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  1. Article ; Online: What Cognitive Neurology Teaches Us about Our Experience of Color.

    Siuda-Krzywicka, Katarzyna / Bartolomeo, Paolo

    The Neuroscientist : a review journal bringing neurobiology, neurology and psychiatry

    2019  Volume 26, Issue 3, Page(s) 252–265

    Abstract: Color provides valuable information about the environment, yet the exact mechanisms explaining how colors appear to us remain poorly understood. Retinal signals are processed in the visual cortex through high-level mechanisms that link color perception ... ...

    Abstract Color provides valuable information about the environment, yet the exact mechanisms explaining how colors appear to us remain poorly understood. Retinal signals are processed in the visual cortex through high-level mechanisms that link color perception with top-down expectations and knowledge. Here, we review the neuroimaging evidence about color processing in the brain, and how it is affected by acquired brain lesions in humans. Evidence from patients with brain-damage suggests that high-level color processing may be divided into at least three modules: perceptual color experience, color naming, and color knowledge. These modules appear to be functionally independent but richly interconnected, and serve as cortical relays linking sensory and semantic information, with the final goal of directing object-related behavior. We argue that the relations between colors and their objects are key mechanisms to understand high-level color processing.
    MeSH term(s) Agnosia/pathology ; Agnosia/physiopathology ; Anomia/pathology ; Anomia/physiopathology ; Cerebral Cortex/pathology ; Cerebral Cortex/physiopathology ; Color Perception/physiology ; Color Vision Defects/pathology ; Color Vision Defects/physiopathology ; Humans ; Visual Pathways/pathology ; Visual Pathways/physiopathology
    Language English
    Publishing date 2019-11-06
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1233753-5
    ISSN 1089-4098 ; 1073-8584
    ISSN (online) 1089-4098
    ISSN 1073-8584
    DOI 10.1177/1073858419882621
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The connectional anatomy of visual mental imagery: evidence from a patient with left occipito-temporal damage.

    Hajhajate, Dounia / Kaufmann, Brigitte C / Liu, Jianghao / Siuda-Krzywicka, Katarzyna / Bartolomeo, Paolo

    Brain structure & function

    2022  Volume 227, Issue 9, Page(s) 3075–3083

    Abstract: Most of us can use our "mind's eye" to mentally visualize things that are not in our direct line of sight, an ability known as visual mental imagery. Extensive left temporal damage can impair patients' visual mental imagery experience, but the critical ... ...

    Abstract Most of us can use our "mind's eye" to mentally visualize things that are not in our direct line of sight, an ability known as visual mental imagery. Extensive left temporal damage can impair patients' visual mental imagery experience, but the critical locus of lesion is unknown. Our recent meta-analysis of 27 fMRI studies of visual mental imagery highlighted a well-delimited region in the left lateral midfusiform gyrus, which was consistently activated during visual mental imagery, and which we called the Fusiform Imagery Node (FIN). Here, we describe the connectional anatomy of FIN in neurotypical participants and in RDS, a right-handed patient with an extensive occipito-temporal stroke in the left hemisphere. The stroke provoked right homonymous hemianopia, alexia without agraphia, and color anomia. Despite these deficits, RDS had normal subjective experience of visual mental imagery and reasonably preserved behavioral performance on tests of visual mental imagery of object shape, object color, letters, faces, and spatial relationships. We found that the FIN was spared by the lesion. We then assessed the connectional anatomy of the FIN in the MNI space and in the patient's native space, by visualizing the fibers of the inferior longitudinal fasciculus (ILF) and of the arcuate fasciculus (AF) passing through the FIN. In both spaces, the ILF connected the FIN with the anterior temporal lobe, and the AF linked it with frontal regions. Our evidence is consistent with the hypothesis that the FIN is a node of a brain network dedicated to voluntary visual mental imagery. The FIN could act as a bridge between visual information and semantic knowledge processed in the anterior temporal lobe and in the language circuits.
    MeSH term(s) Humans ; Temporal Lobe/pathology ; Brain Mapping ; Nerve Net ; Semantics ; Magnetic Resonance Imaging ; Stroke/complications ; Stroke/pathology
    Language English
    Publishing date 2022-05-27
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2273162-3
    ISSN 1863-2661 ; 1863-2653
    ISSN (online) 1863-2661
    ISSN 1863-2653
    DOI 10.1007/s00429-022-02505-x
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  3. Article ; Online: Color Naming and Categorization Depend on Distinct Functional Brain Networks.

    Siuda-Krzywicka, Katarzyna / Witzel, Christoph / Bartolomeo, Paolo / Cohen, Laurent

    Cerebral cortex (New York, N.Y. : 1991)

    2020  Volume 31, Issue 2, Page(s) 1106–1115

    Abstract: Naming a color can be understood as an act of categorization, that is, identifying it as a member of a category of colors that are referred to by the same name. But are naming and categorization equivalent cognitive processes and consequently rely on ... ...

    Abstract Naming a color can be understood as an act of categorization, that is, identifying it as a member of a category of colors that are referred to by the same name. But are naming and categorization equivalent cognitive processes and consequently rely on same neural substrates? Here, we used task and resting-state functional magnetic resonance imaging as well as behavioral measures to identify functional brain networks that modulated naming and categorization of colors. We first identified three bilateral color-sensitive regions in the ventro-occipital cortex. We then showed that, across participants, color naming and categorization response times (RTs) were correlated with different resting state connectivity networks seeded from the color-sensitive regions. Color naming RTs correlated with the connectivity between the left posterior color region, the left middle temporal gyrus, and the left angular gyrus. In contrast, color categorization RTs correlated with the connectivity between the bilateral posterior color regions, and left frontal, right temporal and bilateral parietal areas. The networks supporting naming and categorization had a minimal overlap, indicating that the 2 processes rely on different neural mechanisms.
    MeSH term(s) Adult ; Brain/diagnostic imaging ; Brain/physiology ; Brain Mapping/methods ; Color Perception/physiology ; Female ; Humans ; Magnetic Resonance Imaging/methods ; Male ; Middle Aged ; Nerve Net/diagnostic imaging ; Nerve Net/physiology ; Psychomotor Performance/physiology ; Reaction Time/physiology
    Language English
    Publishing date 2020-09-28
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1077450-6
    ISSN 1460-2199 ; 1047-3211
    ISSN (online) 1460-2199
    ISSN 1047-3211
    DOI 10.1093/cercor/bhaa278
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  4. Article ; Online: The biological bases of colour categorisation: From goldfish to the human brain.

    Siuda-Krzywicka, Katarzyna / Boros, Marianna / Bartolomeo, Paolo / Witzel, Christoph

    Cortex; a journal devoted to the study of the nervous system and behavior

    2019  Volume 118, Page(s) 82–106

    Abstract: How are colour categories related to perception and language? To answer this question, we review research on the neural correlates of colour categories, and categorical responses in preverbal infants and non-human animals. With respect to language, the ... ...

    Abstract How are colour categories related to perception and language? To answer this question, we review research on the neural correlates of colour categories, and categorical responses in preverbal infants and non-human animals. With respect to language, the reviewed findings suggest that colour categorisation often involves automatic language processing. At the same time, evidence from non-human animals, infants, and patients with brain lesions indicates that colour categorisation may also occur in the absence of language. Concerning perception, there is little convincing evidence that the bottom-up processes of colour perception are the origin of colour categories. Instead, colour categorisation might simply build upon the continuous colour perception and interact with perception through the direction of attention to colour differences that are relevant to categorisation. We make three suggestions for future research. First, future research in all areas requires methodological improvements, in particular in stimulus control. Second, future research should overcome the universalist-realist debate and go beyond a simple contrast between perception and language. Third, the link between object colours and colour categories provides an alternative approach that might reveal the ecological origin of colour categories. The ecological approach promises establishing evolutionary and developmental continuity between categorical responses in non-human animals, infants and adult humans.
    MeSH term(s) Animals ; Attention/physiology ; Brain/physiology ; Cognition/physiology ; Color ; Color Perception/physiology ; Goldfish ; Humans ; Language
    Language English
    Publishing date 2019-04-19
    Publishing country Italy
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 280622-8
    ISSN 1973-8102 ; 0010-9452
    ISSN (online) 1973-8102
    ISSN 0010-9452
    DOI 10.1016/j.cortex.2019.04.010
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  5. Article: When practice does not make a perfect - paradoxical learning curve in schizophrenia and bipolar disorder revealed by different serial reaction time task variants.

    Chrobak, Adrian Andrzej / Siuda-Krzywicka, Katarzyna / Soltys, Zbigniew / Bielak, Sylwia / Nowaczek, Dominik / Żyrkowska, Aleksandra / Fafrowicz, Magdalena / Marek, Tadeusz / Pęcherzewska, Ewa / Kużdżał, Jan / Starowicz-Filip, Anna / Gorostowicz, Aleksandra / Dudek, Dominika / Siwek, Marcin

    Frontiers in psychiatry

    2023  Volume 14, Page(s) 1238473

    Abstract: Introduction: Our previous studies identified a paradoxical implicit motor learning curve in schizophrenia (SZ) and bipolar disorder (BD) patients. This study aimed to verify whether those previously observed deficits may be captured by a new version of ...

    Abstract Introduction: Our previous studies identified a paradoxical implicit motor learning curve in schizophrenia (SZ) and bipolar disorder (BD) patients. This study aimed to verify whether those previously observed deficits may be captured by a new version of the ambidextrous serial reaction time task (SRTT), prepared for use in the MRI.
    Methods: This study involved 186 participants. A total of 97 participants (33 BD, 33 SZ, and 31 healthy controls, HCs) completed the original, unlimited time response variant of SRTT. A total of 90 individuals (30 BD, 30 SZ, and 30 HCs) underwent a newer, limited response time version of this procedure.
    Results: There was no significant difference in terms of implicit motor learning indices between both limited and unlimited response time SRTT. Compared to HCs, SZ, and BD patients presented decreased indices of implicit motor learning. Both clinical groups showed a paradoxical learning pattern that differed significantly from the HCs. Moreover, in the SZ group, the pattern depended on the hand performing SRTT.
    Discussion: The limited response time SRTT variant allowed us to replicate the findings of disrupted implicit motor learning in SZ and BD. The use of this paradigm in further neuroimaging studies may help to determine the neuronal underpinnings of this cognitive dysfunction in the abovementioned clinical groups.
    Language English
    Publishing date 2023-09-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2564218-2
    ISSN 1664-0640
    ISSN 1664-0640
    DOI 10.3389/fpsyt.2023.1238473
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  6. Article ; Online: When colours split from objects: The disconnection of colour perception from colour language and colour knowledge.

    Siuda-Krzywicka, Katarzyna / Witzel, Christoph / Taga, Myriam / Delanoe, Marine / Cohen, Laurent / Bartolomeo, Paolo

    Cognitive neuropsychology

    2019  Volume 37, Issue 5-6, Page(s) 325–339

    Abstract: We investigated object-colour knowledge in RDS, a patient with impaired colour naming after a left occipito-temporal stroke. RDS's colour perception, object naming and verbal colour-knowledge (the ability to verbally say the typical colour of an object) ... ...

    Abstract We investigated object-colour knowledge in RDS, a patient with impaired colour naming after a left occipito-temporal stroke. RDS's colour perception, object naming and verbal colour-knowledge (the ability to verbally say the typical colour of an object) were relatively spared. RDS was also able to state if an object was appropriately coloured or not. However, he could neither match colour names to coloured objects, nor match colour patches to grey-scale objects. Thus, RDS's colour-naming deficit was associated with an impaired ability to conceptually relate visually presented object shapes and colours. These results suggest that objects in their typical colour are processed holistically in the visual modality, and that abilities important for colour naming may also be involved in abstracting colours from visual objects. We discuss these findings in the context of developmental psychology and linguistic anthropology, and propose a model of neuro-functional organization of object-colour knowledge.
    MeSH term(s) Color/standards ; Humans ; Language ; Male ; Middle Aged
    Language English
    Publishing date 2019-09-03
    Publishing country England
    Document type Case Reports ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 226406-7
    ISSN 1464-0627 ; 0264-3294
    ISSN (online) 1464-0627
    ISSN 0264-3294
    DOI 10.1080/02643294.2019.1642861
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  7. Article: The biological bases of colour categorisation

    Siuda-Krzywicka, Katarzyna / Boros, Marianna / Bartolomeo, Paolo / Witzel, Christoph

    Cortex

    From goldfish to the human brain

    2019  Volume 118, Page(s) 82–106

    Abstract: Abstract not released by ... ...

    Title translation Die biologischen Grundlagen der Farbkategorisierung: Vom Goldfisch bis zum menschlichen Gehirn (DeepL)
    Abstract Abstract not released by publisher
    Keywords Animal Cognition ; Brain ; Classification (Cognitive Process) ; Cognitive Development ; Color Perception ; Farbwahrnehmung ; Gehirn ; Klassifikation (kognitiver Prozess) ; Kognition bei Tieren ; Kognitive Entwicklung ; Language ; Sprache
    Language English
    Document type Article
    ZDB-ID 280622-8
    ISSN 1973-8102 ; 0010-9452
    ISSN (online) 1973-8102
    ISSN 0010-9452
    DOI 10.1016/j.cortex.2019.04.010
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  8. Article: When colours split from objects

    Siuda-Krzywicka, Katarzyna / Witzel, Christoph / Taga, Myriam / Delanoe, Marine / Cohen, Laurent / Bartolomeo, Paolo

    Cognitive Neuropsychology

    The disconnection of colour perception from colour language and colour knowledge

    2020  Volume 37, Issue 5-6, Page(s) 325–339

    Abstract: We investigated object-colour knowledge in RDS, a patient with impaired colour naming after a left occipito-temporal stroke. RDS's colour perception, object naming and verbal colour-knowledge (the ability to verbally say the typical colour of an object) ... ...

    Title translation Wenn sich Farben von Objekten abspalten: Die Trennung der Farbwahrnehmung von Farbsprache und Farbwissen
    Abstract We investigated object-colour knowledge in RDS, a patient with impaired colour naming after a left occipito-temporal stroke. RDS's colour perception, object naming and verbal colour-knowledge (the ability to verbally say the typical colour of an object) were relatively spared. RDS was also able to state if an object was appropriately coloured or not. However, he could neither match colour names to coloured objects, nor match colour patches to grey-scale objects. Thus, RDS's colour-naming deficit was associated with an impaired ability to conceptually relate visually presented object shapes and colours. These results suggest that objects in their typical colour are processed holistically in the visual modality, and that abilities important for colour naming may also be involved in abstracting colours from visual objects. We discuss these findings in the context of developmental psychology and linguistic anthropology, and propose a model of neuro-functional organization of object-colour knowledge.
    Keywords Achromatic Color ; Achromatische Farbe ; Benennen ; Brain Damage ; Brain Lesions (Disorders) ; Cognitive Impairment ; Color Perception ; Farbwahrnehmung ; Form and Shape Perception ; Formwahrnehmung ; Hirnläsionen (Störungen) ; Hirnschädigung ; Kognitive Beeinträchtigung ; Naming ; Object Recognition ; Objekterkennung ; Visual Discrimination ; Visual Perception ; Visuelle Diskrimination ; Visuelle Wahrnehmung
    Language English
    Document type Article
    ZDB-ID 226406-7
    ISSN 1464-0627 ; 0264-3294
    ISSN (online) 1464-0627
    ISSN 0264-3294
    DOI 10.1080/02643294.2019.1642861
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  9. Article ; Online: Cerebral venous thrombosis due to vaccine-induced immune thrombotic thrombocytopenia after a second ChAdOx1 nCoV-19 dose.

    Krzywicka, Katarzyna / van de Munckhof, Anita / Zimmermann, Julian / Bode, Felix J / Frisullo, Giovanni / Karapanayiotides, Theodoros / Pötzsch, Bernd / Sánchez van Kammen, Mayte / Heldner, Mirjam R / Arnold, Marcel / Kremer Hovinga, Johanna A / Ferro, José M / Aguiar de Sousa, Diana / Coutinho, Jonathan M

    Blood

    2022  Volume 139, Issue 17, Page(s) 2720–2724

    MeSH term(s) COVID-19 Vaccines/adverse effects ; ChAdOx1 nCoV-19 ; Humans ; Thrombocytopenia ; Thrombosis ; Vaccination ; Vaccines ; Venous Thrombosis/etiology
    Chemical Substances COVID-19 Vaccines ; Vaccines ; ChAdOx1 nCoV-19 (B5S3K2V0G8)
    Language English
    Publishing date 2022-03-09
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 80069-7
    ISSN 1528-0020 ; 0006-4971
    ISSN (online) 1528-0020
    ISSN 0006-4971
    DOI 10.1182/blood.2021015329
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  10. Article ; Online: Braille in the Sighted: Teaching Tactile Reading to Sighted Adults.

    Bola, Łukasz / Siuda-Krzywicka, Katarzyna / Paplińska, Małgorzata / Sumera, Ewa / Hańczur, Paweł / Szwed, Marcin

    PloS one

    2016  Volume 11, Issue 5, Page(s) e0155394

    Abstract: Blind people are known to have superior perceptual abilities in their remaining senses. Several studies suggest that these enhancements are dependent on the specific experience of blind individuals, who use those remaining senses more than sighted ... ...

    Abstract Blind people are known to have superior perceptual abilities in their remaining senses. Several studies suggest that these enhancements are dependent on the specific experience of blind individuals, who use those remaining senses more than sighted subjects. In line with this view, sighted subjects, when trained, are able to significantly progress in relatively simple tactile tasks. However, the case of complex tactile tasks is less obvious, as some studies suggest that visual deprivation itself could confer large advantages in learning them. It remains unclear to what extent those complex skills, such as braille reading, can be learnt by sighted subjects. Here we enrolled twenty-nine sighted adults, mostly braille teachers and educators, in a 9-month braille reading course. At the beginning of the course, all subjects were naive in tactile braille reading. After the course, almost all were able to read whole braille words at a mean speed of 6 words-per-minute. Subjects with low tactile acuity did not differ significantly in braille reading speed from the rest of the group, indicating that low tactile acuity is not a limiting factor for learning braille, at least at this early stage of learning. Our study shows that most sighted adults can learn whole-word braille reading, given the right method and a considerable amount of motivation. The adult sensorimotor system can thus adapt, to some level, to very complex tactile tasks without visual deprivation. The pace of learning in our group was comparable to congenitally and early blind children learning braille in primary school, which suggests that the blind's mastery of complex tactile tasks can, to a large extent, be explained by experience-dependent mechanisms.
    MeSH term(s) Adult ; Blindness ; Female ; Humans ; Learning ; Male ; Middle Aged ; Perception ; Reading ; Sensory Aids ; Touch ; Young Adult
    Language English
    Publishing date 2016-05-17
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0155394
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