Neural, Endocrine and Genetic Processes
Explain nervous-system communication, hormone action and genetic influence as interacting mechanisms in psychological functioning.
How to study A-level Psychology
For every claim, identify the mechanism, supporting evidence, method, alternative explanation, practical implication and justified conclusion.
Core concepts
Concept 1
Neurons communicate electrically within cells and chemically across synapses, with excitation, inhibition and summation affecting transmission.
Exam cue: Trace the signal or feedback sequence from input to response.
Concept 2
The central, peripheral and autonomic nervous systems coordinate with endocrine feedback to regulate arousal, stress and behaviour.
Exam cue: Explain what the comparison groups in a genetic design can and cannot isolate.
Concept 3
Twin, adoption, family, molecular and gene–environment evidence estimate genetic contribution but depend on assumptions about shared environments and measurement.
Exam cue: Use interaction and plasticity when moving from biological predisposition to outcome.
Targeted study blocks
Multi-board knowledge
Secure the shared psychological core
Learn the shared neural, hormonal and genetic mechanisms and the evidence designs used to investigate them.
Scientific reasoning
Use evidence before reaching a judgement
Link mechanism to behaviour, examine the design's assumptions and avoid turning probabilistic biological influence into individual destiny.
Risk pitfalls and guardrails
Calling neurotransmitters hormones.
Guardrail: Do not memorise a study as an isolated story or assume that one board's named research and option choices apply nationally.
Treating a higher concordance as proof of one causal gene.
Guardrail: Do not memorise a study as an isolated story or assume that one board's named research and option choices apply nationally.
Ignoring environmental effects on gene expression and neural development.
Guardrail: Do not memorise a study as an isolated story or assume that one board's named research and option choices apply nationally.
Memory anchors
Neuron
A neuron is a specialised cell that transmits electrical and chemical signals.
Synapse
A synapse is the junction where one cell influences another through chemical or electrical signalling.
Endocrine system
The endocrine system releases hormones into the bloodstream to regulate target tissues.
Concordance rate
A concordance rate is the proportion of paired individuals sharing a measured characteristic.
Gene–environment interaction
Gene–environment interaction occurs when genetic effects vary by environment or environmental effects vary by genotype.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
What is a neuron?
What is the function of dendrites?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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