Results for 'Sami Pihlstörm'

649 found
Order:
  1. Size adaptation: Do you know it when you see it?Sami Yousif & Sam Clarke - manuscript
    The visual system adapts to a wide range of visual features, from lower-level features like color and motion to higher-level features like causality and, perhaps, number. According to some, adaptation is a strictly perceptual phenomenon, such that the presence of adaptation licenses the claim that a feature is truly perceptual in nature. Given the theoretical importance of claims about adaptation, then, it is important to understand exactly when the visual system does and does not exhibit adaptation. Here, we take as (...)
    Direct download  
     
    Export citation  
     
    Bookmark  
  2. Number adaptation: A critical look.Sami R. Yousif, Sam Clarke & Elizabeth M. Brannon - 2024 - Cognition 249 (C):1-17.
    It is often assumed that adaptation — a temporary change in sensitivity to a perceptual dimension following exposure to that dimension — is a litmus test for what is and is not a “primary visual attribute”. Thus, papers purporting to find evidence of number adaptation motivate a claim of great philosophical significance: That number is something that can be seen in much the way that canonical visual features, like color, contrast, size, and speed, can. Fifteen years after its reported discovery, (...)
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  3. Logical Empiricism and Pragmatism.Sami Pihlström, Friedrich Stadler & Niels Weidtmann (eds.) - 2017 - Vienna: Springer.
    No categories
    Direct download  
     
    Export citation  
     
    Bookmark  
  4.  26
    Embedded ethics: a proposal for integrating ethics into the development of medical AI.Alena Buyx, Sami Haddadin, Ruth Müller, Daniel Tigard, Amelia Fiske & Stuart McLennan - 2022 - BMC Medical Ethics 23 (1):1-10.
    The emergence of ethical concerns surrounding artificial intelligence (AI) has led to an explosion of high-level ethical principles being published by a wide range of public and private organizations. However, there is a need to consider how AI developers can be practically assisted to anticipate, identify and address ethical issues regarding AI technologies. This is particularly important in the development of AI intended for healthcare settings, where applications will often interact directly with patients in various states of vulnerability. In this (...)
    No categories
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark   10 citations  
  5.  20
    Judgments of spatial extent are fundamentally illusory: ‘Additive-area’ provides the best explanation.Sami R. Yousif, Richard N. Aslin & Frank C. Keil - 2020 - Cognition 205 (C):104439.
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   4 citations  
  6.  17
    Abstract morphemes and lexical representation: the CV-Skeleton in Arabic.Sami Boudelaa & William D. Marslen-Wilson - 2004 - Cognition 92 (3):271-303.
    Overlaps in form and meaning between morphologically related words have led to ambiguities in interpreting priming effects in studies of lexical organization. In Semitic languages like Arabic, however, linguistic analysis proposes that one of the three component morphemes of a surface word is the CV-Skeleton, an abstract prosodic unit coding the phonological shape of the surface word and its primary syntactic function, which has no surface phonetic content (McCarthy, J. J. (1981). A prosodic theory of non-concatenative morphology, Linguistic Inquiry, 12 (...)
    Direct download (5 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  7.  43
    Morphological units in the Arabic mental lexicon.Sami Boudelaa & William D. Marslen-Wilson - 2001 - Cognition 81 (1):65-92.
    Direct download (5 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  8.  93
    Hansonian and Harmanian abduction as models of discovery.Sami Paavola - 2006 - International Studies in the Philosophy of Science 20 (1):93 – 108.
    In this article, I compare two varieties of abduction as reconstructive models for analysing discovery. The first is 'Hansonian abduction', which is based on N. R. Hanson's formulations of abduction. The other is 'Harmanian abduction', the Inference to the Best Explanation (IBE) model, formulated especially by Gilbert Harman. Peter Lipton has analysed processes of discovery on the basis of his developed form of Harmanian abduction. I argue that Hansonian abduction would, however, be a more apt model for this purpose. As (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark   29 citations  
  9.  23
    Metaphors We Love By: The Shift from Animal to Fruit Metaphors in Classical Arabic Ghazal.Sami Chatti - 2023 - Metaphor and Symbol 38 (2):184-197.
    Classical Arabic poetry is replete with animal and fruit metaphors commonly used for endearment purposes. The comparative analysis of love metaphors in classical ghazal shows, however, a shift in the poetics of love from the use of animal metaphors in Badi poetry to the occurrence of fruit imagery in Bedouin ghazal. Based on a selection of classical Arabic love poetry, the paper traces the journey of love and sexuality to illustrate the conceptual change from the prevalence of the gazelle metaphor (...)
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  10.  29
    The one-is-more illusion: Sets of discrete objects appear less extended than equivalent continuous entities in both space and time.Sami R. Yousif & Brian J. Scholl - 2019 - Cognition 185 (C):121-130.
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   4 citations  
  11.  32
    A Conceptual Analysis of Perspective Taking in Support of Socioscientific Reasoning.Sami Kahn & Dana L. Zeidler - 2019 - Science & Education 28 (6-7):605-638.
    Perspective taking is a critical yet tangled construct that is used to describe a range of psychological processes and that is applied interchangeably with related constructs. The resulting ambiguity is particularly vexing in science education, where although perspective taking is recognized as critical to informed citizens’ ability to negotiate scientifically related societal issues, or socioscientific issues via socioscientific reasoning, the precise nature of perspective taking remains elusive. To operationalize perspective taking, a theoretical conceptual analysis was employed and used to position (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  12.  55
    Peircean Abduction: Instinct or Inference?Sami Paavola - 2005 - Semiotica 2005 (153 - 1/4):131-154.
  13.  11
    Notas sobre la infancia y la literatura desde las filosofías de Deleuze- Guattari y Schérer- Hocquenghem.Samy Z. Reyes García - 2023 - Revista de Filosofía (México) 55 (154):248-295.
    El presente trabajo aborda el problema de la infancia dentro de la filosofía mo- derna y contemporánea, así como la relación conceptual que ésta tiene con la literatura, en especial, con lo que se analiza como novela infantil y novela familiar. Con apoyo de algunas ideas de Deleuze y Guattari, así como de Schérer y Hocquenghem, a la par de fragmentos de novelas, se busca establecer una crítica a las nociones de ontología y libertad establecidas en torno a la infancia (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  14.  14
    Logic Tensor Networks.Samy Badreddine, Artur D'Avila Garcez, Luciano Serafini & Michael Spranger - 2022 - Artificial Intelligence 303 (C):103649.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  15.  50
    The social dynamics of secrecy: Rethinking information and privacy through Georg Simmel.Sami Coll - 2012 - International Review of Information Ethics 17:07.
    This article argues that Georg Simmel's ideas on secrecy can shed new light on current debates around the relevance or otherwise of privacy as a protection against surveillance interventions. It suggests an interactional approach to privacy, and considers it as a dynamic process which redefines the boundary between what information should be disclosed and what information should be concealed in every social interaction. Simmel argues that this "natural" process relies on the identification of the interlocutor: her psychological/emotional involvement in the (...)
    Direct download  
     
    Export citation  
     
    Bookmark  
  16.  93
    Three Abductive Solutions to the Meno Paradox – with Instinct, Inference, and Distributed Cognition.Sami Paavola & Kai Hakkarainen - 2005 - Studies in Philosophy and Education 24 (3):235-253.
    This article analyzes three approaches to resolving the classical Meno paradox, or its variant, the learning paradox, emphasizing Charles S. Peirce’s notion of abduction. Abduction provides a way of dissecting those processes where something new, or conceptually more complex than before, is discovered or learned. In its basic form, abduction is a “weak” form of inference, i.e., it gives only tentative suggestions for further investigation. But it is not too weak if various sources of clues and restrictions on the abductive (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark   15 citations  
  17.  11
    Involuntary memories are not déjà vu.Sami Gülgöz & Irem Ergen - 2023 - Behavioral and Brain Sciences 46:e364.
    The proposed framework can benefit from integrating predictive processing into the explanation of déjà vu which corresponds to interrupted prediction. Déjà vu is also accompanied by familiarity. However, considerable ambiguity is inherent in familiarity, which necessitates elaboration of this construct. Research findings on involuntary autobiographical memories and déjà vu show discrepancies, and clustering these constructs can be counterproductive for research.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  18.  9
    Using space to remember: Short-term spatial structure spontaneously improves working memory.Sami R. Yousif, Monica D. Rosenberg & Frank C. Keil - 2021 - Cognition 214 (C):104748.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  19.  20
    The differential time course for consonant and vowel processing in Arabic: implications for language learning and rehabilitation.Sami Boudelaa - 2014 - Frontiers in Psychology 5.
    Direct download (5 more)  
     
    Export citation  
     
    Bookmark   1 citation  
  20.  11
    Christian-Muslim dialogue in Egypt.Samy Fawzy - 2000 - Transformation: An International Journal of Holistic Mission Studies 17 (1):34-36.
    No categories
    Direct download  
     
    Export citation  
     
    Bookmark  
  21.  16
    Borel ideals vs. Borel sets of countable relations and trees.Samy Zafrany - 1989 - Annals of Pure and Applied Logic 43 (2):161-195.
  22.  13
    Oblique warping: A general distortion of spatial perception.Sami R. Yousif & Samuel D. McDougle - 2024 - Cognition 247 (C):105762.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  23.  72
    The place and function of doubt in the philosophies of Descartes and al-ghazālī.Sami M. Najm - 1966 - Philosophy East and West 16 (3/4):133-141.
  24.  23
    The dangers of mental health promotion in schools.Sami Timimi & Zoe Timimi - 2022 - Journal of Philosophy of Education 56 (1):12-21.
    Journal of Philosophy of Education, Volume 56, Issue 1, Page 12-21, February 2022.
    No categories
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark  
  25.  20
    A semi-coherent interface with nanoledges intersecting the free surface of an elastic half-space.Sami Dhouibi, Salem Neily, Sami Youssef & Roland Bonnet - forthcoming - Philosophical Magazine:1-17.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  26.  20
    Adaptive Integral-Based Robust Q-S Synchronization and Parameter Identification of Nonlinear Hyperchaotic Complex Systems.Sami Ud Din, Muhammad Rafiq Mufti, Humaira Afzal, Majid Ali & Muhammad Abdul Moiz Zia - 2021 - Complexity 2021:1-17.
    This communique presents the Q-S synchronization of two nonidentical complex nonlinear hyperchaotic systems with unknown parameters. An adaptive controller based on adaptive integral sliding mode control and parameter update laws are designed to realize the synchronization and parameter identification to a given map vector. The aforementioned strategy’s employment demands the transformation of a system into a specific structure containing a nominal part and some unknown terms. An integral sliding mode controller is used to stabilize the error system by designing nominal (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  27. Religious fundamentalism in Asia.B. D'Sami - 2000 - Journal of Dharma 25 (3-4):369-375.
    No categories
     
    Export citation  
     
    Bookmark  
  28. Mawsūʻat muṣṭalaḥāt al-Imām Fakhr al-Dīn al-Rāzī.Samīḥ Dughaym - 2000 - Bayrūt: Maktabat Lubnān Nāshirūn.
  29.  46
    Diagrams, iconicity, and abductive discovery.Sami Paavola - 2011 - Semiotica 2011 (186):297-314.
    In this article, the role of abductive reasoning within Peirce's diagrammatic reasoning is discussed. Both abduction and diagrammatic reasoning bring in elements of discovery but it is not clear if abduction should be a part of a fully developed diagrammatic system or not for Peirce. This relates to Peirce's way of interpreting abduction in his later writings. Iconicity and perceptual elements as a basis for discoveries are analyzed, both in deductive and abductive reasoning. At the end, the role of modern (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  30.  5
    Sergius of Reshaina: Introduction to Aristotle and His categories, Addressed to Philotheos.Sami Aydin - 2016 - Boston: Brill. Edited by Sami Aydin & Sergius.
    Sergius of Reshaina’s Syriac exposition of Aristotle’s _Categories_, with its discussion on substance, quantity, quality, relatives and the other categories, but also the teaching on space from the _Physics_, is presented here in a critical edition with an English translation.
    Direct download  
     
    Export citation  
     
    Bookmark   1 citation  
  31.  8
    Not Yet.Sami Sjöberg - 2012 - Angelaki 17 (3):55-63.
    Rien, c’est ce qu’il faut: supporter l’insupportable rien. Maurice Blanchot Subjectivity is undoubtedly a central area of philosophical investigation. In 1984 Emmanuel Levinas (1906–95) described h...
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark  
  32.  13
    Magna Carta And The Roman Law Tradition.Sami Mehmeti - 2015 - Seeu Review 11 (1):139-144.
    Magna Carta is one of the most important illustrations of the exceptionalism of English common law. Within a completely feudal framework it gave the clearest possible articulation to the concept of the rule of law and at the same time it also showed that there were certain basic rights which every freeman enjoyed without any specific conferment by the king. From English perspective, continental European law after the process of the reception of Roman law was commonly regarded to be apart (...)
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  33.  15
    The influence of canon law on ius commune in its formative period.Sami Mehmeti - 2015 - Seeu Review 11 (2):153-164.
    In the Medieval period, Roman law and canon law formed ius commune or the common European law. The similarity between Roman and canon law was that they used the same methods and the difference was that they relied on different authoritative texts. In their works canonists and civilists combined the ancient Greek achievements in philosophy with the Roman achievements in the field of law. Canonists were the first who carried out research on the distinctions between various legal sources and systematized (...)
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  34.  21
    The Impact of the COVID-19 Pandemic on Domestic Violence-Psychological Consequences, the Legal Framework and its Treatment in the Republic of North Macedonia.Sami Mehmeti, Emine Zendeli, Arta Selmani-Bakiu & Hatixhe Islami - 2020 - Seeu Review 15 (1):121-141.
    In this paper the authors present the psychological consequences of social isolation on domestic violence during the Covid-19 pandemic as well as the legal framework in the RNM on addressing the phenomenon of domestic violence. In this age of globalization and drive for material conformity, family life is quite difficult to cope with. This “war” for material comfort during the pandemic, has strained and stressed many families as a result of the created circumstances. Public safety measures, including physical distance and (...)
    No categories
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark  
  35.  32
    Abduction with Dialogical and Trialogical Means.Sami Paavola, Kai Hakkarainen & Matti Sintonen - 2006 - Logic Journal of the IGPL 14 (2):137-150.
    In this paper we maintain that abductive inferential processes should be embedded to a more general outlook on human cognition. Abduction has clear a.nities to the so-called interrogative model of inquiry in which inquiry and reasoning are conceptualized as a dialogue. We think, in addition, that dialogicality must be broadened to a “trialogical” framework which means a threefold relationship with mediating artefacts where the inquirer, other inquirers , and the object of knowledge are inextricably bound up with each other in (...)
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark   5 citations  
  36. Recent reinterpretations of the transcendental.Sami Pihlström - 2004 - Inquiry: An Interdisciplinary Journal of Philosophy 47 (3):289-314.
    This essay examines critically a number of characteristics of transcendental philosophy. The question, ?What, if anything, distinguishes transcendental philosophy and transcendental arguments from other types of philosophy and argument??, is given a negative answer: nothing, no essential thing, demarcates transcendental argumentation or philosophy from other kinds of philosophical reflection. In particular, argumentative structure alone is not a defining feature of transcendental philosophy. Illustrative examples of recent debates on the meaning and philosophical relevance of the ?transcendental? are discussed in the essay: (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark   14 citations  
  37.  64
    An exploratory study of the personal value systems of city managers.Sami M. Abbasi & Kenneth W. Hollman - 1987 - Journal of Business Ethics 6 (1):45 - 53.
    Little attention has been given by researchers in organizational behavior to the study of public managers' values and how these values affect their managerial behavior. Therefore, the major objective of this study was to identify the personal value systems and value profiles of public managers, and to systematically examine and discuss the relationship between personal values and related organizational behavior including decision making. The significance of the findings for public policy is briefly discussed, and the need for future research is (...)
    Direct download (4 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  38.  36
    Using Statistical Models of Morphology in the Search for Optimal Units of Representation in the Human Mental Lexicon.Sami Virpioja, Minna Lehtonen, Annika Hultén, Henna Kivikari, Riitta Salmelin & Krista Lagus - 2018 - Cognitive Science 42 (3):939-973.
    Determining optimal units of representing morphologically complex words in the mental lexicon is a central question in psycholinguistics. Here, we utilize advances in computational sciences to study human morphological processing using statistical models of morphology, particularly the unsupervised Morfessor model that works on the principle of optimization. The aim was to see what kind of model structure corresponds best to human word recognition costs for multimorphemic Finnish nouns: a model incorporating units resembling linguistically defined morphemes, a whole-word model, or a (...)
    No categories
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  39.  41
    On analytic filters and prefilters.Samy Zafrany - 1990 - Journal of Symbolic Logic 55 (1):315-322.
    We show that every analytic filter is generated by a Π 0 2 prefilter, every Σ 0 2 filter is generated by a Π 0 1 prefilter, and if $P \subseteq \mathscr{P}(\omega)$ is a Σ 0 2 prefilter then the filter generated by it is also Σ 0 2 . The last result is unique for the Borel classes, as there is a Π 0 2 -complete prefilter P such that the filter generated by it is Σ 1 1 -complete. (...)
    Direct download (8 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  40. The Impact of Management Requirements and Operations of Computerized Management Information Systems to Improve Performance (Practical Study on the employees of the company of Gaza Electricity Distribution).Samy S. Abu Naser & Mazen J. Al Shobaki - 2016 - Al-Azhar University, Gaza 1 (1):1-28.
    The research aims to identify the impact of the management requirements on operating of computerized management information systems to improve performance, and discuss the perceptions of respondents to develop the performance of employees in the Gaza Electricity Distribution Company, the researchers used the stratified sample method, (360) questionnaires were distributed on the study sample, (306) questionnaires were recoved with a percentage of (85%). The most important findings of the study: computerized MI have a positive impact on the development of performance (...)
    Direct download  
     
    Export citation  
     
    Bookmark   3 citations  
  41.  9
    Creativity in continuity: legal treatises (al-rasāʾil al-fiqhiyya) in Islamic law.Samy Ayoub - 2022 - Journal of Islamic Studies 34 (3):305-339.
    This article explores how legal treatises (rasāʾil) were essential sites for the development and expansion of Islamic legal schools’ (madhāhib) positions. The rasāʾil, along with legal dicta (fatāwā)—besides legal commentaries (shurūḥ) and manuals (mutūn)—were among the prime loci where jurists contended with rapid social, political, and economic changes. Although these legal treatises were written to address specific sociolegal issues, I argue that the treatise—as a separate genre—provided a creative space for jurists to reaffirm, restate, or advance a new opinion in (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  42.  7
    Western Mass Media Hegemony over the Third World.Sami Alrabaa - 1986 - Communications 12 (1):7-20.
    Direct download  
     
    Export citation  
     
    Bookmark  
  43.  7
    Consumer Rights Paradigm: Development of the Construct in the Jordanian Context.Sami Alsmadi & Ibrahim Alnawas - 2019 - Journal of Business Ethics 159 (3):777-794.
    Due to the lack of empirical measures of consumer rights in developing countries in particular, this research aimed to tackle this issue in the context of Jordan. The research adopted a triangulated methodology of initial inductive research work followed by a deductive research approach, implemented empirically. Data were collected from 660 consumers, using a mall intercept method. Multiple statistical techniques were employed for data analysis, using SPSS-23 and a structural equation model. Three key findings emerged from the current research work. (...)
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  44. Marketing Research Ethics: Researcher’s Obligations toward Human Subjects.Sami Alsmadi - 2008 - Journal of Academic Ethics 6 (2):153-160.
    This paper addresses the growing concern over violation of research ethics in marketing, in particular rights of human subjects in fieldwork, notably the right to informed consent; right to privacy and confidentiality; and right not to be deceived or harmed as a result of participation in a research. The paper highlights the interaction of the three main parties involved in most marketing research: the sponsoring organization (client or user), researcher, and participant in the survey, focusing on researcher’s ethical responsibilities in (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark  
  45.  53
    Amiri Baraka’s Repertory Theatre Revisited.Samy Azouz - 2009 - Radical Philosophy Review 12 (1-2):21-39.
    The turbulent 1960s in America testifies to the artistic and intellectual need and move beyond the liberal cult of fantasy and inaction. Amiri Baraka (formerly LeRoi Jones) views the social and political reality in its dynamism, and not in its immutability or stasis. Black art, within a repressive society, must be perceived as an arm, a weapon and not a means of banter or fun. Werner Sollors considers him as the engagé artist par excellence. The political art that Baraka espouses (...)
    Direct download (3 more)  
     
    Export citation  
     
    Bookmark  
  46.  12
    Droit musulman et société au Sahara prémoderne: La justice islamique dans les oasis du Grand Touat (Algérie) aux XVIIe–XIXe siècles. By Ismail Warscheid.Sami Bargaoui - 2022 - Journal of the American Oriental Society 140 (1).
    Droit musulman et société au Sahara prémoderne: La justice islamique dans les oasis du Grand Touat aux XVIIe–XIXe siècles. By Ismail Warscheid. Studies in the History and Society of the Maghrib, vol. 9. Leiden: Brill, 2017. Pp. xii + 303. $93, €80.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  47.  13
    Güncel Türkçe Sözlük Kullanıcı Dostu mu?Sami Baskin - 2016 - Journal of Turkish Studies 11 (Volume 11 Issue 10):59-59.
    No categories
    Direct download  
     
    Export citation  
     
    Bookmark  
  48.  49
    Islamic Naturalism and Mysticism: A Philosophic Study of Ibn Tufayl's Hayy Bin Yaqzan.Sami S. Hawi - 1974 - Philosophy and Phenomenological Research 35 (3):433-434.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark   2 citations  
  49.  11
    Numerosity, area-osity, object-osity? Oh my.Sami R. Yousif - 2021 - Behavioral and Brain Sciences 44.
    There is ongoing debate about whether number is perceived directly. Clarke and Beck suggest that what plagues this debate is a lack of shared understanding about what it means to perceive number in the first place. I agree. I argue that the perception of number is held to a different standard than, say, the perception of objecthood; considering this, I explore what it might mean for the number system to represent rational numbers.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
  50.  14
    Quantity perception: The forest and the trees.Sami R. Yousif & Frank C. Keil - 2022 - Cognition 229 (C):105074.
    Direct download (2 more)  
     
    Export citation  
     
    Bookmark  
1 — 50 / 649