How does memory loss affect our sense of being the same person?

What is diachronic unity in the context of the self?

It is the deep conviction that, despite personal change over time, an individual continues to be the same person now as they were in the past and will remain so in the future.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

How does diachronic unity differ from synchronic unity?

Diachronic unity involves the experience of continuity of the self across time, whereas synchronic unity is the unification of the self in the present moment.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What are the two parallel mechanisms proposed by Prebble et al. through which autobiographical memory supports diachronic unity?

The two proposed parallel mechanisms are phenomenological continuity, which is experiential, and semantic continuity, which is knowledge-based.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What is phenomenological continuity and which memory system is it associated with?

Phenomenological continuity is the experiential sense of continuity afforded by episodic memory, which involves mentally projecting oneself into the past to consciously re-experience discrete moments.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

How is semantic continuity defined in relation to autobiographical memory?

Semantic continuity is a knowledge-based, abstract, and conceptual form of continuity mediated by semantic memory, which allows an individual to construct life stories and a temporally-extended self-concept.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What are self-event connections in autobiographical reasoning?

They are statement links created between an individual's conceptual self-concept and specific life events that they narrate.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What is the difference between stability connections and change connections in self-event connections?

Stability connections emphasize how an event illustrates a stable personal quality, whereas change connections explain how an individual changed because of a life event.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

In the global coherence of a life story, what does causal coherence measure?

It measures how well a narrative explains how events led to other events, how aspects of the self were affected by life events, and how personality contributed to those events.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What is thematic coherence in the global coherence framework of a life story?

It is the degree to which a life narrative identifies higher-level similarities, recurring motifs, or metaphors that provide thematic meaning and cohesion to the story.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What does temporal coherence assess in a life narrative?

It assesses the ability to locate, order, and sequence life events chronologically in relation to each other and the wider context of one's life.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What is the 'cultural concept of biography' as a feature of global coherence?

It is the degree to which an individual's life story incorporates culturally-accepted rules and expectations about which significant life milestones should be included.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What hypothesis did the study make regarding diachronic unity if episodic memory and autonoetic consciousness are disrupted?

The study hypothesized that disruption in phenomenological continuity (due to episodic memory deficits) would not impair subjective diachronic unity, provided that semantic continuity remained intact.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What were the three participant groups included in this study, and what were their sample sizes?

The study included 15 individuals with probable Alzheimer's disease (AD), 15 with amnestic mild cognitive impairment (aMCI), and 25 healthy older control adults (HC).

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI

What cognitive severity threshold on the MMSE was required for the Alzheimer's disease group in this study?

Participants in the AD group were required to have a mild-to-moderate dementia severity with an MMSE score of 10 or above (out of 30).

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

Did the AD or aMCI groups differ significantly from healthy controls in their subjective belief about being the same person as in their 20s (perceived persistence)?

No, there was no significant group difference, indicating that subjective beliefs about core self-persistence are relatively preserved in both memory-impaired groups.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

How did the study distinguish between the I-self and the Me-self in coding participants' responses?

The I-self represents the core, underlying essence of who you are (phenomenological continuity), whereas the Me-self represents self-concept attributes (traits, behaviors, and values associated with semantic continuity).

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

Which group expressed significantly greater me-self persistence over time compared to healthy controls?

The AD group's responses tended to express significantly greater me-self (trait/attribute) persistence than the healthy control group.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

How did the AD group compare to other groups regarding the sophistication of their explanations for self-persistence?

The AD group provided significantly less sophisticated explanations, with half of them offering simple, surface-level justifications that ignored personal change.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What counterintuitive correlation was found in the AD group between explanation sophistication and perceived self-persistence?

AD participants who provided more sophisticated explanations actually expressed less certainty over whether they remained the same person over time.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

How was the Life Story Interview structured to assist older adults and AD patients with task demands?

The narrative was divided into four chronological life chapters (childhood, teenage/early adulthood, middle adulthood, late adulthood), giving 10 minutes to narrate each.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

How did self-event connection usage in life narratives differ for the AD group compared to healthy controls?

The AD group used a significantly lower percentage of self-event connections in their life stories compared to the healthy control group.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

Across all participant groups, which type of self-event connection (change or stability) was used more frequently?

Across all groups, participants used a significantly larger percentage of change connections compared to stability connections.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What were the overall findings regarding the global coherence of the AD group's life stories?

The life stories of the AD group were rated as significantly less coherent overall (across temporal, causal, and thematic dimensions) than both the HC and aMCI groups.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What specific global coherence deficit was discovered in the aMCI group?

The aMCI group showed a selective deficit in causal coherence, while their temporal and thematic coherence remained relatively preserved.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

Did the memory-impaired groups differ from healthy controls in their inclusion of cultural life script events in their life narratives?

No, there were no significant differences, suggesting that cultural life scripts remain highly resilient even in individuals with AD or aMCI.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What significant negative correlation was found between narrative quality and subjective persistence within the AD group?

In the AD group, higher causal coherence and greater use of self-event stability connections were significantly correlated with lower subjective certainty about remaining the same person.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

How did the sophistication of persistence explanations relate to overall narrative identity in the AD group?

More sophisticated persistence explanations in the AD group were positively correlated with higher temporal and causal coherence, as well as greater use of self-event stability connections.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

How were participants primed in the Self-Persistence Interview to reflect on change and stability?

They were primed by completing two versions of the Twenty Statements Test (TST), describing who they are in the present and who they were in their early 20s.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

Why might simplistic 'change-ignoring' persistence explanations benefit AD patients?

Focusing on simple, superficial consistency allows them to maintain a strong belief in their diachronic unity without facing the stress or cognitive demands of personal change.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI

Did the study find a correlation between a lack of awareness of memory deficits and simplistic persistence explanations in AD?

No, there was no significant correlation between memory deficit awareness and the use of simplistic, change-ignoring persistence explanations.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

Which classic clinical case study is referenced in the introduction to illustrate severe disruption of phenomenological continuity?

Patient C.W., who lacked all episodic memories and constantly reported that he was conscious for the very first time.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What defines level 4 and 5 (the highest levels) of sophistication in self-persistence explanations?

They identify a core, unchanged element of the self despite surface changes, or demonstrate a meta-awareness of the paradox of self-persistence.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

According to Habermas and de Silveira, how does causal coherence compare developmentally to temporal coherence?

Causal coherence is developmentally more complex than temporal coherence, showing steep development during adolescence and being nearly absent in younger children.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What two cognitive tests were used to assess general cognitive performance and verbal fluency in this study?

The Mini-Mental State Examination (MMSE) was used for general cognitive performance, and the Controlled Oral Word Association (COWA) was used for verbal fluency.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified

What is the main theoretical conclusion drawn from the preserved sense of diachronic unity in AD and aMCI?

Autonoetic recollection of episodic memories is not the sole mechanism supporting diachronic unity, suggesting that semantic continuity plays a powerful compensatory role.

Source: The Persistence of the Self over Time in Mild Cognitive Impairment and Alzheimer's Disease · DOI · quote verified