Crucial Experiment Research Articles

Dissociating the Effects of Visual Similarity for Brand Names and Common Words.

Abstractionist models of visual word recognition can easily accommodate the absence of visual similarity effects in misspelled common words (e.g., viotin vs. viocin) during lexical decision tasks. However, these models fail to account for the sizable effects of visual similarity observed in misspelled brand names (e.g., anazon produces longer responses and more errors than atazon). Importantly, this dissociation has only been reported in separate experiments. Thus, a crucial experiment is necessary to simultaneously examine the role of visual similarity with misspelled common words and brand names. In the current experiment, participants performed a lexical decision task using both brand names and common words. Nonword foils were created by replacing visually similar letters (e.g., anazon [baseword: amazon], anarilllo [amarillo, yellow]) or visually dissimilar letters (e.g., atazon, atarillo). Results showed sizeable visual letter similarity effects for misspelled brand names in response times and percent error. Critically, these effects were absent for misspelled common words. The pervasiveness of visual similarity effects for misspelled brand names, even in the presence of common words, challenges purely abstractionist accounts of visual word recognition. Instead, these findings support instance-based and weakly abstractionist theories, suggesting that episodic traces in the mental lexicon may retain perceptual information, particularly when words are repeatedly presented in a similar format.

Changing-state irrelevant speech disrupts visual-verbal but not visual-spatial serial recall.

In an influential article, Jones et al. (1995) provide evidence that auditory distraction by changing relative to repetitive auditory distracters (the changing-state effect) did not differ between a visual-verbal and visual-spatial serial recall task, providing evidence for an amodal mechanism for the representation of serial order in short-term memory that transcends modalities. This finding has been highly influential for theories of short-term memory and auditory distraction. However, evidence vis-à-vis the robustness of this result is sorely lacking. Here, two high-powered replications of Jones et al.'s (1995) crucial Experiment 4 were undertaken. In the first partial replication (n = 64), a fully within-participants design was adopted, wherein participants undertook both the visual-verbal and visual-spatial serial recall tasks under different irrelevant sound conditions, without a retention period. The second near-identical replication (n = 128), incorporated a retention period and implemented the task-modality manipulation as a between-participants factor, as per the original Jones et al. (1995; Experiment 4) study. In both experiments, the changing-state effect was observed for visual-verbal serial recall but not for visual-spatial serial recall. The results are consistent with modular and interference-based accounts of distraction and challenge some aspects of functional equivalence accounts. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Full lifetime demonstration of a Micro-Cathode-Arc thruster evolution characteristics

Ground lifetime test is the most crucial experiment to assess the performance, reliability, and flight qualification of electric propulsion, and it can bring new insights for understanding the operation characteristics. This work demonstrates a full lifetime test of 140000 cycles on a Micro-Cathode-Arc Thruster (μCAT) with 160 μs charging time and 86 mJ charging energy. A four-probe resistivity measurement method is utilized to investigate variations in the conductive film thickness and resistivity throughout the thruster lifespan. Direct film parameters show that the lifetime of the μCAT can be divided into three stages. In the initial stage, the film thickness decreases by 1.2 μm and the resistivity increases significantly due to the high discharge intensity and intense film ablation; In the steady stage, the change of the film thickness is within 5%, and the resistivity of the film increases slowly from 0.050 Ω·mm to 0.223 Ω·mm. In the end stage, the resistivity exponentially increases from 0.223 Ω·mm to 1.176 Ω·mm, with the increase accounting for 81%, ultimately resulting in the failure of the thruster open circuit. Additionally, the evolution of discharge parameters, and the variation of plume parameters are measured throughout the lifetime. The discharge characteristics also show significant differences in the duration of voltage and current in these three stages. The results of plume shape and plasma parameters are also well consistent with the discharge parameters and film state. These results suggest that, for evaluating the steady stage lifetime of thrusters, the film thickness is the best indicator compared to the variations in resistivity and voltage-current characteristics. For the end stage, the plasma plume morphology, discharge duration, and plume parameters can conveniently and clearly characterize the thruster failures and irregularity.

Chromatin Immunoprecipitation in Adipose Tissue and Adipocytes: How to Proceed and Optimize the Protocol for Transcription Factor DNA Binding.

Chromatin immunoprecipitation (ChIP) coupled to qPCR or sequencing is a crucial experiment to determine direct transcriptional regulation under the control of specific transcriptional factors or co-regulators at loci-specific or pan-genomic levels.Here we provide a reliable method for processing ChIP from adipocytes or frozen adipose tissue collection, isolation of nuclei, cross-linking of protein-DNA complexes, chromatin shearing, immunoprecipitation, and DNA purification. We also discuss critical steps for optimizing the experiment to perform a successful ChIP in lipid-rich cells/tissues.

Enhancing the Reliability Assessment System for Crucial Powertrain Components through Design, Simulation, and Experiment

Article Enhancing the Reliability Assessment System for Crucial Powertrain Components through Design, Simulation, and Experiment Xiaochun Zeng 1,2,3, Gongcheng Wang 1,* , Ying Liu 2,3, Jing Liu 1,2,3, Yinglian Feng 2,3,4, Xiuyong Shi 5,6, Diming Lou 5,6, Lei Zhang 4, Tao Wei 1, and Zhong Li 1 1 Jiangling Motors Co. Ltd., Nanchang 330001, China 2 Jiangxi Province Women Science and Technology Workers Association, Nanchang 330036, China 3 Jiangxi Mechanical Engineering Society, Nanchang 330002, China 4 Magna PT Powertrain (Jiangxi), Nanchang 330200, China 5 Nanchang Automotive Institute of Intelligence & New Energy, Nanchang 330052, China 6 Tongji University, Shanghai 200092, China * Correspondence: gwang7@jmc.com.cn Received: 5 September 2023 Accepted: 19 September 2023 Published: 20 September 2023 Abstract: This article conducted innovative research on heat balance, cooling and structural strength by using Computer Aided Engineering (CAE), design, and experiment. These multifaceted approaches rely on the meticulous application of dynamic analysis, combustion analysis, fluid dynamics, and finite element analysis. This research has devised a fatigue-oxidation-creep multi-fatigue life prediction technique for thermal engines, coupled with an innovative water jacket optimization method. By addressing the design challenges arising from the demanding requirements of high explosion pressure, formidable power, and significant torque in power systems, this study has made significant strides in advancing the field. And this method was used to establish the development capability of powertrain electric drive components. To enhance reliability and prediction accuracy, a simulation and test calibration method was devised for Crucial Powertrain Components. This article establishes a robust foundation by providing comprehensive data support for reliability target decomposition, facilitating the efficient derivation of component reliability metrics. Additionally, it explores potential customer scenario failures and investigates the underlying mechanisms of powertrain malfunctions. By establishing a correlation matrix between failure modes, mechanisms, and reliability experiments, the coverage of powertrain failure mode verification experiments was significantly increased by over 95%. Ultimately, this article contributes to the formation of a comprehensive technical system for evaluating the reliability of crucial powertrain components, integrating design, simulation, and experiment.

The epistemological limitations of scientific inquiry: Crucial experiments revisited

Scientific knowledge is the outcome of research and experimentation. How this goal is to be achieved is and has been a topic of much debate over the centuries. In the 17th century, the English philosopher and scientist Francis Bacon (1561-1626) regarded science as the systematic collecting and gathering of facts. Upon this view, nature tells us what the facts are on the assumption that we learn how to listen properly to nature. We design experiments and run them, and the verdict is to nature. Thus, “crucial” experimentation is the hallmark of science. A crucial experiment is an experiment that unambiguously favours one or the other of two competing hypotheses under test, no matter the outcome.
 
 At some stage in the development of science, it was believed that such crucial experiments can be designed. However, some philosophers deny that they are possible in some domains of scientific inquiry, while others deny that they are possible in any domain of scientific inquiry. In this context, the French physicist, historian and philosopher of science Pierre Duhem (1861-1916) argued that in physics, crucial experiments are not possible. While the American philosopher W. V. Quine (1908-2000) adopted the radical view that crucial experiments are forthcoming in no domain of scientific inquiry. In the philosophy of science, these two views are joined in what came to be known the Quine-Duhem Thesis.
 
 This study examines the controversial Quine-Duhem Thesis and discusses whether, or not, it is considered a threat to the rationality of science. The fundamental features of rationality in science are to be addressed. It is concluded that the Quine-Duhem thesis does not make an epistemological point and Quinean holism does not destroy the objectivity of science.

Galilean resonances: the role of experiment in Turing’s construction of machine intelligence

ABSTRACT In 1950, Alan Turing proposed his iconic imitation game, calling it a ‘test’, an ‘experiment’, and the ‘the only really satisfactory support’ for his view that machines can think. Following Turing’s rhetoric, the ‘Turing test’ has been widely received as a kind of crucial experiment to determine machine intelligence. In later sources, however, Turing showed a milder attitude towards what he called his ‘imitation tests’. In 1948, Turing referred to the persuasive power of ‘the actual production of machines’ rather than that of a controlled experiment. Observing this, I propose to distinguish the logical structure from the rhetoric of Turing’s argument. I argue that Turing’s proposal of a crucial experiment may have been a concession to meet the standards of his interlocutors more than his own, while his construction of machine intelligence rather reveals a method of successive idealizations and exploratory experiments. I will draw a parallel with Galileo’s construction of idealized fall in a void and the historiographical controversies over the role of experiment in Galilean science. I suggest that Turing, like Galileo, relied on certain kinds of experiment, but also on rhetoric and propaganda to inspire further research that could lead to convincing scientific and technological progress.

Effect of Applying Strong Column Weak Beam to the Laboratory’s Artificial Lighting System

Lighting is one of the crucial experiment factors in the laboratory. Laboratory’s lighting system that follows the Indonesian National Standard (SNI) can improve visual comfort during experiments. This research aims to determine the effect of strong column weak beam (SCWB) on illuminance in the laboratory according to SNI 6197:2011. The results were expected to provide recommendations for the implementation of SCWB in the laboratory so that the laboratory lighting system was more optimal. Digital Electronics Laboratory, E8 Building, Universitas Negeri Semarang had dimensions of 12m x 7m x 4m. The measurement of illuminance used general measurement and task measurements according to SNI 7062-2019. Illuminance data retrieval was carried out in two ways, namely observation and simulation. Measurement of laboratory’s illuminance by observation has been carried out for 10 days with repetition 10 times. The simulation of illuminance measurement used Dialux 10. Based on the results of observations and simulations, it can be seen that the Digital Electronics Laboratory did not follow SNI 6197:2011 with an illuminance of 31.3 – 137 lux. The simulation used the modifying lamp layout and applying TL LED (Philips Master LEDTube HO) so that the illuminance distribution of the Digital Electronics Laboratory followed SNI 6197: 2011 of 500 – 769 lux. The simulation results of the SCWB dimension variation showed that the recommended thickness of the SCWB was between 10 cm – 30 cm to obtain a more optimal illuminance.

Negative Velocity Characteristics in Electromagnetism

Newton mechanics is great, Newton's contribution is indelible. But from Newton's classical mechanics, the definition of velocity (=) must mean that this physical parameter is a vector, so "negative velocity" only means the opposite direction of motion, no other meaning. It is difficult to understand negative velocity within the framework of classical mechanics. However, wave is a special form of material motion, wave mechanics has a unique method and meaning, and its concept and connotation are significantly different from classical mechanics. For example, wave velocity (whether phase velocity or group velocity) is a scalar quantity. "Negative wave velocity" does not mean that the direction of motion is reversed, but a special phenomenon that does not accord with causality from the surface view. In any case, research in recent decades has shown that negative wave velocity is not only theoretically possible, it has also been repeatedly shown to exist experimentally. Moreover, negative wave velocity is a special form of superluminal speed; The wave with negative velocity is the advanced wave. It corresponds to the leading solution of the basic equation of electromagnetic field and electromagnetic wave. The past practice (discarding the advanced solution) is wrong! As for causality, scientists have provided a new definition and interpretation. In short, both wave mechanics and quantum optics take a different approach from classical mechanics.
 This paper points out that it is unusual for the 2022 Nobel Prize in Physics to be awarded to Alain Aspect and two others, since Aspect's experiments on the Bell inequality were completed in 1982, Which still stands today as a crucial experiment that proved Einstein's EPR paper wrong and quantum mechanics (QM) correct. Aspect's award in 2022 showed that mainstream physical community had been forced to accept that quantum entanglement existed and that the "light-speed limit" theory of SR was a mistake.
 This paper discusses the proposition "negative characteristic motion of electromagnetic wave" put forward by the author in 2013, pointing out that it is an inherent physical phenomenon reflecting symmetry in nature. In this paper, the faster-than-light motion of waves found in the near-field of antennas is discussed. In addition, the realizability of "time travel" is also discussed.

Making a National Program National: The US Resettlement of Displaced Persons After World War II

The end of the Second World War in Europe left millions of people out of place, including Jews left in concentration camps, forced laborers in the huge Nazi work camp system, and many Germans as well. For roughly a million of these people, no immediate return to their home countries was possible, and the United States—although very slowly—ultimately resettled the largest number of them. One important thread in these US efforts was the intent to make the resettlement program a fully national one. Those efforts are seen most clearly in states that would not at that time have been obvious destinations for displaced persons, or at least not obvious destinations for relatively large numbers of them. This article examines three states—North Dakota, Minnesota, and Mississippi. The resettlement program may not have been fully coherent in policy goals, including veering sharply at times from the original humanitarian intent. Yet the program worked well on its own terms and set a new standard for state and local involvement in resettlement that has continued through the major surges of refugees to the United States since then, including recent efforts on behalf of those from Afghanistan and Ukraine. This US experience of refugee resettlement through a flexible federal/state/local system, with strong involvement from both public and private sectors, remains a crucial experiment in resettlement and a reminder of the ways refugee and immigration policies and programs are intertwined.

Effects of long-term fertilization with contemporary Danish human urine, composted household waste and sewage sludge on soil nematode abundance and community structure

It is desirable to recycle the urban waste products human urine, composted household waste and sewage sludge as fertilizers to agricultural fields. This could minimize the use of NPK fertilizer, improve soil structure and store carbon. However, waste products may contain heavy metals, persistent organic pollutants (POP) and plastics, and there are concerns that long-term build-up of these substances will cause unwanted effects on soil health.Nematodes are ubiquitous and numerous in soil ecosystems. Abundance and community structure of soil nematodes can be used as indicators of soil health, as some species are vulnerable to pollution. There are well-developed methods for detecting environmental changes based on nematode community structure.At the long-term CRUCIAL field experiment, where alternative fertilizer products have been applied since 2003, we measured effects of long-term fertilization with human urine, composted household waste and sewage sludge on soil properties (pH, soil organic matter and nitrogen availability), abundance of soil microorganisms (bacteria, fungi, small protozoa and ciliates) and nematode trophic groups compared to plots with unfertilized, NPK and cattle manure treatment. Sampling and assessments were done three times during a growth season. Further, we assessed the composition of nematode communities using metabarcoding.Treatments with a high input of organic matter (cattle manure, composted household waste and sewage sludge) had high abundances of bacteria and thus bacterial grazers (small protozoa, ciliates, and bacterial feeding nematodes). We found a significant correlation between nematode community structure and pH and organic matter. We calculated the nematode Maturity Index 2–5 (pollution indicator) based on metabarcoding data, which did not differ significantly between the treatments.We conclude that long-term fertilization with different types of contemporary Danish urban waste products affects both soil properties and abundance of soil organisms, the latter largely reflecting the organic matter input of the fertilizer treatments. We found no adverse effect on nematode communities that could indicate pollution-induced stress on nematofauna or decreased soil fertility.

Entangled observers? A quantum perspective on authority in critical security studies

ABSTRACT The conventional author-driven summary of the Stern–Gerlach experiment omits the fact that their famous measurements only appeared when the smoke of a poor graduate student’s cheap cigar produced a reaction with the silver atoms. Indeed, this crucial experiment in the history of quantum physics would have been impossible if not for the fortuitous intersection of behavioural norms for white male elite – cigar smoking at the laboratory bench – and the material conditions of the junior scientist – a socioeconomic status that left him unable to afford higher-quality cigars. While the simplistic narrative of authorship may conveniently reduce this experiment to Stern and Gerlach, a quantum reading of this quantum experiment reveals the ontological entanglement of identity, materiality, social norms and the experimental apparatus itself with the authors – and, just with other entangled phenomena, our apparently simple description is woefully incomplete without acknowledging its entangled reality. Intervening into a decades-long debate on the nature of authorship, observation and rigour in critical security studies, I argue that the quantum model of ontologically entangled observation offers a powerful model for problematising authority in critical security studies .

Investigation of Gifted 5th Grade 'Students' Proof Skills

This study investigates the proof skills of gifted 5th-grade students. The study was conducted using the document analysis method, a type of qualitative study. The study included 25 students, 11 females and 14 males, all diagnosed as gifted and attending fifth grade in the center of the city in southern Turkey. The sample of the group was selected by the method of convenient sampling. A sample proof test with 6 items was used as an instrument for data collection. The written and visual data obtained were analyzed using descriptive analysis techniques. Balacheff's proof levels were used to characterize the pupils' responses. According to the findings, 7.33 percent of the students' answers were at Level 4, 13.33 percent at Level 3, 32.66 percent at Level 1, and 46.66 percent at Level 2. The majority of the pupils' answers were deemed to be at Level 2 Crucial Experiment.

Beatrice Mintz (1921-2022): an innovator in embryo research and cancer biology

Beatrice Mintz (1921-2022): an innovator in embryo research and cancer biology

Item-Position Binding Capacity Limits and Word Limits in Working Memory: A Reanalysis of Oberauer ().

Oberauer (2019) suggested that the working memory capacity in word lists only limits the binding of words to serial positions, with no limit for the words themselves. I advocate a word item limit as a broad kind of binding of each word to the current trial. I propose that the word capacity limit can be observed in Oberauer’s data when binding of a word to the trial is crucial (Experiment 2, words drawn from a small pool and often repeated across trials), though probably much less so when this kind of binding is unimportant (Experiment 1, words drawn from a large pool and rarely repeated across trials). In Oberauer’s recognition procedure for lists of 2, 4, 6, or 8 words, the number of words in the response set was varied, including both words from the list (1, 2, 4, 6, or 8 of them) and words that were not from the list (0, 1, 2, or 4 of them). There was also a serial recall procedure. In a re-analysis of the data from Experiment 2, an overlooked item capacity limit was found that affected the distribution of erroneous responses. Specifically, when the correct answer was unknown to the participant (which happened more at longer list lengths), proportionally fewer words from the list were selected as responses; selection of non-list words increased. It is an important theoretical refinement of Oberauer’s position to include evidence of a word item capacity limit when the item-to-trial binding is crucial, as in his Experiment 2.

Kant’s ‘Copernican Revolution’: Toward Rehabilitation of a Concept and Provision of a Framework for the Interpretation of the Critique of Pure Reason (Translated by M.D. Lakhuti)

Against those commentators who consider Kant’s explicit reference to Copernicus’s heliocentric reversal either grossly misleading or simply irrelevant to the revolution in philosophy carried out in the Critique of Pure Reason, it is argued in this paper that Kant’s transcendental idealist inversion of the familiar standpoint of realism and sound common sense fully justifies the talk of a ‘Copernican revolution,’ even if Kant himself never used the expression. It is not just the dominant ‘moving spectator’ motif (or transcendental turn) of the Preface that has to do with Copernicus; both the immediately following ‘crucial experiment’ motif (on the distinction between appearances and things in themselves) and the ‘critical’ motif (regarding self-knowledge and the possibility of synthetic a priori judgments) confirm the aptness of the Copernican analogy. Still, some commentators have stretched the analogy too far; the final section of the paper attempts to determine just how far it may reasonably be said to go.

Doze mitos sobre a Teoria da Relatividade que precisamos superar

No dia 29 de maio se comemora o centenário do eclipse de 1919 que teria “provado” (ou confirmado) a Teoria da Relatividade Geral “criada” por Albert Einstein em 1915. Essa frase bastante comum apresenta vários problemas conceituais, entre eles a ideia de que teorias podem ser provadas e tem criadores; e que os dados do eclipse foram suficientes para confirmar a Relatividade Geral. Depois de cem anos do eclipse, ainda há muitos mitos que rodeiam a Teoria da Relatividade e a figura de Albert Einstein. Nesse artigo apresentamos cinco mitos sobre a teoria da relatividade especial, três mitos sobre a relatividade geral e quatro mitos sobre Einstein, que são constantes em livros didáticos, livros especializados, jornais e obras de popularização da ciência. Para desconstruir cada mito, fazemos uma apresentação histórica e conceitual, que reflete um exame rigoroso de pesquisa na literatura primária e secundária. O objetivo do trabalho não é minimizar a contribuição de Einstein para a relatividade, mas desconstruir o mito produzido em torno do cientista Albert Einstein e apresentar o Einstein histórico e suas posições científicas, bem como discutir como ocorreu a construção da teoria da relatividade e seus desdobramentos, como o programa de Buracos Negros e Ondas Gravitacionais. Também mostramos que a Relatividade não era a única teoria consistente e não resolveu todos os problemas conhecidos de sua época, assim como a sua aceitação não foi imediata e nem se deu por algum experimento crucial (experimentum crucis).

Self-diffusion in high-purity α-Al2O3: Comparison of Ti-doped, Mg-doped and undoped single crystals

Oxygen diffusivity in α-alumina is characterised by a scatter band of about one decade and a half in an Arrhenius diagram. In order to control decisive material parameters the present study is based on high-purity single crystals which were deliberately doped with aliovalent elements (Mg or Ti) and simultaneously annealed in an 18O2 atmosphere (200 mbar at 1650 °C). In such a crucial experiment the diffusivities in undoped and acceptor or donor doped alumina are identical within a factor of about 2. Contradictory findings in the past on the impact of Mg and Ti on the oxygen diffusion can be rationalised due to published similar calculated energies for the most probable dopant incorporation reactions. Al self-diffusion is much more rapid than oxygen diffusion in undoped and Ti-doped α-alumina. In this work we show for the first time that Mg doping drastically reduces the Al diffusivity in α-alumina.

The Duhem-Quine Thesis Reconsidered

Abstract The high point of the falsification of physical theories in a standard view of the philosophy of science is the so-called crucial experiment. This experiment is a kind of manipulated empirical test, which provides the criterion for distinguishing between two rival hypotheses, where one is an acceptable theory due to passing the test, and the other turns out to be an unacceptable theory as it does not pass the test. The crucial experiment was supposed to play a significant role because, in virtue of an empirical disconfirmation of one theory, the experiment was assumed to confirm the other as true. However, in 1906, in La théorie physique, son object et la structure (hereafter quoted in English translation as The Aim and Structure of Physical Theory (1906/1954)), Pierre Duhem famously argued against this view and stated that crucial experiments in physics are impossible as they are necessarily ambiguous and logically incomplete. His contention rested on the claim that, “[a] physical theory is not an explanation [of true reality in itself in virtue of some broad metaphysical ramification of physics]. It is a system of mathematical propositions, deduced from a small number of principles, which aim to represent as simply, as completely, and as accurately as possible a set of experimental laws” (ibid., p. 19). Furthermore, different theories could be equally suitable to represent a given group of experimental laws. And, assuming holism, no hypothesis could be tested in isolation, but merely as a part of a set of an entire scientific theory. The problem which Duhem identified in 1906 was slightly overshadowed and neglected in mainstream philosophy of science until the appearance of a challenging paper by Willard Van Orman Quine published in 1951 and entitled “Two Dogmas of Empiricism”. Quine’s paper caused a revival of interest in Duhem’s original formulation and gave a new impulse towards the problem in the form of the so-called Duhem-Quine thesis. The aim of this paper is to reconsider whether Duhem was right to argue that there are no crucial experiments in physics. In order to assess the validity of the thesis, first, this paper makes an exposition of Duhem’s arguments in their favour, and analyses the major criticisms of this position offered in the subject-literature of Adolf Grünbaum, who explicitly attacked the arguments for the thesis as inconclusive and false. Then, this paper presents possible modes of defence of the Duhem-Quine thesis and argues that the original formulation of the thesis is well qualified and plausible. Finally, this paper offers a pragmatic interpretation of the theory choice.

Perception and Past Experience 50 Years After Kanizsa's (Im)possible Experiment.

In the revolutionary year 1968, the Institute of Psychology of the University of Trieste directed by Gaetano Kanizsa published a collective volume to celebrate the 70th birthday of Cesare L. Musatti. Kanizsa devoted the opening article to the empirical refutation of an argument developed by Musatti in Structure and experience in perceptual phenomenology. Musatti held that the debate between rationalist and empiricist theories of perception was not scientific, since a crucial experiment on the role of past experience is—in principle—impossible. Besides rejecting his mentor’s argument on logical grounds, Kanizsa produced a parade of visual effects to demonstrate that in several conditions (involving object formation and camouflage, Petter’s rule, phenomenal transparency, shape recognition, motion organization) actual perception violates expectations based on familiarity with specific objects. The empirical refutation of expectations based on past experience was recurrent in Kanizsa’s subsequent production and represents a lively topic of current perceptual science, though Musatti’s smile is still here.