the last fifty years. As it happens, his answer was affirmative, and it has not been contested. Contested it will now be.

_Rhetoric_ is the sixth volume in The New Hackett Aristotle series, a series featuring translations, with Introductions and Notes, by C. D. C. Reeve, Delta Kappa Epsilon Distinguished Professor of Philosophy at The University of North Carolina at Chapel Hill. The series will eventually include all of Aristotle's works.

"Adam Wiegner's work belongs to Polish analytical philosophy, but it falls outside of its main current, the Lvov-Warsaw School, which was influenced by Hume's ideas. Wiegner, influenced by neo-Kantianism, developed a non-Humean conception of "holistic empiricism," which anticipates some of the ideas of K. R. Popper and W. V. O. Quine. Some of his ideas remain original to this day. His main research interests included epistemology, philosophy of mind, philosophy of science especially philosophy of psychology, analytical history of philosophy, (...) and interpretation of traditional logic in terms of mathematical logic."--BOOK JACKET. (shrink)

"It is... remarkable that Reeve's is the first new English translation since Fowler's Loeb edition of 1926. Fortunately, Reeve has done an excellent job. His version is not slavishly literal but is in general very accurate. It is also very clear and readable. Reeve is particularly to be congratulated for having produced versions of some of the more torturous passages, which are not only faithful to the text but also make good sense in English. The long and detailed introduction is (...) worth reading in its own right." --R. F. Stalley, _The Classical Review_. (shrink)

Aristotle on Practical Wisdom is the first full-scale commentary on Nicomachean Ethics VI to be issued in a century, and the most illuminating ever. A meticulous translation with facing-page analysis enables readers to engage directly with Aristotle's account, while the lucid introduction locates it in the context of his—and later—ethical thought.

W. Matthews Grant's "Dual Sources Account" aims at explaining how God causes all creaturely actions while leaving them free in a robust libertarian sense. It includes an account of predestination that is supposed to allow for the possibility that some created persons ultimately spend eternity in hell. I argue here that the resources Grant provides for understanding why God might permit created persons to end up in hell are, for two different reasons, insufficient. I then provide possible solutions to these (...) two problems, compatible with Grant's account overall, that help show why God might allow hell. (shrink)

The contemporary astrophysicist today deals with questions that bear on the area known to traditional philosophy as “metaphysics.” Consequently, it is tempting to cross the threshold. One can allow oneself to be tempted by the idea that science is in a position to provide solutions to ancient and venerable metaphysical quests. One can even imagine, according to the wish expressed two thousand years ago by Epicurus, that it can calm our “metaphysical anxieties.”.

The demand for female labor is a central explanatory component of macrostructural theories of gender stratification. This study analyzes how the structural demand for female labor affects gender differences in labor force participation. The authors develop a measure of the gendered demand for labor by indexing the degree to which the occupational structure is skewed toward usually male or female occupations. Using census data from 1910 through 1990 and National Longitudinal Sample of Youth data from 261 contemporary U.S. labor markets, (...) the authors show that the gender difference in labor force participation covaries across time and space with this measure of the demand for female labor. (shrink)

In this paper I argue that both defence and criticism of the claim that humans act ‘under the guise of the good’ neglects the metaphysical roots of the theory. I begin with an overview of the theory and its modern commentators, with critics noting the apparent possibility of acting against the good, and supporters claiming that such actions are instances of error. These debates reduce the ‘guise of the good’ to a claim about intention and moral action, and in so (...) doing have become divorced from the theory's roots in classical and medieval philosophy. Aristotle and Aquinas’ ‘guise of the good’ is primarily a metaphysical claim resting on the equivalence between actuality and goodness, from which conclusions about moral action are derived. I show the reasoning behind their theory and how it forms the basis for the claims about intention and action at the centre of the modern debate. Finally, I argue that the absence of its original foundation is apparent in recent attacks on the ‘guise of the good’. It is unsurprising that modern action theory and ethics have not always been able to comfortably accommodate the ‘guise of the good’; they are only telling half of the story. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Journal of the History of Philosophy 39.3 (2001) 453-454 [Access article in PDF] Gregory Fried. Heidegger's Polemos: From Being to Politics. New Haven: Yale University Press, 2000. Pp. xvi + 302. Cloth, $35.00. That an outstanding philosopher could align himself with a monstrous ideology has always been a scandalous puzzle: but since Farias's Heidegger and Nazism (1989), it is impossible to dismiss Heidegger's "political episode" as the reprehensible but (...) forgivable lapse of a backwoods academic without political sense. Learning that Heidegger not only was a dedicated Nazi, but engineered a postwar cover-up of his involvement, was for many Heideggereans like entering a beloved office and finding swastikas spraypainted over everything. Consternation has hardly died down in the years since. Philosophers have struggled either to repudiate Heidegger's thought entirely or argue that the parts of it he pledged to Nazism were inconsistent with the rest. It isn't that such people deny (or not out loud) what would seem to be an obvious fact: that a bad man can be a good philosopher. They fear that something in Heidegger's thinking somehow "entails" fascism. A dilemma gets set up: either Heidegger's philosophy is contaminated by his actions, or to engage in those actions, Heidegger must have ignored his philosophy.Fried's book on polemos in Heidegger navigates between these horns: on the one hand, Fried dismisses as "absurd" any simple claim that Heidegger's work entails fascism (5), but on the other hand, he attempts to trace, throughout Heidegger's "middle period" (roughly Being and Time to the end of World War II), a notion he believes is consistent with embracing Nazism, not to argue that Heidegger's political decisions were correct or unavoidable, but that they were predictable—though fatally hubristic—responses to the European situation as Heidegger saw it. More, Fried wants to endorse Heidegger's understanding of polemos as valuable for politics today, not because it is insulated against fascism but because fascism is still a possibility we need to confront, even while we attempt to preserve Enlightenment ideals and liberal-democratic institutions in a "nihilistic" world.Heidegger bases his views about polemos ("struggle," "confrontation") on Heraclitus Fragment 53, where it is called "father and king of all." As he explores Heidegger's [End Page 453] treatment, Fried stresses that "what is of interest is not whether Heidegger's interpretations are philologically correct, but rather how these readings shed light on his own way of making sense of history and of politics" (29). And "confrontation" is the closest thing to a consistent political doctrine in Heidegger. He understands it as a respectful opposition that allows each "side" to appear in all its validity and therefore potential risk to the other "side." Confrontation is a principle of interpretation, dialogue between individuals, and interaction between nations (see 79-80). Fried insists that this idea is a crucial part of a number of central Heideggerean concepts, as well as how Heidegger viewed his own task, and Germany's, when National Socialism appeared with its promise of a new spiritual mission for the German Volk. That Heidegger's "romantic" hopes in Nazism were unfounded does not diminish the usefulness of his work on polemos, Fried thinks, because "postmodernist" thinkers, molded by Heidegger, have nothing better to offer as they "confront" the dying or dead "modern" world with dreams of a new society. Some respect for "liberal" values will still be necessary if postmodernist "deconstruction" of oppressive structures is not to leave inroads for new, opportunistic forms of fascism.Fried's is an important study, by a sympathetic but undazzled scholar of Heidegger, of a concept that may be as basic and fruitful as he claims: but his insistence on making everything in "middle Heidegger" depend on it causes him in many places to conflate separate projects and periods in Heidegger's work that were better left distinct. He is particularly unconvincing when he suggests (e.g., 59, 100, 116) that for Heidegger, human beings can "lose their Dasein" and become "unbeings" to whom "Being is... (shrink)

The foundation for a system of morals, this 1749 work is a landmark of moral and political thought. Its highly original theories of conscience, moral judgment, and virtue offer a reconstruction of the Enlightenment concept of social science, embracing both political economy and theories of law and government.

This new translation of _On Coming to Be and Passing Away _and_ Meteorology 1 and 4_ fits seamlessly with the other volumes in the New Hackett Aristotle Series, enabling Anglophone readers to study these works in a way previously not possible. The Introduction describes the book that lies ahead, explaining what it is about, what it is trying to do, how it goes about doing it, and what sort of audience it presupposes. Sequentially numbered, cross-referenced endnotes provide the information most (...) needed at each juncture, while a detailed Index indicates the places where focused discussion of key notions occurs. (shrink)

Sir Francis Galton writes: “Those who find a difficulty in understanding how a feebly felt mental action can vanquish a strong desire, will find the difficulty vanish if they consent to assume a physiological and not a psychical standpoint. The gain is as great as viewing the planetary system after the fashion of Copernicus, instead of that of Ptolemy. There is nothing contrary to experience in supposing that conflicting physiological actions may be perceived with a distinctness quite disproportionate to their (...) real efficacy. We may compare the conflict between faintly perceived activities of one kind and clearly perceived activities of another kind, to that between troops dressed in a uniform scarcely distinguishable from the background with others clad in staring scarlet. We must be content to admit that our consciousness has a very inexact cognisance of the physiological battles in our brain, and that the mystery why apparently weak motives of one class should invariably get the better of apparently strong motives of another class, lies wholly in the word ‘apparently’. In short, that the appearances of their relative strength are deceptive”. (shrink)

Professor Bonnie Steinbock writes ‘… I am not going to discuss rights, important as the issue is’; but she adds, en passant , ‘According to the view of rights held by H. L. A. Hart and S. I. Benn, infants do not have rights, nor do the mentally defective, nor do the insane, in so far as they all lack certain minimal conceptual capabilities for having rights’.

In order to predict and explain behavior, one cannot specify the mental state of an agent merely by saying what information she possesses. Instead one must specify what information is available to an agent relative to various purposes. Specifying mental states in this way allows us to accommodate cases of imperfect recall, cognitive accomplishments involved in logical deduction, the mental states of confused or fragmented subjects, and the difference between propositional knowledge and know-how .

Mr William Charlton ) quotes Russell on Motion. It has been pointed out to me that the book referred to in line 5 as Principles of Philosophy should in all probability be The Principles of Mathematics , and on looking into the matter I find that this is indeed the case. On p. 473 of the latter book I read: 447. It is to be observed that … we must entirely reject the notion of a state of motion. Motion consists (...) merely in the occupation of different places at different times, subject to continuity as explained in Part V. (shrink)

Many have claimed that unspecific evidence sometimes demands unsharp, indeterminate, imprecise, vague, or interval-valued probabilities. Against this, a variant of the diachronic Dutch Book argument shows that perfectly rational agents always have perfectly sharp probabilities.

This thoughtful new abridgment is enriched by the brilliant commentary which accompanies it. In it, Laurence Dickey argues that the _Wealth of Nations_ contains--and conceals--a great deal of how Smith actually thought a commercial society works. Guided by his conviction that the so-called Adam Smith Problem--the relationship between ethics and economics in Smith's thinking--is a core element in the argument of the work itself, Dickey's commentary focuses on the devices Smith uses to ground his economics in broadly ethical and (...) social categories. An unparalleled guide to an often difficult and perplexing work. (shrink)

When one encounters disagreement about the truth of a factual claim from a trusted advisor who has access to all of one's evidence, should that move one in the direction of the advisor's view? Conciliatory views on disagreement say "yes, at least a little." Such views are extremely natural, but they can give incoherent advice when the issue under dispute is disagreement itself. So conciliatory views stand refuted. But despite first appearances, this makes no trouble for *partly* conciliatory views: views (...) that recommend giving ground in the face of disagreement about many matters, but not about disagreement itself. (shrink)