What happens to personal identity when semantic knowledge degrades? A study of the self and autobiographical memory in semantic dementia

2012 ◽  
Vol 50 (2) ◽  
pp. 254-265 ◽  
Author(s):  
Céline Duval ◽  
Béatrice Desgranges ◽  
Vincent de La Sayette ◽  
Serge Belliard ◽  
Francis Eustache ◽  
...  
Author(s):  
Jakub Čapek ◽  
Sophie Loidolt

AbstractThis special issue addresses the debate on personal identity from a phenomenological viewpoint, especially contemporary phenomenological research on selfhood. In the introduction, we first offer a brief survey of the various classic questions related to personal identity according to Locke’s initial proposal and sketch out key concepts and distinctions of the debate that came after Locke. We then characterize the types of approach represented by post-Hegelian, German and French philosophies of the nineteenth and twentieth centuries. We argue that whereas the Anglophone debates on personal identity were initially formed by the persistence question and the characterization question, the “Continental” tradition included remarkably intense debates on the individual or the self as being unique or “concrete,” deeply temporal and—as claimed by some philosophers, like Sartre and Foucault—unable to have any identity, if not one externally imposed. We describe the Continental line of thinking about the “self” as a reply and an adjustment to the post-Lockean “personal identity” question (as suggested by thinkers such as MacIntyre, Ricœur and Taylor). These observations constitute the backdrop for our presentation of phenomenological approaches to personal identity. These approaches run along three lines: (a) debates on the layers of the self, starting from embodiment and the minimal self and running all the way to the full-fledged concept of person; (b) questions of temporal becoming, change and stability, as illustrated, for instance, by aging or transformative life-experiences; and (c) the constitution of identity in the social, institutional, and normative space. The introduction thus establishes a structure for locating and connecting the different contributions in our special issue, which, as an ensemble, represent a strong and differentiated contribution to the debate on personal identity from a phenomenological perspective.


2021 ◽  
Vol 11 (8) ◽  
pp. 998
Author(s):  
Siobhán R. Shaw ◽  
Hashim El-Omar ◽  
Siddharth Ramanan ◽  
Olivier Piguet ◽  
Rebekah M. Ahmed ◽  
...  

Semantic dementia (SD) is a younger-onset neurodegenerative disease characterised by progressive deterioration of the semantic knowledge base in the context of predominantly left-lateralised anterior temporal lobe (ATL) atrophy. Mounting evidence indicates the emergence of florid socioemotional changes in SD as atrophy encroaches into right temporal regions. How lateralisation of temporal lobe pathology impacts the hedonic experience in SD remains largely unknown yet has important implications for understanding socioemotional and functional impairments in this syndrome. Here, we explored how lateralisation of temporal lobe atrophy impacts anhedonia severity on the Snaith–Hamilton Pleasure Scale in 28 SD patients presenting with variable right- (SD-R) and left-predominant (SD-L) profiles of temporal lobe atrophy compared to that of 30 participants with Alzheimer’s disease and 30 healthy older Control participants. Relative to Controls, SD-R but not SD-L or Alzheimer’s patients showed clinically significant anhedonia, representing a clear departure from premorbid levels. Overall, anhedonia was more strongly associated with functional impairment on the Frontotemporal Dementia Functional Rating Scale and motivational changes on the Cambridge Behavioural Inventory in SD than in Alzheimer’s disease patients. Voxel-based morphometry analyses revealed that anhedonia severity correlated with reduced grey matter intensity in a restricted set of regions centred on right orbitofrontal and temporopolar cortices, bilateral posterior temporal cortices, as well as the anterior cingulate gyrus and parahippocampal gyrus, bilaterally. Finally, regression and mediation analysis indicated a unique role for right temporal lobe structures in modulating anhedonia in SD. Our findings suggest that degeneration of predominantly right-hemisphere structures deleteriously impacts the capacity to experience pleasure in SD. These findings offer important insights into hemispheric lateralisation of motivational disturbances in dementia and suggest that anhedonia may emerge at different timescales in the SD disease trajectory depending on the integrity of the right hemisphere.


Neurocase ◽  
2009 ◽  
Vol 15 (5) ◽  
pp. 405-418 ◽  
Author(s):  
Clare J. Rathbone ◽  
Chris J. A. Moulin ◽  
Martin A. Conway

This section tells the story of my mother's stroke and what I have learnt from it about mind, body, consciousness, and the self, arguably the most cross-disciplinary topic of all. What gives us our sense of personal identity – our body? Our mind? Their union? And what if one of them is diminished – say, as a result of an accident; what then, do we stop being ourselves? This opening chapter sets the scene for the debate that follows, on this most fascinating mystery of all – our own self and consciousness. We question the still dominant dualist approach of the mind, seeking a more holistic view of the self; to this end, we believe that adding relevant experiential aspects will help complement the theory. Thus, an interdisciplinary, trans-theoretical account is needed in this endeavour. In this chapter, we introduce the dilemma and draw the main lines of argumentation related to it. In Chapter 2, we discuss the first experiential (in other words, the clinical) aspects of the mind, and neuroscientists' view of it, followed – in Chapter 3, by social aspects and psychologists' contributions to the subject. Chapter 4 will add more idiosyncratic aspects to the debate, such as the spiritual profile of a person, more often discussed in philosophy, religion, and art.


Author(s):  
Matthew D. Grilli ◽  
Lee Ryan

Autobiographical memory plays a central role in one’s conceptualization of the self. It does so not only by storing the content of one’s life history, but also by providing the memories that are used to construct who we are and what we hope to become. Based on theories and evidence from cognitive neuroscience, the authors of this chapter discuss the contents and organization of autobiographical memory and the neural mechanisms that support the retrieval of autobiographical memories. They also cover core self-related functions served by this type of memory. The chapter closes by considering how the cognitive neuroscience of autobiographical memory and its self-related functions can provide insight into mechanisms of enduring change.


2020 ◽  
pp. 52-72
Author(s):  
Sarah Molouki ◽  
Stephanie Y. Chen ◽  
Oleg Urminsky ◽  
Daniel M. Bartels

This chapter summarizes experimental work exploring how individual beliefs about the personally disruptive character of transformative experiences are influenced by intuitive theories of what a self fundamentally is, at the current moment and over time. Judgments of disrupted personal identity are influenced by views of the causal centrality of a transformed trait to a person’s self-concept, with changes in more central features perceived as more disruptive to self-continuity. Furthermore, the type of change matters: unexpected or undesirable changes to personal features are viewed as more disruptive to self-continuity than changes that are consistent with a person’s expected developmental trajectory. The degree to which an individual considers a particular personal change to be disruptive will affect how he or she makes decisions about, reacts to, and copes with this experience.


2020 ◽  
Vol 73 (11) ◽  
pp. 1969-1976 ◽  
Author(s):  
Catherine Loveday ◽  
Amy Woy ◽  
Martin A Conway

This study is the first to demonstrate that a self-defining period (SP) for personally relevant music emerges spontaneously in a public naturalistic setting. While previous research has demonstrated that people tend to have better memory and preference for songs from their teenage years, the theoretical relevance of these studies has been limited by their reliance on forced-choice methodology and a confinement to contemporary popular Western music. Here, we examine the record choices of famous guests ( n = 80; mean age = 61.6 years) interviewed for Desert Island Discs, a long-running popular radio programme on BBC Radio 4. Half of all choices were shown to have been most important between the ages of 10 and 30 years, and the most popular reason for their relevance was the song’s link to memories of a person, period, or place. We suggest that music is a defining feature of the SP, intrinsically connected to the developing self.


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