What is the difference between the sympathetic and parasympathetic nervous systems?

The sympathetic nervous system prepares the body for 'fight or flight' by increasing heart rate, dilating pupils, and inhibiting digestion. The parasympathetic nervous system returns the body to a 'rest and digest' state, slowing heart rate, constricting pupils, and stimulating digestion. They work antagonistically to maintain homeostasis.

How do neurons communicate with each other?

Neurons communicate via synaptic transmission. An action potential travels down the axon to the presynaptic terminal, triggering the release of neurotransmitters from vesicles into the synaptic cleft. These chemicals bind to receptors on the postsynaptic membrane, causing either excitation (depolarisation) or inhibition (hyperpolarisation). The signal is then terminated by reuptake or enzymatic breakdown.

What is brain plasticity and why is it important?

Brain plasticity refers to the brain's ability to change and adapt throughout life, forming new neural connections. It is crucial for learning, memory, and recovery after injury. For example, after a stroke, other brain areas can take over lost functions. Plasticity is most pronounced in childhood but continues into adulthood, though to a lesser extent.

How do fMRI and EEG differ in studying the brain?

fMRI measures changes in blood flow (hemodynamic response) to detect active brain areas, providing high spatial resolution (mm) but low temporal resolution (seconds). EEG records electrical activity via electrodes on the scalp, offering high temporal resolution (ms) but poor spatial resolution. fMRI is better for localising function, while EEG is ideal for tracking rapid changes like brain waves.

What is the role of the endocrine system in behaviour?

The endocrine system releases hormones (e.g., adrenaline, cortisol) into the bloodstream to regulate long-term processes like stress, growth, and metabolism. For example, during stress, the hypothalamus triggers the pituitary gland to release ACTH, which stimulates the adrenal glands to produce cortisol, affecting mood and energy. Hormones can influence behaviour, such as aggression linked to testosterone.

Can the brain repair itself after damage?

To some extent, yes. The brain can undergo functional recovery through plasticity, where undamaged neurons form new connections and take over lost functions. This is aided by rehabilitation. However, severe damage may lead to permanent deficits, and neurogenesis (birth of new neurons) is limited in adults. Recovery varies by age, location of damage, and individual factors.

Biopsychology

AQA

A-Level

The Biopsychology topic explores the biological foundations of human behaviour, covering the structure and function of the nervous and endocrine systems, the mechanisms of synaptic transmission, the fight or flight response, brain localisation and lateralisation, plasticity, methods of studying the brain, and biological rhythms.

Objectives

Exam Tips

Pitfalls

Key Terms

Mark Points

Topic Overview

Biopsychology explores the biological foundations of behaviour, focusing on how the brain, nervous system, and endocrine system influence thoughts, emotions, and actions. In AQA A-Level Psychology, this topic covers key areas such as the structure and function of neurons, synaptic transmission, the divisions of the nervous system (central and peripheral), and the role of hormones and the endocrine system. Understanding biopsychology is essential because it provides a scientific lens through which to view psychological phenomena, linking mental processes to measurable biological activity.

This topic also introduces students to research methods unique to biopsychology, including brain scanning techniques (e.g., fMRI, EEG, ERP) and ways of studying the brain post-mortem. Biopsychology is foundational for other topics like stress, addiction, and schizophrenia, as it explains the biological mechanisms underlying these conditions. Mastering biopsychology helps students appreciate the interplay between nature and nurture, as biological systems are constantly shaped by environmental factors.

In the AQA A-Level exam, biopsychology appears in Paper 2 (Psychology in Context) and is often tested through short-answer questions, extended writing, and application scenarios. Students must be able to describe and evaluate key concepts, such as localisation of function, hemispheric lateralisation, and plasticity, while also critiquing research methods and ethical considerations. A strong grasp of biopsychology not only boosts exam performance but also deepens understanding of how biology underpins everyday behaviour.

Key Concepts

Core ideas you must understand for this topic

→The divisions of the nervous system: central (brain and spinal cord) and peripheral (somatic and autonomic, which includes sympathetic and parasympathetic branches).
→Neurons and synaptic transmission: structure of sensory, relay, and motor neurons; the process of action potentials; release of neurotransmitters; and excitation/inhibition (e.g., GABA vs. glutamate).
→Localisation of function in the brain: specific areas like the motor cortex, somatosensory cortex, visual cortex, Broca's area, and Wernicke's area, along with evidence from case studies (e.g., Phineas Gage) and brain scans.
→Plasticity and functional recovery: the brain's ability to reorganise after trauma or learning, including synaptic pruning and neurogenesis (limited in adults).
→Ways of studying the brain: fMRI (measures blood flow), EEG (records electrical activity), ERP (averaged EEG responses), and post-mortem examinations.

What You Need to Demonstrate

Key skills and knowledge for this topic

Divisions of the nervous system (central and peripheral, somatic and autonomic)
Structure and function of sensory, relay and motor neurons
Process of synaptic transmission (neurotransmitters, excitation and inhibition)
Function of the endocrine system (glands and hormones)
The fight or flight response (role of adrenaline)
Localisation of function in the brain (motor, somatosensory, visual, auditory, language centres)
Broca’s and Wernicke’s areas
Split brain research and hemispheric lateralisation

Marking Points

Key points examiners look for in your answers

Divisions of the nervous system (central and peripheral, somatic and autonomic)
Structure and function of sensory, relay and motor neurons
Process of synaptic transmission (neurotransmitters, excitation and inhibition)
Function of the endocrine system (glands and hormones)
The fight or flight response (role of adrenaline)
Localisation of function in the brain (motor, somatosensory, visual, auditory, language centres)
Broca’s and Wernicke’s areas
Split brain research and hemispheric lateralisation
Brain plasticity and functional recovery after trauma
Ways of studying the brain (fMRI, EEG, ERP, post-mortem examinations)
Biological rhythms (circadian, infradian, ultradian)
Effect of endogenous pacemakers and exogenous zeitgebers on the sleep/wake cycle

Examiner Tips

Expert advice for maximising your marks

💡Use clear, labelled diagrams to explain synaptic transmission or the nervous system structure if appropriate
💡Ensure you can explicitly define and distinguish between circadian, infradian and ultradian rhythms
💡When discussing brain scanning techniques, focus on the strengths and limitations of each (e.g., temporal vs spatial resolution)
💡Be prepared to apply knowledge of plasticity and functional recovery to real-world scenarios of brain trauma
💡When evaluating localisation of function, always mention both supporting evidence (e.g., brain scans showing activation in specific areas) and counter-evidence (e.g., Lashley's equipotentiality theory, suggesting some functions are distributed). This shows critical thinking.
💡For synaptic transmission questions, use precise terminology: 'action potential', 'vesicles', 'reuptake', 'excitatory postsynaptic potential (EPSP)', and 'inhibitory postsynaptic potential (IPSP)'. Avoid vague terms like 'chemicals' or 'signals'.
💡When discussing plasticity, provide a specific example, such as taxi drivers' enlarged posterior hippocampi (Maguire et al., 2000) or recovery after stroke. This demonstrates application of knowledge to real-world contexts.

Common Mistakes

Pitfalls to avoid in your exam answers

Confusing the roles of different types of neurons
Inaccurate description of the synaptic transmission process (e.g., failing to mention neurotransmitters or the direction of flow)
Confusing localisation of function with hemispheric lateralisation
Failing to distinguish between the different types of biological rhythms
Misunderstanding the role of endogenous pacemakers versus exogenous zeitgebers
Misconception: The brain works as a single, unified whole with no specialised areas. Correction: While the brain is interconnected, specific functions are localised to particular regions (e.g., Broca's area for speech production). Damage to these areas causes specific deficits, supporting localisation.
Misconception: The autonomic nervous system is entirely involuntary and cannot be controlled. Correction: While largely automatic, techniques like biofeedback and meditation can influence autonomic functions such as heart rate and breathing, showing some voluntary control.
Misconception: Neurotransmitters are either always excitatory or always inhibitory. Correction: The effect depends on the receptor they bind to. For example, acetylcholine is excitatory at neuromuscular junctions but inhibitory in the heart.

Frequently Asked Questions

Common questions students ask about this topic

Before You Start

Prior knowledge that will help with this topic

•Basic understanding of the nervous system from GCSE Biology or Psychology, including the role of neurons and the brain.
•Familiarity with the concept of homeostasis and the fight-or-flight response, as these link to the autonomic nervous system and endocrine system.
•Knowledge of research methods (e.g., correlations, experiments) to evaluate studies like fMRI scans or case studies of brain-damaged patients.

Key Terminology

Essential terms to know

Likely Command Words

How questions on this topic are typically asked

Outline

Explain

Describe

Discuss

Evaluate

Compare

Ready to test yourself?

Practice questions tailored to this topic

Biopsychology

Topic Overview

Key Concepts

What You Need to Demonstrate

Marking Points

Examiner Tips

Common Mistakes

Frequently Asked Questions

Before You Start

Key Terminology

Likely Command Words

Ready to test yourself?

Related Topics in AQA A-Level Psychology

Addiction

Aggression

Approaches in Psychology

Attachment

Biopsychology — AQA A-Level Psychology Revision

Topic Synopsis

Key Concepts & Core Principles

Exam Tips & Revision Strategies

Common Misconceptions & Mistakes to Avoid

Examiner Marking Points

Biopsychology

Topic Overview

Key Concepts

What You Need to Demonstrate

Marking Points

Examiner Tips

Common Mistakes

Frequently Asked Questions

What is the difference between the sympathetic and parasympathetic nervous systems?

How do neurons communicate with each other?

What is brain plasticity and why is it important?

How do fMRI and EEG differ in studying the brain?

What is the role of the endocrine system in behaviour?

Can the brain repair itself after damage?

Before You Start

Key Terminology

Localization of Function

Neural Plasticity and Functional Recovery

Hemispheric Lateralization

Likely Command Words

Ready to test yourself?

Related Topics in AQA A-Level Psychology

Addiction

Aggression

Approaches in Psychology

Attachment