Comprehensive Study Notes on Developmental Psychology and Cognitive Psychology and Aging
Emotion Regulation and the Gross Model in Aging
The Gross model describes five distinct stages of emotion regulation, which are utilized differently across life stages. Older adults tend to favor earlier strategies (selection, modulation, redirection), while younger adults more frequently employ later-stage strategies.
Situationsval (Situation Selection): Choosing specific situations to optimize emotional outcomes. An individual avoids situations known to trigger negative emotions like anger, stress, or grief.
Situationsmodifiering (Situation Modification): Altering the situation if one is already in it to change its emotional impact. For example, moving away from an unpleasant situation that occurred unintentionally.
Uppmärksamhetsstyre (Attentional Deployment): Controlling what one focuses on within a situation. An example is looking away from a scary scene in a horror film to avoid fear.
Kognitiv omvärdering (Cognitive Reappraisal): Changing how one interprets or thinks about a situation to reduce the intensity of an emotion. Phrases like "I can handle this" or "it’s not as bad as I think" exemplify this strategy.
Responsmodulering (Response Modulation): Dealing with the emotion after it has already arisen. Examples include taking three deep breaths after feeling stressed or frightened.
Age and Strategy Preference: Older adults prioritize situation selection, modification, and attentional deployment because these strategies are often more automatic and require less cognitive load. They are linked to the Positivity Bias, where older individuals focus on positive stimuli and meaningful goals to maintain well-being despite losses.
Psychological Well-being and Distress over the Adult Lifespan
Empirical data challenges the historical assumption that well-being increases linearly throughout adulthood. Instead, research shows a U-shaped pattern.
The U-Shaped Pattern: Psychological well-being typically decreases from youth into midlife and then increases again in later adulthood.
Midlife Distress: Psychological distress (stress, depressive symptoms) peaks in midlife (roughly ages –). Data from British birth cohorts confirm this peak in distress during this decade.
Contributing Factors in Midlife: This period is characterized by simultaneous roles and demands, including career responsibilities, economic pressure, caring for children, caring for aging parents, and increasing health problems.
Impact on Later Cognition: Individual characteristics in midlife can predict cognitive health later in life. High education, cognitive demand at work, and good health in midlife are linked to better cognitive performance in old age via mechanisms such as Cognitive Reserve and Brain Maintenance.
Research Methodologies: Cross-sectional and Longitudinal Designs
Tvärsnittsstudier (Cross-sectional Studies): Individuals of different ages (and therefore different cohorts) are examined at a single point in time.
Strengths: Quick and cost-effective.
Limitations: Observed differences may be due to cohort effects (historical/social differences) rather than biological aging.
Longitudinella studier (Longitudinal Studies): The same individuals from the same cohort are followed and tested at multiple intervals over time.
Strengths: Allows for the study of individual change and developmental trajectories.
Limitations: Time-consuming, resource-intensive, and sensitive to selective attrition and practice effects.
Cognitive Performance Trajectories and Theories
Cognitive abilities do not decline uniformly. Some are preserved, while others show significant impairment.
Episodic Memory: Shows a steep decline with age. Recent research suggests the issue is often related to retrieval rather than the memory being gone. Older adults struggle with free recall and cued recall but may rely on familiarity (recognition) rather than "knowing."
Fluid vs. Crystallized Intelligence:
Fluid Intelligence: Capacity to solve new problems and process information quickly. This tends to decline earlier and more steeply.
Crystallized Intelligence: Accumulated knowledge, vocabulary, and facts. This is often preserved or even improves throughout life.
Recent findings: There is a high correlation between declines in both; fluid decline can accompany crystallized decline.
Processing Speed Hypothesis: Argues that mental processing speed decreases with age, and this primary deficit mediates the decline in other cognitive functions like working memory and problem-solving. This can manifest in practical ways, such as increased difficulty navigating traffic.
Inhibitory Deficit: Difficulty filtering out irrelevant information blocks working memory, making it "cluttered" and reducing performance in distracting environments.
Frontal Lobe Hypothesis: According to the first-in-last-out theory, the frontal lobe (responsible for executive functions, working memory, and processing speed) is among the first to undergo atrophy. This atrophy may be the cause behind global cognitive decline.
Neurobiological Changes in the Aging Brain
Structural Atrophy: Aging involves gray matter volume loss and white matter integrity reduction. Ventricles often enlarge, leading to increased cerebrospinal fluid (CSF) volume.
Selective Vulnerability: Association areas like the prefrontal cortex and hippocampus are more vulnerable than primary sensory or motor areas (e.g., visual or auditory cortex).
White Matter: Described as "less wiring, more firing." Poor connectivity (reduced integrity as measured by DTI) in white matter targets can lead to inefficient brain activation.
Dopamine: Significant reduction in striatal dopamine and postsynaptic dopamine receptors in the frontal cortex occurs with age.
High vs. Low Performers: Maintainers often show stable hippocampal activation and high initial frontal activity, while decliners show hypoactivation in the hippocampus.
Brain Activation Models: HERA, HAROLD, and PASA
Functional imaging (PET/fMRI) shows distinct patterns of brain activation in older versus younger adults.
HERA (Hemispheric Encoding/Retrieval Asymmetry): In younger adults, the left frontal lobe is active during encoding, and the right frontal lobe is active during retrieval.
HAROLD (Hemispheric Asymmetry Reduction in Older Adults): In older adults, this asymmetry disappears. Both frontal lobes are active during both encoding and retrieval (bilateral activation).
Interpretations: This could represent compensation (recruiting more resources to maintain performance) or dedifferentiation (loss of neural specialization/diffuse activation).
PASA (Posterior-Anterior Shift in Aging): Older adults show decreased activation in posterior areas (occipital cortex) and increased activation in anterior areas (frontal cortex). This is often seen as a redistribution of resources.
The Default Mode Network (DMN) and Deactivation
DMN Function: Includes the medial prefrontal cortex (mPFC), anterior cingulate cortex, and lateral parietal cortex. It is active during inward focus/rest and should deactivate during cognitive tasks to reallocate resources.
Age Effects: In healthy young brains, DMN deactivates more as task complexity increases. In older adults, deactivation is slower, weaker, and less responsive to task difficulty. This failure to deactivate consumes resources meant for the task at hand, impairing performance in complex scenarios.
Preclinical Markers and Subtypes of Dementia
Early detection of dementia is critical for intervention and future planning.
1. Biomarkers for Alzheimer's Disease (AD):
PET Imaging: Used to detect increases in Amyloid plaques (protein clusters between neurons) and Tau (intracellular changes damaging neuron communication).
Blodprov (Blood Tests): Look for increased Tau but decreased Amyloid (as Amyloid is sequestered in the brain).
Cerebrospinalvätska (CSF): Look for increased levels of both Tau and Amyloid.
2. Structural Imaging (MRI): Identifying atrophy (especially in the hippocampus) or strokes. MRI can detect small or large vessel blockages indicative of Vaskulär Demens (Vascular Dementia).
3. Cognitive/Psychological Markers:
AD: Early indicator is a significant decline in episodic memory performance.
Vascular Dementia: Early indicator is typically a decline in executive functions.
Lifestyle Factors: Overweight, hypertension, high cholesterol, smoking, and lack of exercise are major risk factors for vascular dementia. Kognitiv träning (keeping the brain active) is argued to play a major role in delaying symptoms of Alzheimer's.
Theoretical Frameworks in Lifespan Psychology
Adaptive vs. Mechanistic Theories:
Adaptive: Aging is a positive evolutionary process (e.g., the "grandmother hypothesis"—menopause allows women to help raise grandchildren and pass on genes).
Mechanistic: Aging is a negative process of physiological decline that should be prevented as much as possible.
Baltes' Lifespan Framework:
Lifelong Development: Development occurs from birth to death, involving both gains and losses.
Multidimensionality and Multidirectionality: Development happens across various domains (biological, cognitive, social) and can move in different directions (some skills improve while others decline).
Plasticity: The capacity for change remains throughout life but is constrained by biological limits and supported by cultural resources (e.g., technology, education).
Core Debates:
Arv vs. Miljö (Nature vs. Nurture): Are traits innate (genes) or learned (trauma/environment)?
Kontinuitet vs. Diskontinuitet: Is development a steady stream or does it happen in discrete stages?
Universalitet vs. Specificitet: Is development the same for everyone across cultures?
Clinical Perspectives: Depression in the Elderly
Depression can present differently in older adults compared to younger populations.
Cardinal Symptoms (DSM-5/ICD-11):
Depressed mood most of the day for at least weeks.
Loss of interest or pleasure in activities previously enjoyed.
Differential Manifestation: Older adults often present with more somatic symptoms (pain, fatigue, sleep/appetite changes) and apathy.
Pseudodementia: Cognitive symptoms of depression (memory and concentration issues) in the elderly are frequently mistaken for dementia.
Late-onset Depression: Often linked to vascular factors and somatic brain changes.
Intraindividual and Brain Variability
Cognitive Variability: Fluctuations in performance within the same person increase with age and correlate negatively with overall cognitive performance.
Neural (BOLD) Variability: Younger adults typically show higher BOLD variability, reflecting efficient and flexible processing. Older adults show reduced BOLD variability, which is associated with slower and poorer performance.
Maintenance Theory: Suggests that better performance in some older adults is due to brain structures (like the hippocampus) that have not shrunk, rather than just effective compensation. Examples include London taxi drivers and medical students whose hippocampus volume increased after intensive learning and spatial training.