Abstract conceptual feature ratings: the role of emotion, magnitude, and other cognitive domains in the organization of abstract conceptual knowledge.

This study harnessed control ratings of the contribution of different types of information (sensation, action, emotion, thought, social interaction, morality, time, space, quantity, and polarity) to 400 individual abstract and concrete verbal concepts. These abstract conceptual feature (ACF) ratings were used to generate a high dimensional semantic space, from which Euclidean distance measurements between individual concepts were extracted as a metric of the semantic relatedness of those words. The validity of these distances as a marker of semantic relatedness was then tested by evaluating whether they could predict the comprehension performance of a patient with global aphasia on two verbal comprehension tasks. It was hypothesized that if the high-dimensional space generated from ACF control ratings approximates the organization of abstract conceptual space, then words separated by small distances should be more semantically related than words separated by greater distances, and should therefore be more difficult to distinguish for the comprehension-impaired patient, SKO. SKO was significantly worse at identifying targets presented within word pairs with low ACF distances. Response accuracy was not predicted by Latent Semantic Analysis (LSA) cosines, any of the individual feature ratings, or any of the background variables. It is argued that this novel rating procedure provides a window on the semantic attributes of individual abstract concepts, and that multiple cognitive systems may influence the acquisition and organization of abstract conceptual knowledge. More broadly, it is suggested that cognitive models of abstract conceptual knowledge must account for the representation not only of the relationships between abstract concepts but also of the attributes which constitute those individual concepts

Posterior cortical atrophy: an overview for optometrists

Posterior cortical atrophy (PCA) is a neurodegenerative syndrome that is characterised by a progressive decline in visuospatial and visuospatial skills1,2. Precise estimates of the prevalence and incidence of PCA are difficult to determine; this largely owes to an under-recognition of the PCA syndrome, misdiagnosis, and certain inconsistencies in the application of clinical and research criteria for PCA. Estimates to date have been based on specialist dementia and memory clinics, which include reports of between 8-13% of patients as having predominant visual disturbances in addition to nonvisual symptoms characteristically associated with PCA, such as difficulties with writing, calculation, spelling, handwriting and praxis skills3,4.  All of this leads easily to misinterpretation of routine ophthalmological investigations using automated static perimetry, crowded Snellen letter or Ishihara colour charts

Knowing what and where:TMS evidence for the dual neural basis of geographical knowledge

AbstractAll animals acquire knowledge about the topography of their immediate environment through direct exploration. Uniquely, humans also acquire geographical knowledge indirectly through exposure to maps and verbal information, resulting in a rich database of global geographical knowledge. We used transcranial magnetic stimulation to investigate the structure and neural basis of this critical but poorly understood component of semantic knowledge. Participants completed tests of geographical knowledge that probed either information about spatial locations (e.g., France borders Spain) or non-spatial taxonomic information (e.g., France is a country). TMS applied to the anterior temporal lobe, a region that codes conceptual knowledge for words and objects, had a general disruptive effect on the geographical tasks. In contrast, stimulation of the intraparietal sulcus (IPS), a region involved in the coding of spatial and numerical information, had a highly selective effect on spatial geographical decisions but no effect on taxonomic judgements. Our results establish that geographical concepts lie at the intersection of two distinct neural representation systems, and provide insights into how the interaction of these systems shape our understanding of the world

Thinking eyes: visual thinking strategies and the social brain

The foundation of art processes in the social brain can guide the scientific study of how human beings perceive and interact with their environment. Here, we applied the theoretical frameworks of the social and artistic brain connectomes to an eye-tracking paradigm with the aim to elucidate how different viewing conditions and social cues influence gaze patterns and personal resonance with artworks and complex imagery in healthy adults. We compared two viewing conditions that encourage personal or social perspective taking-modeled on the well-known Visual Thinking Strategies (VTS) method-to a viewing condition during which only contextual information about the image was provided. Our findings showed that the viewing conditions that used VTS techniques directed the gaze more toward highly salient social cues (Animate elements) in artworks and complex imagery, compared to when only contextual information was provided. We furthermore found that audio cues also directed visual attention, whereby listening to a personal reflection by another person (VTS) had a stronger effect than contextual information. However, we found no effect of viewing condition on the personal resonance with the artworks and complex images when taking the random effects of the image selection into account. Our study provides a neurobiological grounding of the VTS method in the social brain, revealing that this pedagogical method of engaging viewers with artworks measurably shapes people's visual exploration patterns. This is not only of relevance to (art) education but also has implications for art-based diagnostic and therapeutic applications

Where words meet numbers:Comprehension of measurement unit terms in posterior cortical atrophy

Units of measurement (e.g., metre, week, gram) are critically important concepts in everyday life. Little is known about how knowledge of units is represented in the brain or how this relates to other forms of semantic knowledge. As unit terms are intimately connected with numerical quantity, we might expect knowledge for these concepts to be supported by parietally-mediated representations of space, time and magnitude. We investigated knowledge for measurement units in patients with posterior cortical atrophy (PCA), who display profound impairments of spatial and numerical cognition associated with occipital and parietal lobe atrophy. Relative to healthy controls, PCA patients displayed impairments for a range of unit-based knowledge, including the ability to specify the dimension which a unit refers to (e.g., grams measure mass), to select the appropriate units to measure everyday quantities (grams for sugar) and to determine the relative magnitudes of different unit terms (gram is smaller than kilogram). In most cases, their performance was also significantly poorer than a patient control group diagnosed with typical Alzheimer's disease. Our results suggest that impairment to systems that code numerical and spatial magnitudes has an effect on non-numerical verbal knowledge for measurement units. Units of measurement appear to lie at the intersection of the brain's verbal and numerical semantic systems, making them a critical class of concepts in which to investigate how magnitude-based codes contribute to verbal semantic representation

Adaptation of an eHealth Intervention: iSupport for Carers of People with Rare Dementias

‘iSupport’ is an online psychoeducation and skills development intervention created by the World Health Organisation to support people with dementia. This project adapted iSupport for carers of people with rare dementias (iSupport RDC), creating a new resource to support the health and wellbeing of this underserved population. The adaptation involved three phases: (1) Codesign methods to generate preliminary adaptations; (2) Analysis of phase one findings informingadaptations to iSupport to develop; iSupport RDC; (3) Post-adaptation survey to ascertain participant agreement with the adaptations in iSupport RDC. Fourteen participants contributed, resulting in 212 suggested adaptations, of which 94 (92%) were considered practical, generalisable, and aligned with iSupport principles. These adaptations encompassed content and design changes, including addressing the challenges of rare dementias (PCA, PPA, LBD, and FTD). iSupport RDC represents a significant adaptation of the WHO iSupport intervention. Its tailored nature acknowledges the unique needs of people caring for someone with a rare dementia, improving their access to specialisedresources and support. By extending iSupport to this population, it contributes to advancing dementia care inclusivity and broadening the understanding of rare dementias. A feasibility study is underway to assess iSupport RDCs acceptability, with prospects for cultural adaptations to benefit carers globally

Injections of hope: supporting participants in clinical trials

Understanding hope and better appreciating the personal investments of trial participants could improve patient experience and trial design, argue Emma Harding, Catherine Mummery, and colleague

The arts and dementia: Emerging directions for theory, research and practice

This is a Special Issue of the Journal Dementia that I was responsible for co-editing. This special issue includes papers that are empirical, theoretical and review-based, exploring the visual arts, music, theatre and the spoken word. A variety of cultural contexts and settings are covered (including a UK hospital, a US long-term care facility, closed wards in a Dutch nursing home and a German Museum). A systematic review by Curtis et al. sets the tone for this collection by providing high-level evidence about the effectiveness of a range of arts for health activities on the health, well-being and quality of life for older people in care homes. Music in dementia care has predominantly been considered in community settings and amongst groups of people with mild to moderate dementia. A unique international overview of the most current research into the impacts of music in healthy ageing for people living with strokes and also with a dementia is given by Särkämö, and Daykin et al.’s original study contributes to understanding about how live, participatory music sessions can ameliorate hospital-based care for those with dementia. The importance of confronting the theoretical basis of visual art programmes is tackled by Windle et al., and the study by Schall et al. contributes to the growing evidence base concerning the value of museum-based projects for people with a dementia. There is also a more personal, reflective account by Harrison exploring the transformative effects on an artists’ practice of working with people with a dementia. In a similarly reflective vein, Basting outlines the development of ‘The Penelope Project’ and explores how a creative, community building approach can engage people living with dementias as equals in culture-making projects. Using one of Bastings’ innovations, Swinnen and de Medeiros, in their study, demonstrate the ways in which spoken word projects can support the linguistic agency of people with a dementia in long-term care settings