Genetic and Environmental Factors in ADHD Quiz for Psychology Students

📚 Quick Study Guide: ADHD Factors

• 🧬 Genetic Predisposition: ADHD is highly heritable, with genetic factors accounting for approximately 70-80% of its variance. It's polygenic, meaning multiple genes contribute.
• 🔬 Candidate Genes: Research often focuses on genes involved in dopamine regulation (e.g., DRD4, DRD5, DAT1), serotonin, and norepinephrine pathways, which are crucial for attention and impulse control.
• 🤰 Prenatal Environmental Factors: Exposure to certain substances during pregnancy, such as alcohol, nicotine, and illicit drugs, significantly increases the risk of ADHD.
• 👶 Perinatal & Early Childhood Factors: Premature birth, low birth weight, and early childhood exposure to lead or other toxins are linked to higher ADHD prevalence.
• 👨‍👩‍👧‍👦 Psychosocial Environment: While not direct causes, adverse psychosocial factors like family conflict, low socioeconomic status, and chaotic home environments can exacerbate ADHD symptoms or affect prognosis, especially when combined with genetic vulnerability.
• 🔄 Gene-Environment Interaction: The most current understanding emphasizes that genes and environment interact. Genetic predispositions can make individuals more susceptible to environmental risks, or protective environments can mitigate genetic risks.
• 🧠 Neurobiological Basis: ADHD is associated with differences in brain structure and function, particularly in areas related to executive functions like the prefrontal cortex, basal ganglia, and cerebellum.

💡 Practice Quiz

Test your understanding of the genetic and environmental factors influencing ADHD.

1. Heritability: Which of the following best describes the heritability of ADHD?

1. It is primarily caused by environmental factors, with minimal genetic influence.
2. Genetic factors account for approximately 10-20% of the variance.
3. It is highly heritable, with genetic factors accounting for 70-80% of the variance.
4. Heritability estimates are inconclusive and vary widely across studies.

2. Candidate Genes: Research on the genetic basis of ADHD most commonly focuses on genes related to which neurotransmitter system?

1. Acetylcholine
2. Serotonin
3. Dopamine
4. GABA

3. Prenatal Exposure: Which prenatal environmental factor is strongly associated with an increased risk of ADHD?

1. Maternal intake of folic acid supplements.
2. Exposure to high levels of caffeine.
3. Maternal alcohol consumption.
4. Regular exercise during pregnancy.

4. Gene-Environment Interaction: The concept of 'gene-environment interaction' in ADHD suggests that:

1. Genes alone determine the severity of ADHD symptoms, regardless of environment.
2. Environmental factors can completely override genetic predispositions.
3. Genetic predispositions can make individuals more or less sensitive to environmental influences.
4. Genes and environment act independently, with no interplay.

5. Early Childhood Risk: Which of these early childhood factors is considered a potential environmental risk for ADHD?

1. Exposure to second-hand smoke.
2. Participation in structured preschool programs.
3. Early introduction to diverse foods.
4. Living in a two-parent household.

6. Psychosocial Factors: While not direct causes, adverse psychosocial factors like chaotic home environments are thought to:

1. Directly cause ADHD in genetically predisposed individuals.
2. Have no impact on the manifestation or severity of ADHD.
3. Exacerbate ADHD symptoms or affect prognosis, especially when combined with genetic vulnerability.
4. Only affect individuals without any genetic predisposition to ADHD.

7. Neurobiological Basis: ADHD is often associated with differences in brain function, particularly in areas related to:

1. Sensory processing and motor reflexes.
2. Executive functions like planning and impulse control.
3. Visual perception and auditory processing.
4. Memory encoding and retrieval.