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https://www.readbyqxmd.com/read/29305318/behavioral-phenotyping-of-calcium-channel-cacn-subunit-%C3%AE-2%C3%AE-3-knockout-mice-consequences-of-sensory-cross-modal-activation
#1
Julia Landmann, Franziska Richter, Joseph Classen, Angelika Richter, Josef M Penninger, Ingo Bechmann
Sensory cross-activation is still ill-defined and research concerning the consequences of sensory mergence on normal brain function is very limited. Human studies describe behavioral benefits of people with synesthesia- a peculiar form of perception possibly due to cross-modal activation- regarding sensory and memory abilities. Here, we studied behavioral alterations in calcium channel (CACN) subunit α2δ3 knockout (KO) mice exhibiting pain-induced cortical cross-modal activation. Knockout mice exhibited an increased response upon touch of a pinna and impaired audition, while elementary olfaction, vision, somatosensation and motor function were not altered...
January 2, 2018: Behavioural Brain Research
https://www.readbyqxmd.com/read/29259260/musical-pitch-classes-have-rainbow-hues-in-pitch-class-color-synesthesia
#2
Kosuke Itoh, Honami Sakata, Ingrid L Kwee, Tsutomu Nakada
Synesthesia, an anomalous blending of senses in which stimulation of one sensory modality produces sensation in a different modality, provides a unique opportunity to study how multimodal information is represented in the human brain. We investigated how pitch classes (do, re, mi, etc.) are associated with the three dimensions of color (hue, saturation, and value/brightness) in 15 subjects who possessed "pitch class-color synesthesia". Across-subject averaging of reported colors revealed that pitch classes have rainbow hues, beginning with do-red, re-yellow, and so forth, ending with si-violet, accompanied by a decrease in saturation...
December 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29188078/one-shot-synesthesia
#3
Alexandra Kirschner, Danko Nikolić
Synesthesia is commonly thought to be a phenomenon of fixed associations between an outside inducer and a vivid concurrent experience. Hence, it has been proposed that synesthesia occurs due to additional connections in the brain with which synesthetes are born. Here we show that synesthesia can be a much richer and more flexible phenomenon with a capability to creatively construct novel synesthetic experiences as events unfold in people's lives. We describe here cases of synesthetes who occasionally generate novel synesthetic experience, called one-shot synesthesias...
2017: Translational Neuroscience
https://www.readbyqxmd.com/read/29094306/early-sensory-experience-influences-the-development-of-multisensory-thalamocortical-and-intracortical-connections-of-primary-sensory-cortices
#4
Julia U Henschke, Anja M Oelschlegel, Frank Angenstein, Frank W Ohl, Jürgen Goldschmidt, Patrick O Kanold, Eike Budinger
The nervous system integrates information from multiple senses. This multisensory integration already occurs in primary sensory cortices via direct thalamocortical and corticocortical connections across modalities. In humans, sensory loss from birth results in functional recruitment of the deprived cortical territory by the spared senses but the underlying circuit changes are not well known. Using tracer injections into primary auditory, somatosensory, and visual cortex within the first postnatal month of life in a rodent model (Mongolian gerbil) we show that multisensory thalamocortical connections emerge before corticocortical connections but mostly disappear during development...
November 1, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/29052461/beyond-the-subjective-experience-of-colour-an-experimental-case-study-of-grapheme-texture-synesthesia
#5
Hayaki Banno, Hiroki Koga, Hiroki Yamamoto, Jun Saiki
This study was a case investigation of grapheme-texture synestheste TH, a female who subjectively reported experiencing a visual association between grapheme and colour/texture. First, we validated the existence of a synesthetic association in an objective manner. Involuntarily elicited experience is a major hallmark that is common to different types of synesthetes. Our results indicated interference between physical and synesthetic texture, suggesting the involuntary occurrence of synesthetic textural experience...
July 2017: Cognitive Neuropsychology
https://www.readbyqxmd.com/read/28697672/projectors-associators-visual-imagery-and-the-time-course-of-visual-processing-in-grapheme-color-synesthesia
#6
Ben D Amsel, Marta Kutas, Seana Coulson
In grapheme-color synesthesia, seeing particular letters or numbers evokes the experience of specific colors. We investigate the brain's real-time processing of words in this population by recording event-related brain potentials (ERPs) from 15 grapheme-color synesthetes and 15 controls as they judged the validity of word pairs ('yellow banana' vs. 'blue banana') presented under high and low visual contrast. Low contrast words elicited delayed P1/N170 visual ERP components in both groups, relative to high contrast...
August 2, 2017: Cognitive Neuroscience
https://www.readbyqxmd.com/read/28666185/multilevel-analysis-of-individual-differences-in-regularities-of-grapheme-color-associations-in-synesthesia
#7
Daisuke Hamada, Hiroki Yamamoto, Jun Saiki
Grapheme-color synesthesia is a neurological phenomenon where visual perception of letters and numbers stimulates perception of a specific color. Grapheme-color correspondences have been shown to be systematically associated with grapheme properties, including visual shape difference, ordinality, and frequency. However, the contributions of grapheme factors differ across individuals. In this study, we applied multilevel analysis to test whether individual differences in regularities of grapheme-color associations could be explained by individual styles of processing grapheme properties...
June 27, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28643033/the-role-of-sensory-perception-emotionality-and-lifeworld-in-auditory-word-processing-evidence-from-congenital-blindness-and-synesthesia
#8
Judith Papadopoulos, Frank Domahs, Christina Kauschke
Although it has been established that human beings process concrete and abstract words differently, it is still a matter of debate what factors contribute to this difference. Since concrete concepts are closely tied to sensory perception, perceptual experience seems to play an important role in their processing. The present study investigated the processing of nouns during an auditory lexical decision task. Participants came from three populations differing in their visual-perceptual experience: congenitally blind persons, word-color synesthetes, and sighted non-synesthetes...
December 2017: Journal of Psycholinguistic Research
https://www.readbyqxmd.com/read/28607666/synesthesia-and-the-mccollough-effect
#9
V S Ramachandran, Zeve Marcus
Synesthetes, who see printed black letters and numbers as being colored, are thought to have enhanced cross-activation between brain modules for color and form. Since the McCollough effect also results from oriented contours (i.e., form) evoking specific colors, we conjectured that synesthetes may experience an enhanced McCollough effect, and find that this is indeed true.
May 2017: I-Perception
https://www.readbyqxmd.com/read/28597194/a-social-bouba-kiki-effect-a-bias-for-people-whose-names-match-their-faces
#10
David N Barton, Jamin Halberstadt
The "bouba/kiki effect" is the robust tendency to associate rounded objects (vs. angular objects) with names that require rounding of the mouth to pronounce, and may reflect synesthesia-like mapping across perceptual modalities. Here we show for the first time a "social" bouba/kiki effect, such that experimental participants associate round names ("Bob," "Lou") with round-faced (vs. angular-faced) individuals. Moreover, consistent with a bias for expectancy-consistent information, we find that participants like targets with "matching" names, both when name-face fit is measured and when it is experimentally manipulated...
June 8, 2017: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/28587556/methodological-guidelines-to-investigate-altered-states-of-consciousness-and-anomalous-experiences
#11
Alexander Moreira-Almeida, Francisco Lotufo-Neto
Anomalous experiences (AE) (uncommon experiences or one that is believed to deviate from the usually accepted explanations of reality: hallucinations, synesthesia, experiences interpreted as telepathic…) and altered states of consciousness (ASC) have been described in all societies of all ages. Even so, scientists have long neglected the studies on this theme. To study AE and ASC is not necessary to share the beliefs we explore, they can be investigated as subjective experiences and correlated with other data, like any other human experience...
June 2017: International Review of Psychiatry
https://www.readbyqxmd.com/read/28447622/modern-clinical-research-on-lsd
#12
REVIEW
Matthias E Liechti
All modern clinical studies using the classic hallucinogen lysergic acid diethylamide (LSD) in healthy subjects or patients in the last 25 years are reviewed herein. There were five recent studies in healthy participants and one in patients. In a controlled setting, LSD acutely induced bliss, audiovisual synesthesia, altered meaning of perceptions, derealization, depersonalization, and mystical experiences. These subjective effects of LSD were mediated by the 5-HT2A receptor. LSD increased feelings of closeness to others, openness, trust, and suggestibility...
October 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28348537/graphemes-sharing-phonetic-features-tend-to-induce-similar-synesthetic-colors
#13
Mi-Jeong Kang, Yeseul Kim, Ji-Young Shin, Chai-Youn Kim
Individuals with grapheme-color synesthesia experience idiosyncratic colors when viewing achromatic letters or digits. Despite large individual differences in grapheme-color association, synesthetes tend to associate graphemes sharing a perceptual feature with similar synesthetic colors. Sound has been suggested as one such feature. In the present study, we investigated whether graphemes of which representative phonemes have similar phonetic features tend to be associated with analogous synesthetic colors. We tested five Korean multilingual synesthetes on a color-matching task using graphemes from Korean, English, and Japanese orthography...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28276863/when-synesthesia-and-savant-abilities-are-mistaken-for-hallucinations-and-delusions-contribution-of-a-cognitive-approach-for-their-differential-diagnosis
#14
Lucie Bouvet, Jacques-Edouard Barbier, Nia Cason, Serge Bakchine, Nathalie Ehrlé
OBJECTIVE: Schizophrenia is characterized by hallucinations, delusions, disorganized speech and behavior, and other symptoms that cause social or occupational dysfunction. However, some of these symptoms, such as hallucinations and delusions, can be indicative of other phenomena such as synesthesia and savant abilities. The aim of this paper is to highlight how neurological and psychiatric conditions can be confused and how formal neuropsychological evaluations can be necessary to distinguish them...
February 17, 2017: Clinical Neuropsychologist
https://www.readbyqxmd.com/read/28263797/do-graphemes-attract-spatial-attention-in-grapheme-color-synesthesia
#15
G Volberg, A S Chockley, M W Greenlee
Grapheme-color synesthetes perceive concurrent colors for some objectively achromatic graphemes (inducers). Using oscillatory responses in the electroencephalogram, we tested the hypothesis that inducers automatically attract spatial attention and, thus, favor a conscious experience of color. Achromatic inducers and real-colored non-inducers were presented to the left or to the right visual hemifield and orientation judgments were required for subsequently presented Gabor patches. The graphemes were irrelevant for the task so that the related brain response was purely stimulus-driven...
March 3, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28195520/creating-colored-letters-familial-markers-of-grapheme-color-synesthesia-in-parietal-lobe-activation-and-structure
#16
Olympia Colizoli, Jaap M J Murre, H Steven Scholte, Romke Rouw
Perception is inherently subjective, and individual differences in phenomenology are well illustrated by the phenomenon of synesthesia (highly specific, consistent, and automatic cross-modal experiences, in which the external stimulus corresponding to the additional sensation is absent). It is unknown why some people develop synesthesia and others do not. In the current study, we tested whether neural markers related to having synesthesia in the family were evident in brain function and structure. Relatives of synesthetes (who did not have any type of synesthesia themselves) and matched controls read specially prepared books with colored letters for several weeks and were scanned before and after reading using magnetic resonance imaging...
July 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28103755/what-makes-a-better-smeller
#17
REVIEW
Asifa Majid, Laura Speed, Ilja Croijmans, Artin Arshamian
Olfaction is often viewed as difficult, yet the empirical evidence suggests a different picture. A closer look shows people around the world differ in their ability to detect, discriminate, and name odors. This gives rise to the question of what influences our ability to smell. Instead of focusing on olfactory deficiencies, this review presents a positive perspective by focusing on factors that make someone a better smeller. We consider three driving forces in improving olfactory ability: one's biological makeup, one's experience, and the environment...
March 2017: Perception
https://www.readbyqxmd.com/read/28073044/influence-of-the-body-schema-on-mirror-touch-synesthesia
#18
Jared Medina, Carrie DePasquale
Individuals with mirror-touch synesthesia (MTS) report feeling touch on their own body when seeing someone else being touched. We examined how the body schema - an on-line representation of body position in space - is involved in mapping touch from a viewed body to one's own body. We showed 45 mirror-touch synesthetes videos of a hand being touched, varying the location of the viewed touch by hand (left, right), skin surface (palmar, dorsal) and finger (index, ring). Participant hand posture was either congruent or incongruent with the posture of the viewed hand...
March 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/27943645/color-processing-in-synesthesia-what-synesthesia-can-and-cannot-tell-us-about-mechanisms-of-color-processing
#19
Agnieszka B Janik McErlean, Michael J Banissy
Synesthetic experiences of color have been traditionally conceptualized as a perceptual phenomenon. However, recent evidence suggests a role of higher order cognition in the formation of synesthetic experiences. Here, we discuss how synesthetic experiences of color differ from and influence veridical color processing, and how non-perceptual processes such as imagery and color memory might play a role in eliciting synesthetic color experience.
January 2017: Topics in Cognitive Science
https://www.readbyqxmd.com/read/27900674/serotonergic-hallucinogen-induced-visual-perceptual-alterations
#20
Michael Kometer, Franz X Vollenweider
Serotonergic hallucinogens, such as lysergic acid diethylamide (LSD), psilocybin, and N,N-dimethyltryptamine (DMT), are famous for their capacity to temporally and profoundly alter an individual's visual experiences. These visual alterations show consistent attributes despite large inter- and intra-individual variances. Many reports document a common perception of colors as more saturated, with increased brightness and contrast in the environment ("Visual Intensifications"). Environmental objects might be altered in size ("Visual illusions") or take on a modified and special meaning for the subject ("Altered self-reference")...
November 30, 2016: Current Topics in Behavioral Neurosciences
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