Boundary completion and surface filling-in are computationally complementary processes whose multiple processing stages form processing streams that realize a hierarchical resolution of uncertainty. Such complementarity and uncertainty principles provide a new foundation for philosophical discussions about visual perception, and lead to neural explanations of difficult perceptual data.

The question is broadened from isomorphism to invertible transformation and optimal representation. Motivations are drawn from image compression but with an emphasis on object segmentation. Filling-in is considered as the phenomenal side of the binding process with back-surface filling-in being important. Finally, re-normalization of local filtering by globally integrated context is emphasized.

Pessoa et al. (1998a) summarize a wide body of data suggesting that perceptual filling-in phenomena can be attributed to neural filling-in processes. However, they reject, on philosophical grounds, the hypothesis that filled-in representations in the brain are the immediate substrate of visual percepts. It is proposed in this commentary that resonant binding between distributed cortical areas may instead be the crucial ingredient for conscious visual percepts, and that filling-in processes may facilitate the interactions between behaving organisms and (...) object surfaces. These suggestions circumvent some of the philosophical problems associated with the idea of localized visual representations. (shrink)

A few findings from our laboratory are provided as evidence favoring “isomrphism” in filling-in. One is the responsivity of macaque-cortical area V1 cells to a stimulus designed for surface filling-in at the blind spot. Another is a phenomenological observation of motion aftereffect confined within a filled-in surface at the blind spot. Our recent study on the monkey's perception of surface filling-in at a scotoma is also mentioned.

This informative and conceptually stimulating target article is very useful. I merely query whether the term “illusory contours” is appropriate for gap filling; “illusory surfaces” seems better – and “fictional surfaces” better still. These seem to be rule based rather than knowledge based, suggesting indeed the importance of distinguishing rules (analogous to syntax in language) from knowledge (equivalent to semantics) for classifying perceptual phenomena.

This commentary sides with Pessoa and his colleagues in arguing that some types of perceptual filling-in are linked with a spread of cortical activity, a hypothesis that has often been rejected on philosophical grounds. Some recent data are discussed that strengthen this linking hypothesis and indicate that a spread of cortical activity may be essential for normal surface perception.

The development of explicit theories of dynamic context change has led to a fundamentally new perspective on the interpretation of discourse. In this paper I show that this development also opens up the possibility of approaching subclausal composition along similar lines. More specifically, I argue that a dynamic theory where type-driven rules apply directly to overt surface structures and fill in missing information by building anaphoric bridges is more faithful to natural language semantics than the classical Montagovian approach.

The segregation of image parts into foreground and background is an important aspect of the neural computation of 3D scene perception. To achieve such segregation, the brain needs information about border ownership; that is, the belongingness of a contour to a specific surface represented in the image. This article presents psychophysical data derived from 3D percepts of figure and ground that were generated by presenting 2D images composed of spatially disjoint shapes that pointed inward or outward relative to the (...) continuous boundaries that they induced along their collinear edges. The shapes in some images had the same contrast (black or white) with respect to the background gray. Other images included opposite contrasts along each induced continuous boundary. Psychophysical results demonstrate conditions under which figure-ground judgment probabilities in response to these ambiguous displays are determined by the orientation of contrasts only, not by their relative contrasts, despite the fact that many border ownership cells in cortical area V2 respond to a preferred relative contrast. Studies are also reviewed in which both polarity-specific and polarity-invariant properties obtain perceptual figure-ground grouping results. The FACADE and 3D LAMINART models are used to explain these data. Keywords: figure-ground separation, border ownership, perceptual grouping, surface filling-in, V2, V4, FACADE Theory. (shrink)

A simple working taxonomy with three classes of pictorial completion is proposed as an alternative to Pessoa et al.'s classification: area, surface, and contour completion. The classification is based on psychophysical evidence, not on the different phenomenal attributes of the stimuli, showing that pictorial completion is likely to involve mechanistic interactions in the visual system at different levels of processing. Whether the concept of “filling-in” is an appropriate metaphor for the visual mechanisms that may underlie perceptual completion is (...) questioned. (shrink)

Although there is empirical evidence of neural filling-in, this does not necessarily entail “isomorphic” theory. Most cortical neurons do not respond to a uniform surface and are instead sensitive to surface size and quality. I propose that a population of such neurons encodes the presence of a surface. This scheme is different from either the “cognitive” or “isomorphic” theories.

The thresholds of human observers detecting line targets improve significantly when the targets are presented in a spatial context of collinear inducing stimuli. This phenomenon is referred to as spatial facilitation, and may reflect the output of long-range interactions between cortical feature detectors. Spatial facilitation has thus far been observed with luminance-defined, achromatic stimuli on achromatic backgrounds. This study compares spatial facilitation with line targets and collinear, edge-like inducers defined by luminance contrast to spatial facilitation with targets and inducers defined (...) by color contrast. The results of a first experiment show that achromatic inducers facilitate the detection of achromatic targets on gray and colored backgrounds, but tend to suppress the detection of chromatic targets. Chromatic inducers facilitate the detection of chromatic targets on gray and colored backgrounds, but tend to suppress the detection of achromatic targets. Chromatic spatial facilitation appears to be strongest when inducers and background are isoluminant. The results of a second experiment show that spatial facilitation with chromatic targets and inducers requires a longer exposure duration of the inducers than spatial facilitation with achromatic targets and inducers, which is already fully effective at an inducer exposure of 30 ms only. The findings point towards two separate mechanisms for spatial facilitation with collinear form stimuli: one that operates in the domain of luminance, and one that operates in the domain of color contrast. These results are consistent with neural models of boundary and surface formation which suggest that achromatic and chromatic visual cues are represented on different cortical surface representations that are capable of selectively attracting attention. Multiple copies of these achromatic and chromatic surface representations exist corresponding to different ranges of perceived depth from an observer, and each can attract attention to itself. Color and contrast differences between inducing and test stimuli, and transient responses to inducing stimuli, can cause attention to shift across these surface representations in ways that sometimes enhance and sometimes interfere with target detection. (shrink)

Experiments using a preferential looking method, a perceptual judgment method, and a predictive judgment method investigated the development, from 7 months to 6 years of age, of sensitivity to the effects of gravity and inertia on inanimate object motion. The experiments focused on a situation in which a ball rolled off a flat surface and either continued in linear motion (contrary to gravity), turned abruptly and moved downward (contrary to inertia), or underwent natural, parabolic motion. When children viewed the (...) three fully visible motions, both the preferential looking method and the perceptual judgment method provided evidence that sensitivity to inertia developed between 7 months and 2 years, and that sensitivity to gravity began to develop after 3 years. When children predicted the future location of the object without viewing the motions, the predictive judgment method provided evidence that sensitivity to gravity had developed by 2 years, whereas sensitivity to inertia began to develop only at 5±6 years. These findings suggest that knowledge of object motion develops slowly over childhood, in a piecemeal fashion. Moreover, the same system of knowledge appears to be tapped both in preferential looking tasks and in judgment tasks when children view fully visible events, but a different system may underlie children's inferences about unseen object motions. (shrink)

From nearly the author's first experience entering the underwater city of Rapture in BioShock, she is treated to a taste of Andrew Ryan's propaganda. Andrew Ryan regularly says that citizens of Rapture need to avoid all contact with the surface world because it's filled with parasites who seek to destroy Rapture. Even though what Ryan says about the outside world is true, he's lying because he believes it to be false. According to Harry Frankfurt, bullshit is when the speaker (...) doesn't particularly care whether what she says is true or false. The analysis in this chapter suggests that propaganda is more closely connected to bullshitting than lying. The author says that if propaganda is more closely associated with bullshit than lies, then this also means that one should be particularly worried by governments (or individuals with power, such as Andrew Ryan) that engage in lots of propaganda. (shrink)

In late August 2012, artist Paul Thomas and philosopher Timothy Morton took a stroll up and down King Street in Newtown, Sydney. They took photographs. If you walk too slowly down the street, you find yourself caught in the honey of aesthetic zones emitted by thousands and thousands of beings. If you want to get from A to B, you had better hurry up. Is there any space between anything? Do we not, when we look for such a space, encounter (...) a plenitude of other things —a slice of plaster, an old vinyl record, a flattened piece of aluminum, painted metal surfaces, nameless interstitial powder, the reflection of sky, some letters of the alphabet, roughened concrete. Between what we take to be things there exist other things, as if the universe were jammed with entities like clowns in a crowded Expressionist painting. An abyss of things that emanates from them, not a yawning void that threatens to engulf them, but a sunlit nothingness filled with dust that seems to spray out of them like dry mist sparkling with firefly swarms. In these so-called spaces, we encounter the work of causality. Look: someone painted over this crack, some sunlight rippled in a mirage, a hole appeared. When we look for causes and effects, we don't encounter a basement of efficiently whirring machinery. Rather, we encounter these in-between spaces, where we had not thought to look. What we see are stage hands moving the scenery about—they are doing it in plain sight, the best place to hide, right in front of you, in the place we call the aesthetic dimension . In Tibetan Buddhism these spaces are called bardo , which just means the between. There is no such thing as a moment of your life that is not a between, according to this view. There is the between of living. There is the between of dying. There is the between of the transition between lives. There is the between of dreaming. There is the between of meditation. There is the between of two humans holding cameras walking down a street in Sydney. The between of two buildings, a space bursting with objects as if a billion jack in the boxes had exploded at once. Some of the lids are stuck, sometimes a nose bursts out and the hinge won't open any further; at other times, the jack in the box flies right out and pulps against the wall on the opposite side of the room. Time opens up. Each surface is a poem about the past. A myriad stories begin to proliferate, as if a thing were a crisscrossing of books, a whole library of them, each page whispering parts of paragraphs and broken pieces of word. The stories tell us things—they are quite literal, look, this guy painted part of this wall, then they came and stripped off the panel and touched up the holes. Form is the past. When you look at appearance, you are looking at the past. Where is the present? And essence is the future. The hints of unknown, unseen things, the absolute impossibility of grasping everything about this plastic pipe, the way photons entering the camera lens obey a speed limit and splash onto receptors, going into and out of coherence. At the electronic level, it's quite clear that causality is aesthetic. I can't see an electron without deflecting it. Everything is a refrigerator with a light on—or off—inside. For me, for you, for this arrangement of tiles sandwiched between a door and a slab of marble. To a photon, an electron is a refrigerator with a closed door, and a light that might be on—or off—inside. How can you know whether the light is on inside? Why, you open the door of course. But then you are looking at the past. You never see the light in the refrigerator before you open the door. This future is not a predictable future that is a specific number of now-points away. You will never reach it. You will never be able to sneak up from the side and see through the refrigerator. Nor can a photon see through the refrigerator of an electron. Nor can paint see through the refrigerator of this plastic pipe. You take a photo—click—the past appears, another open refrigerator. But the thing you have just made, the photograph, the graphing of the photons—it is another thing, another story. You can read the words, but the meaning always eludes you. It always lurks just off the edge of the sentence, just at the very edge of this ragged slice of paint, just at the edge of this building, between this one and that one. Thousands of secrets, everywhere. Masks that lie and tell the truth at the same time: this pink paint is not blue paint, that's true. But the thing, the thing in itself, that paint sliding off a brush onto that pipe—it is nowhere to be seen, like a light behind a closed door. When you walk too slowly down the street, you start walking into millions of levels of pastness, levels emitted not just by the humans or the dogs and cats, but also by this garbage can, this mottled pink surface pockmarked with nail holes. You walk surrounded by as many futures as there are things. You walk, or rather you occupy a peculiar shifting ground of nowness, created by the relative motion of the past sliding against the future, not touching. You begin to realize that the present does not exist. A thing is a train station where one train is always arriving and one train is always leaving. Hundreds of train stations everywhere, hundreds of relative motions. The idea of a universal, regular, atomic sequence of instants that contains everything is absolutely ludicrous, the philosophers have known this for thousands of years, and to hide the absurdity, to get from A to B, Houston to Sydney, crossing the International Date Line without too much laughter, you have embedded piezoelectric devices in as many pieces of hardware as possible, devices in which quartz talks to electrons, making train stations where the trains seem to run on time. When you walk too slowly down the street, you begin to realize that Zeno had a point. You can seemingly divide each moment, each step, infinitesimally. So perhaps there are no moments, no steps. Or perhaps time is not a box that everything goes in. Perhaps time is, as Einstein argued after all, a way that things send out ripples. Where one house touches another house, there arise hundreds of things, hundreds of meeting places (Old English thing , meeting place). Hundreds of times. I have a thing for you. Come over here, let's do a thing. Stay in the sunlight and shadow between worlds, in the sunlit canyon between this building and that building. See how paint touches this pipe, caressing then leaving, no one will notice if a surface is left exposed, not quite filled in. See how shadows are reflected in pale cream glass—see the luminous abyss of causality spreading out before your very eyes, right in front of security. All kinds of beautiful crimes are committed right here, and as American cars keep telling you, and you never notice, OBJECTS IN MIRROR ARE CLOSER THAN THEY APPEAR. They are here, or rather, here is them, and now is them. Kissing in the shadow. Tim Morton Rice University. (shrink)

As a result of the publicly funded Human Genome Project (HGP), and an increasing number of private enterprises, a new form of eugenic theory and practice has emerged, differing from previous manifestations. Genetic testing has become a consumer service that may now be purchased at greatly reduced cost. While the old eugenics was pseudoscientific, the new eugenics is firmly based on DNA research. While the old eugenics focused on societal measures against the individual, the new eugenics emphasizes the family as (...) a control agent. Eugenics is now voluntary, with the promise of abortion for those afraid of producing genetically damaged children. The ethical concepts of beneficence, avoidance of maleficence, autonomy, and equity are discussed in terms of aspects of the HGP. One major issue is the need for an ethical system available to health consumers that will empower them and assist in their biogenic decisions. “The concentration on the genes implicated in cancer is only a special case of a general genomania (emphasis added) that surfaces in ... the weekly announcements in The New York Times of the location of yet another gene for another disease. The revealing rhetoric of this publicity is always the same; only the blanks need to be filled in: ‘It was announced today by scientists at [Harvard, Vanderbilt, Stanford] Medical School that a gene responsible for [some, many, a common form of] [schizophrenia, Alzheimer’s, arteriosclerosis, prostate cancer] has been located and its DNA sequence determined. This exciting research, say scientists, is the first step in what may eventually turn out to be a possible cure for this disease.’”. (shrink)

This essay begins with a discussion of the phenomenon of filling in. It is argued that filling in is naturally accounted for by taking visual experiences to be importantly like drawn pictures of the world outside. An alternative proposal is then considered, one that models visual experiences on incomplete descriptions. It is shown that introspection does not favor the pictorial view. It is also shown that the phenomenon of blurriness in visual experience does not provide a good reason (...) for favoring the pictorial view either. Why, then, be a pictorialist? It is argued that visual experiences conform to what have been called “the laws of appearance” and that their conformity to these laws gives us an excellent reason for preferring the pictorial account. (shrink)

One of the things you learn if you read books and articles in (or about) cognitive science is that the brain does a lot of "filling in"--not filling in, but "filling in"--in scare quotes. My claim today will be that this way of talking is not a safe bit of shorthand, or an innocent bit of temporizing, but a source of deep confusion and error. The phenomena described in terms of "filling in" are real, surprising, and (...) theoretically important, but it is a mistake to conceive of them as instances of something being filled in, for that vivid phrase always suggests too much--sometimes a little too much, but often a lot too much. Here are some examples (my boldface throughout). (shrink)

In visual science the term filling-inis used in different ways, which often leads to confusion. This target article presents a taxonomy of perceptual completion phenomena to organize and clarify theoretical and empirical discussion. Examples of boundary completion (illusory contours) and featural completion (color, brightness, motion, texture, and depth) are examined, and single-cell studies relevant to filling-in are reviewed and assessed. Filling-in issues must be understood in relation to theoretical issues about neuralignoring an absencejumping to a conclusionanalytic isomorphismCartesian (...) materialism, a particular neural stage that forms the immediate substrate of perceptual experience enactiveanimatesubpersonal” considerations about internal processing, but rather by considerations about the task of vision at the level of the animal or person interacting with the world. (shrink)

This essay begins with a discussion of the phenomenon of filling in. It is argued that filling in is naturally accounted for by taking visual experiences to be importantly like drawn pictures of the world outside. An alternative proposal is then considered, one that models visual experiences on incomplete descriptions. It is shown that introspection does not favor the pictorial view. It is also shown that the phenomenon of blurriness in visual experience does not provide a good reason (...) for favoring the pictorial view either. Why, then, be a pictorialist? It is argued that visual experiences conform to what have been called “the laws of appearance” and that their conformity to these laws gives us an excellent reason for preferring the pictorial account. (shrink)

We considered peculiarities of the evolution of a region with sharp boundaries that is filled with a partially ionized plasma and is a part of the volume of a condensed target. The creation of such a region in the near-surface layer of the target can be related to the action of an external impulse symmetric ionizator or to the action of an intense small-extension shock wave on the target surface. We defined the conditions such that their fulfilment during (...) the establishment of the equilibrium between the Coulomb attraction of electrons and ions with atom ionization multiplicity Z* 1 and the kinetic pressure of electrons causes both the compression of this region and its ionization to the state with Z* 2 > Z* 1. The last leads to a further additional compression and ionization. Under these conditions, the spontaneous avalanche-like ionization of atoms of the target to the state of ‘‘bare’’ nuclei occurs synchronously with the avalanche-like metallization and the self-compression of the target. We showed that the avalanche-like ionization and the self-compression of the target happen in the case where the gas of degenerate electrons has drift momentum. If the region with initial ionization has the form of thin spherical layer, the process of avalanche-like ionization and self-compression of the target in this region is accompanied by the accelerated movement of the plasma layer to the target center. One of the reasons for the accelerated movement is the surface tension in a bounded domain of the nonequilibrium plasma layer neutralized by ions of the target. With increase in the velocity of movement of this layer to the target center, the additional self-compression of the system of electrons and nuclei to the state of degenerate electron gas occurs. At the leading edge of the running layer with extremely high electron density which is neutralized by nuclei of the target, the formation of a collapse of the electron--nucleus system proceeds, and the binding energy maximum for the electron--nucleus system shifts from A≈60 to A ≫ 60. This result makes possible the fast synthesis of superheavy nuclei. The decay of the collapse state, a partial restoration of the target structure, its rapid cooling, and the condensation of a part of the products of nuclear reactions happen in the target volume at the trailing edge of the moving plasma layer. Upon such a scanning propagation of the wave with high electron density, all the target substance is involved, step-by-step, to the process of nuclear transformations. At the target center, the moving plasma layer is squeezed with the formation of the state of quasistationary collapse under inertial confinement. Then the collapse state decays irreversibly. (shrink)

Filled-in sensations exhibit a distinctive mélange of causal features, resembling perceptual sensations in some respects and imagery in others. This commentary identifies several of these shared causal features and advances the hypothesis that filled-in sensations may constitute the primordial species of imagery, the evolutionary neurofunctional precursor of paradigmatic forms of imagery.

Recently Timothy Williamson (2007) has argued that characterizations of the standard (i.e. intuition-based) philosophical practice of philosophical analysis are misguided because of the erroneous manner in which this practice has been understood. In doing so he implies that experimental critiques of the reliability of intuition are based on this misunderstanding of philosophical methodology and so have little or no bearing on actual philosophical practice or results. His main point is that the orthodox understanding of philosophical methodology is incorrect in that (...) it treats philosophical thought experiments in such a way that they can be “filled in” in various ways that undermines their use as counter-examples and that intuition plays no substantial role in philosophical practice when we properly understand that methodology as a result of the possibility of such filling in. In this paper Williamson’s claim that philosophical thought experiments cases can be legitimately filled in this way will be challenged and it will be shown that the experimental critique of the intuition-based methods involved a serious issue. (shrink)

Available corpora for Argument Mining differ along several axes, and one of the key differences is the presence (or absence) of discourse markers to signal argumentative content. Exploring effective ways to use discourse markers has received wide attention in various discourse parsing tasks, from which it is well-known that discourse markers are strong indicators of discourse relations. To improve the robustness of Argument Mining systems across different genres, we propose to automatically augment a given text with discourse markers such that (...) all relations are explicitly signaled. Our analysis unveils that popular language models taken out-of-the-box fail on this task; however, when fine-tuned on a new heterogeneous dataset that we construct (including synthetic and real examples), they perform considerably better. We demonstrate the impact of our approach on an Argument Mining downstream task, evaluated on different corpora, showing that language models can be trained to automatically fill in discourse markers across different corpora, improving the performance of a downstream model in some, but not all, cases. Our proposed approach can further be employed as an assistant tool for better discourse understanding. (shrink)

The following points are discussed in response to the commentaries: (1) A taxonomy of perceptual completion phenomena should rely on both phenomenological and mechanistic criteria. (2) Certain forms of perceptual completion are caused by topographically organized neural processes the view that there must be a pictorial or spatial neural-perceptual isomorphism at the bridge locus – should be rejected. Although more abstract kinds of isomorphism are central to the neural-perceptual mapping, the perceptual cannot be exhaustively explained in terms of the neural, (...) and therefore the explanation of perception cannot be reduced to uncovering neural-perceptual isomorphisms. (5) The task of vision is to guide action in the world, not to construct a detailed world-model in the head. (6) Neural filling-in facilitates the integration of information and thereby helps the animal find out about its environment. (7) Perceptual content needs to be understood at the level of the person or animal interacting in the world. (shrink)

Discriminating behavior depends on neural representations in which the sensory activity patterns guiding different responses are decorrelated from one another. Visual information can often be parsimoniously transformed into these behavioral bridge-locus representations within neuro-computational visuo-spatial maps. Isomorphic inverse-optical world representation is not the goal. Nevertheless, such useful transformations can involve neural filling-in. Such a subpersonal representation of information is consistent with personal-level vision theory.

(1) In the everyday situation of seeing a uniform patch on a variegated background, filling-in does seem to require a mechanism. (2) Our attempts to make matches to such a patch make us appreciate anew the elusiveness of the phenomenon.

“Finding out” about the visual world as approached from the organismic level may well include the “filling-in” type of perceptual completion if considered in terms of underlying neurophysiological mechanisms. But “filling in” can be interpreted not only as a result of within-level propagating of neural activity, but as a byproduct of the process that is necessary for modulating preconscious information about physically present objects or events so as to generate conscious quality in attending to them.

In this work we analyze the case of resistive conductor plates carrying constant currents, utilizing surface charge distributions. We obtain the electric potential in the plates and in the space surrounding them. We obtain a non-vanishing electric field outside the conductors. We compare the theoretical results with experimental data present in the literature.

A prime is a cue that makes associated concepts, behaviors, and goals more psychologically accessible to people, influencing their responses in subsequent related environments. I build a case that Direct to Consumer Advertising of Prescription Pharmaceuticals (DTCA) operates as a prime that causes some viewers to prefer and pursue the advertised drug. Drawing on literature from social psychology I show that people subject to priming are mostly unaware of its influence and liable to misattribute the reasons for their primed actions. (...) Misattribution typically includes heightened appraisals of the value of a primed goal. Consistent with this account, I argue that viewers primed by DTCA hold favorable, yet false beliefs about the safety and efficacy of the advertised drug. I further argue that, because those drug properties are material to viewers with the relevant illness, priming in DTCA can undermine the autonomy of their medicine choices. The threat to autonomy posed by priming in DTCA suggests it warrants attention from both regulators and the wider research community. It also adds further reason to be sceptical about the permissibility of this form of advertising. (shrink)

Eugene Gendlin claims that he wants "to think with more than conceptual structures, forms, distinctions, with more than cut and presented things" (WCS 29).1 He wants situations in their concreteness to be something we can think with, not just analyze conceptually. He wants to show that "conceptual patterns are doubtful and always exceeded, but the excess seems unable to think itself. It seems to become patterns when we try to think it. This has been the problem of twentieth century philosophy" (...) (WCS 29). As a result he has "long been concerned with what is not formed although always in some form" (TAD 1). In this essay I would like to explore some of the issues surrounding the relation of the unformed and the formed. Gendlin says that "we get beyond the forms by thinking precisely in them" (TAD 1). The two emphasized words have to be considered separately as well as together. In many essays Gendlin's main concern is with the "precisely": can something that is not fully formed and definite still direct us as we carry forward language and action? My discussion begins with that issue; I suggest ways that Gendlin's proposal connects with and differs from some current ideas in epistemology and the philosophy of language. Then my discussion moves to the "in": what sense can we make of the formed being unformed? Finally I suggest that Gendlin's program runs into some difficulties in this connection. (shrink)

(1) The main issue with regard to modal and amodal completion is not which phenomena are cognitive, and which perceptual. At the level of the animal, both are visuo-cognitive. At the level of visual processing, however, we need to dissect the different functional effects of these kinds of completion. (2) Resonant binding between distributed cortical areas may play a role in perceptual completion, but evidence is needed.