Plaster Hypothesis (McCrae & Costa)
personality fully biologically determined, completely developed by 30yo (changes after this trivial/non-existent)
Cross-sectional Data
different ppl of various age surveyed at the same time
Pros & Cons: Cross-sectional Data
pro: cheap & fast (entire lifespan covered in data collection)
con: potentially bias by cohort effects (ie. covid, war)
Longitudinal Data
same ppl surveyed at diff times over the years
pros & cons: longitudinal data
pros: tracks within-person change, unaffected by cohort effects
cons: expensive & slow, can take decades
What are the 2 indicators of personality stability?
Absolute Stability / Mean-level Stability
consistency in the level/amount of personality attribute over time
(is person at 20yo more/less/equally extroverted at age 40)
Differential Stability / Rank-order Stability
consistency in the rank-ordering of personality across 2+ measurements
(is most/least extroverted person in friend group at 20yo the still same at 40yo)
Homotypic Stability
trait manifests in same way across lifespan
Heretotypic Stability
trait same but manifests differently across diff life stages
Rank-order stability
correlation b/w 2 assessments over time
What we do know: Differential Stability (rank-order stability)
Mean-level Change
standardized mean-level difference across time/age groups
reflects degree which trait level dec/inc among ALL ppl in population (avg)
What we do know: Absolute Stability (mean-level change)
The Disruption Hypothesis
pattern in adolescence
- dip in socially relevant traits (agreeableness, conscientiousness, extraversion)
- temporary inc in more resistant/neurotic/impulsive traits
The Maturity Principle
emerging/early adulthood
- inc traits w/ greater psychological maturity (emotional stability, conscientiousness, agreeableness)
- peak & consolidate in middle adulthood
SOCIAL INVESTMENT THEORY
Social Investment Theory (Robert et al, 2008)
personality maturation = response to requirements of age-graded social roles
excelling at uni, entering workforce, stable romantic relationships
Why LEAST data in old age?
What do we know about ppl w old age?
Motivational Framework of Personality Development in Late Adulthood (Bleidorn & Hopwood)
normative dec in OCEA = diminished ability to control environment -reduced primary control capacity (can’t just go run a marathon
continuous inc in emotional stability = help cope/compensate w age-graded loss - enhanced secondary control capacity (adjust goals/pov)
Paradox of Aging
ability to be okay w life & not be upset easily
older ppl more loss but more well-being B/C wiser goal pursuit & better emotional stability
Mechanisms of Stability
Mechanisms of Change
Impact of Life Events (meta-analysis, Buhler & colleagues)
robust & specific, relatively small effects
- ie. new relationship = more conscientiousness, more life satisfaction
- ie. marriage = lower openness
- ie. childbirth = lower extraversion
- ie, first job = more conscientiousness, self-esteem, life satisfaction
- ie. unemployment = less neuroticism, less conscientiousness