17 research outputs found
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Emotionally mediated synaesthesia
This study reports a synaesthete, GW, who experiences synaesthetic colours in response to a limited range of stimuli-namely those that have an emotional connotation. GW is significantly more consistent than a group of controls, and shows a Stroop-like congruency effect when the text colour differs from that reported for her synaesthetic photisms. The names of people who are known personally to GW are more likely to induce a synaesthetic colour than names referring to people with whom she is not personally acquainted and other categories of word (including colour names themselves). This feature resembles a number of reports in the historical literature on synaesthesia. This is explained by the fact that these stimuli are more likely to elicit an emotional response. In support of this, other words that have an emotional connotation (e.g., "love") have a tendency to elicit a synaesthetic response. The valence of the emotion (positive vs. negative) may have some role to play in determining the colour of the stimulus. It is concluded that emotion-colour synaesthesia is a genuine, if unusual, form of synaesthesia
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Cognitive Neuroscience: Critical Concepts
Standing at the junction of psychology, neuroscience, and biology, cognitive neuroscience seeks to provide brain-based accounts of mental functions such as language, memory, perception, action, emotions, and decision-making. Its emergence as a coherent discipline came about relatively recently through the amalgamation of techniques that had already been in existence (such as research into the effects of brain lesion on cognition, and electrical recordings of the brain) with newly established techniques (principally brain-imaging methods), originally developed for medical diagnostic purposes. As cognitive neuroscience flourishes as never before, this new title in Psychology PressÂżs Major Works series, Critical Concepts in Psychology, meets the need for an authoritative reference work to make sense of the subjectÂżs already vast literature and the continuing explosion in research output. Edited by a prominent scholar, and the author of the fieldÂżs leading student textbook, Cognitive Neuroscience is a four-volume collection of foundational and contemporary contributions. The four volumes are divided into eight principal sections: History, Methods, and Key Concepts; Developmental Cognitive Neuroscience; Perception and Attention; Action; Learning and Memory; Language; Executive Functions and Decision-Making; and Emotions and Social Neuroscience. The collection is also fully indexed and has a comprehensive introduction, newly written by the editors, which places the collected material in its historical, intellectual, and practical context. It is an essential work of reference and is destined to be valued by scholars and students of cognitive neuroscience as a vital one-stop research tool
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Fibromyalgia is linked to increased subjective sensory sensitivity across multiple senses
Changes in subjective sensory sensitivity – reporting sensory stimuli as being atypically intense or weak – are a transdiagnostic symptom of several disorders. The present study documents for the first time the sensory sensitivity profile of fibromyalgia, taking a questionnaire measure that asks about different sensory modalities and both hyper- and hyposensitivity (the Glasgow Sensory Questionnaire, GSQ). The fibromyalgia group had higher overall scores on this measure. This was linked more strongly to sensory hypersensitivity which was pervasive across all senses that were surveyed. Although differences in hyposensitivity were found these were sporadic (perhaps linked to the symptoms of fibromyalgia itself) and did not resemble the pattern documented for autism (e.g. self-stimulating and repetitive behaviours were not a feature of fibromyalgia). We suggest that individual differences in subjective sensory hypersensitivity may be a multisensory dispositional trait linked to fibromyalgia which ultimately becomes most pronounced for pain.</p
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What is the link between mental imagery and sensory sensitivity? Insights from aphantasia
People with aphantasia have impoverished visual imagery so struggle to form mental pictures in the mind's eye. By testing people with and without aphantasia, we investigate the relationship between sensory imagery and sensory sensitivity (i.e., hyper- or hypo-reactivity to incoming signals through the sense organs). In Experiment 1 we first show that people with aphantasia report impaired imagery across multiple domains (e.g., olfactory, gustatory etc.) rather than simply vision. Importantly, we also show that imagery is related to sensory sensitivity: aphantasics reported not only lower imagery, but also lower sensory sensitivity. In Experiment 2, we showed a similar relationship between imagery and sensitivity in the general population. Finally, in Experiment 3 we found behavioural corroboration in a Pattern Glare Task, in which aphantasics experienced less visual discomfort and fewer visual distortions typically associated with sensory sensitivity. Our results suggest for the very first time that sensory imagery and sensory sensitivity are related, and that aphantasics are characterised by both lower imagery, and lower sensitivity. Our results also suggest that aphantasia (absence of visual imagery) may be more accurately defined as a subtype of a broader imagery deficit we name dysikonesia, in which weak or absent imagery occurs across multiple senses
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Reduced visual and frontal cortex activation during visual working memory in grapheme-colour synaesthetes relative to young and older adults
The sensory recruitment model envisages visual working memory (VWM) as an emergent property that is encoded and maintained in sensory (visual) regions. The model implies that enhanced sensory-perceptual functions, as in synaesthesia, entail a dedicated VWM-system, showing reduced visual cortex activity as a result of neural specificity. By contrast, sensory-perceptual decline, as in old age, is expected to show enhanced visual cortex activity as a result of neural broadening. To test this model, young grapheme-colour synaesthetes, older adults and young controls engaged in a delayed pair-associative retrieval and a delayed matching-to-sample task, consisting of achromatic fractal stimuli that do not induce synaesthesia. While a previous analysis of this dataset (Pfeifer et al., 2016) has focused on cued retrieval and recognition of pair-associates (i.e. long-term memory), the current study focuses on visual working memory and considers, for the first time, the crucial delay period in which no visual stimuli are present, but working memory processes are engaged. Participants were trained to criterion and demonstrated comparable behavioural performance on VWM tasks. Whole-brain and region-of-interest-analyses revealed significantly lower activity in synaesthetes’ middle frontal gyrus and visual regions (cuneus, inferior temporal cortex) respectively, suggesting greater neural efficiency relative to young and older adults in both tasks. The results support the sensory recruitment model and can explain age and individual WM-differences based on neural specificity in visual cortex.</p
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A symptom network model of misophonia: From heightened sensory sensitivity to clinical comorbidity
Objectives: Misophonia—an unusually strong intolerance of certain sounds—can cause significant distress and disruption to those who have it but is an enigma in terms of our scientific understanding. A key challenge for explaining misophonia is that, as with other disorders, it is likely to emerge from an interaction of traits that also occur in the general population (e.g., sensory sensitivity and anxiety) and that are transdiagnostic in nature (i.e., shared with other disorders). Methods: In this preregistered study with a large sample of participants (N = 1430), we performed a cluster analysis (based on responses to questions relating to misophonia) and identified two misophonia subgroups differing in severity, as well as a third group without misophonia. A subset of this sample (N = 419) then completed a battery of measures designed to assess sensory sensitivity and clinical comorbidities. Results: Clinical symptoms were limited to the most severe group of misophonics (including autistic traits, migraine with visual aura, anxiety sensitivity, obsessive-compulsive traits). Both the moderate and severe groups showed elevated attention-to-detail and hypersensitivity (across multiple senses). A novel symptom network model of the data shows the presence of a central hub linking misophonia to sensory sensitivity which, in turn, connects to other symptoms in the network (relating to autism, anxiety, etc.). Conclusion: The core features of misophonia are sensory-attentional in nature with severity linked strongly to comorbidities
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Synaesthesia is linked to differences in music preference and musical sophistication and a distinctive pattern of sound-colour associations
Synaesthesia has often been linked to an artistic or creative temperament, but the nature of this link (and, hence, the candidate underpinning mechanisms) are poorly understood. This study focusses primarily on people with synaesthesia who have visual experiences, including colour, that are induced by music. We determine how this impacts their musical preferences and musical sophistication using previously validated self-report measures and contrast them against non-synaesthetes and synaesthetes with non-musical types. Our data show that people with music-colour synaesthesia gravitate towards certain genres (e.g., Reflective and Complex) and show more active engagement with music relative to controls and other synaesthetes. However, synaesthesia as a whole is also linked to greater musical sophistication (e.g., perceptual abilities). A second study examines in detail the nature of associations from musical notes to colours in synaesthetes relative to non-synaesthetes. Synaesthetes have a distinctive way of associating colours with notes: they are more consistent over time, show a more sensitive pitch-luminance correspondence, and have a distinctive colour palette (e.g., more browns, fewer greens). These indicative features can be used to determine the presence of this form of synaesthesia.</p
Neural basis of contagious itch and why some people are more prone to it
Watching someone scratch himself can induce feelings of itchiness in the perceiver. This provides a unique opportunity to characterize the neural basis of subjective experiences of itch, independent of changes in peripheral inputs. In this study, we first established that the social contagion of itch is essentially a normative response (experienced by most people), and that the degree of contagion is related to trait differences in neuroticism (i.e., the tendency to experience negative emotions), but not to empathy. Watching video clips of someone scratching (relative to control videos of tapping) activated, as indicated by functional neuroimaging, many of the neural regions linked to the physical perception of itch, including anterior insular, primary somatosensory, and prefrontal (BA44) and premotor cortices. Moreover, activity in the left BA44, BA6, and primary somatosensory cortex was correlated with subjective ratings of itchiness, and the responsivity of the left BA44 reflected individual differences in neuroticism. Our findings highlight the central neural generation of the subjective experience of somatosensory perception in the absence of somatosensory stimulation. We speculate that the habitual activation of this central “itch matrix” may give rise to psychogenic itch disorders
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Perceptual confirmation bias and decision bias underlie adaptation to sequential regularities
Our perception does not depend exclusively on the immediate sensory input. It is also influenced by our internal predictions derived from prior observations and the temporal regularities of the environment, which can result in choice history biases. However, it is unclear how this flexible use of prior information to predict the future influences perceptual decisions. Prior information may bias decisions independently of the current sensory input, or it may modulate the weight of current sensory input based on its consistency with the expectation. To address this question, we used a visual decision-making task and manipulated the transitional probabilities between successive noisy grating stimuli. Using a reverse correlation analysis, we evaluated the contribution of stimulus-independent decision bias and stimulus-dependent sensitivity modulations to choice history biases. We found that both effects coexist, whereby there was increased bias to respond in line with the predicted orientation alongside modulations in perceptual sensitivity to favour perceptual information consistent with the prediction, akin to selective attention. Furthermore, at the individual differences level, we investigated the relationship between autistic-like traits and the adaptation of choice history biases to the sequential statistics of the environment. Over two studies, we found no convincing evidence of reduced adaptation to sequential regularities in individuals with high autistic-like traits. In sum, we present robust evidence for both perceptual confirmation bias and decision bias supporting adaptation to sequential regularities in the environment.</p