Psychology
Individual thinking and the influence of others — full Paper 1 + Paper 2 practice External Assessments with model responses and marking guides.
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Organisation of the Human Nervous System
Overview: The Nervous System as an Information Network
The human nervous system is the body's primary communication and control network, responsible for receiving sensory information from the environment and internal body states, processing that information, and coordinating appropriate responses. For QCAA Psychology Unit 3, students must understand how this system is hierarchically organised and how each division contributes to behaviour, cognition, and physiological regulation.
The nervous system is divided into two major structural branches:
- Central Nervous System (CNS) — comprising the brain and spinal cord; acts as the primary processing and integration centre.
- Peripheral Nervous System (PNS) — all neural tissue outside the CNS; carries information to and from the CNS via sensory (afferent) and motor (efferent) pathways.
These two branches work in constant dialogue. Sensory receptors in the skin, muscles, and organs detect stimuli and send signals along afferent (sensory) neurons toward the CNS. The CNS interprets these signals and, where a response is needed, sends instructions back through efferent (motor) neurons in the PNS to muscles or glands (effectors).
Applied example: When a Queensland student touches a hot stovetop burner, thermoreceptors and nociceptors in the fingertip generate electrical signals. These travel via afferent neurons in the PNS to the spinal cord (CNS). A reflex arc in the spinal cord immediately activates efferent motor neurons to withdraw the hand — before the signal even reaches the brain for conscious perception. This illustrates the speed advantage of localised spinal processing.
Understanding this organisation is foundational because QCAA exam questions regularly require students to trace information flow through specific divisions and explain the role — not merely the location — of each structure.
The Central Nervous System: Brain and Spinal Cord
The Central Nervous System (CNS) consists of the brain and the spinal cord, both encased in protective bone (skull and vertebral column respectively) and surrounded by three meningeal membranes and cerebrospinal fluid (CSF). The CNS is the site of all higher-order processing, integration of sensory data, decision-making, and coordination of voluntary and involuntary responses.
The Brain
The brain is divided into three broad regions, each with distinct functional roles:
- Forebrain (prosencephalon) — includes the cerebral cortex, thalamus, hypothalamus, and limbic system. The cerebral cortex is the site of conscious thought, language, memory, and voluntary movement. The thalamus serves as the brain's sensory relay station, routing incoming sensory signals (except olfaction) to appropriate cortical areas. The hypothalamus regulates homeostasis and coordinates the autonomic nervous system.
- Midbrain (mesencephalon) — involved in visual and auditory reflexes and relaying motor and sensory information between the forebrain and hindbrain.
- Hindbrain (rhombencephalon) — includes the cerebellum, pons, and medulla oblongata. The cerebellum coordinates fine motor control and balance. The pons relays signals between the cerebellum and cerebral cortex. The medulla oblongata controls vital autonomic functions: heart rate, breathing rate, and blood pressure.
The Spinal Cord
The spinal cord extends from the base of the brain (medulla oblongata) to approximately the first or second lumbar vertebra. It serves two roles: (1) a conduit for information travelling between the brain and the body via ascending (sensory) and descending (motor) tracts, and (2) an integration centre for spinal reflexes that bypass the brain entirely.
The spinal cord's cross-section reveals a butterfly-shaped region of grey matter (neuronal cell bodies) surrounded by white matter (myelinated axon tracts). The dorsal (posterior) horn receives incoming sensory information; the ventral (anterior) horn contains motor neurons that send efferent signals to skeletal muscles.
Applied example: A Brisbane rugby player takes a heavy tackle and experiences a spinal cord injury at the T10 level. Because descending motor tracts and ascending sensory tracts are severed at that point, the player loses voluntary movement and sensation below the injury — demonstrating how the spinal cord functions as both a relay and an integration site, and why localisation within the CNS has direct clinical consequences.
In Asch's (1951) line conformity study, what term describes conformity that occurs when an individual changes their public behaviour to match the group but privately disagrees with the group's answer?
- Internalisation
- Compliance
- Identification
- Conversion
Show the worked answer
Answer: B
B — Compliance describes public conformity without private acceptance; the individual goes along with the group without changing their private belief.
All 20 practice exams
- Exam 1 — Asch conformity (1951) — group size, confederates, normative vs informational influence; Milgram obedience (1963) — agency theory, situational factors; Stanford Prison Experiment — Haney, Banks and Zimbardo (1973)
- Exam 2 — Unit 3 Topic 1: Localisation of brain function, nervous system anatomy, synaptic transmission, neurotransmitters, Parkinson's disease, Alzheimer's disease; Unit 3 Topic 2: Visual perception, retinal reception, psychological/social/cultural influences, named illusions, cross-cultural studies; Unit 3 Topic 3: Working memory model (Baddeley and Hitch 1974), levels of processing (Craik and Lockhart 1972)
- Exam 3 — Visual perception and cross-cultural influences on the Muller-Lyer illusion (Unit 3 Topic 2); Localisation of brain function and synaptic transmission (Unit 3 Topic 1); Working memory model and levels of processing (Unit 3 Topic 3)
- Exam 4 — Levels of processing (Craik and Lockhart, 1972) — shallow rhyming vs deep semantic encoding and recall accuracy; Working memory model (Baddeley and Hitch, 1974) — phonological loop, visuospatial sketchpad, central executive, episodic buffer; Brain localisation and neurotransmitter function — Parkinson's disease, Alzheimer's disease, synaptic transmission
- Exam 5 — Bystander effect (Latane and Darley, 1968/1970) — diffusion of responsibility, audience inhibition, social influence; Prosocial and antisocial behaviour — media influences on aggression; Social influence — conformity (Asch, 1951), obedience (Milgram, 1963), Stanford Prison Experiment (Haney, Banks and Zimbardo, 1973)
- Exam 6 — Elaboration Likelihood Model (ELM) — central and peripheral routes to persuasion (Petty and Cacioppo); Tri-component attitude model (cognitive, affective, behavioural); Cognitive dissonance (Festinger)
- Exam 7 — Unit 3 Topic 1: Nervous system, neurotransmitters, brain function, Parkinson's and Alzheimer's disease; Unit 3 Topic 2: Visual perception, illusions, cross-cultural studies; Unit 3 Topic 3: Working memory model (Baddeley and Hitch, 1974), levels of processing (Craik and Lockhart, 1972)
- Exam 8 — Milgram obedience paradigm and proximity conditions; Social influence: conformity (Asch), obedience (Milgram), group processes (Stanford Prison Experiment); Bystander effect (Latane and Darley) and prosocial/antisocial behaviour
- Exam 9 — Visual perception and cross-cultural depth cues (Hudson paradigm); Localisation of brain function and neural transmission; Memory models: working memory (Baddeley & Hitch) and levels of processing (Craik & Lockhart)
- Exam 10 — Stanford Prison Experiment (Haney, Banks and Zimbardo, 1973) — situational vs dispositional explanations of behaviour; Social influence: conformity (Asch, 1951) and obedience (Milgram, 1963); Group processes: deindividuation, role adoption, authority
- Exam 11 — Bystander effect and prosocial behaviour (Latane and Darley, 1968/1970); Diffusion of responsibility, audience inhibition, social influence mechanisms; Group size effects on intervention rates
- Exam 12 — Parkinson's disease — dopamine depletion in substantia nigra, motor symptoms (tremors, rigidity, postural instability); Localisation of brain function — basal ganglia, cerebellum, motor cortex; Synaptic transmission — neurotransmitter roles, receptor binding, inhibitory/excitatory signalling
- Exam 13 — Classical conditioning: CS, UCS, CR, UCR, acquisition, generalisation, discrimination; Stimulus generalisation applied to bell anxiety scenario; Watson and Rayner Little Albert study
- Exam 14 — Unit 3 Topic 1: Brain localisation, nervous system, synaptic transmission, Parkinson's disease, Alzheimer's disease; Unit 3 Topic 2: Visual perception, retinal processing, psychological/social/cultural influences, named illusions, cross-cultural studies; Unit 3 Topic 3: Working memory (Baddeley & Hitch 1974), levels of processing (Craik & Lockhart 1972)
- Exam 15 — Working Memory Model (Baddeley & Hitch, 1974) — phonological loop, articulatory suppression, dual-task methodology; Levels of Processing (Craik & Lockhart, 1972) — depth of processing, elaborative rehearsal; Brain localisation and neurotransmitter function — Parkinson's disease, Alzheimer's disease, synaptic transmission
- Exam 16 — Unit 3 Topic 1: Localisation of brain function, nervous system, synaptic transmission, neurotransmitters, Parkinson's disease, Alzheimer's disease; Unit 3 Topic 2: Visual perception, retinal reception, psychological/social/cultural influences, named illusions, cross-cultural studies; Unit 3 Topic 3: Working memory (Baddeley & Hitch 1974), levels of processing (Craik & Lockhart 1972)
- Exam 17 — Elaboration Likelihood Model (ELM) — peripheral vs central route processing; Tri-component attitude model (cognitive, affective, conative); Cognitive dissonance (Festinger)
- Exam 18 — Observational learning / Bandura's social learning theory — model consequence conditions (reward, punishment, vicarious reinforcement/punishment); Classical and operant conditioning compared with social learning; Working memory model (Baddeley and Hitch 1974) and levels-of-processing (Craik and Lockhart 1972)
- Exam 19 — Cognitive dissonance and attitude change (Festinger; tri-component model; ELM); Localisation of brain function; synaptic transmission; neurotransmitters (Parkinson's, Alzheimer's); Visual perception; illusions; cross-cultural influences
- Exam 20 — Localisation of brain function and neurotransmitter roles (Unit 3 Topic 1); Visual perception and cross-cultural influences (Unit 3 Topic 2); Working memory model (Baddeley and Hitch) and levels of processing (Craik and Lockhart) (Unit 3 Topic 3)
All 20 revision notes
- Organisation of the Human Nervous System
- The Neuron and Synaptic Transmission
- Localisation of Function and Neurotransmitter Roles
- From Reception to Interpretation: The Visual Perception Process
- Perceptual Set, Gestalt Principles, Depth Cues, and Cultural Influences
- Visual Illusions and the Fallibility of Perception
- Sensory, Short-Term, and Long-Term Memory Characteristics
- Working Memory Model and Levels of Processing Model
- Classical Conditioning: Pavlov, Watson and Rayner, and Key Concepts
- Operant Conditioning, Schedules of Reinforcement, and Observational Learning
- Conformity, Obedience, and Social Influence Processes
- Group Processes: Groupthink, Deindividuation, Social Loafing, and Conformity to Social Roles
- Factors Affecting Prosocial Behaviour and the Bystander Effect
- Factors Influencing Aggression and Media Effects on Behaviour
- Tri-Component Model of Attitudes and How Attitudes Form
- Elaboration Likelihood Model, Cognitive Dissonance, and Prejudice
- Culture Shock: Oberg's Four Stages and Berry's Acculturation Strategies
- Ethnocentrism, Cultural Relativism, and Cross-Cultural Research Limitations
- Reducing Prejudice Towards Immigrants and Minority Groups
- How Social Context Shapes Attitudes, Stereotypes, and Behaviour