The brain and behaviour

The Brain and Behaviour

Brain Structures and their Functions

  • Cerebral cortex: The outermost layer of the brain involved in various higher cognitive processes like memory, attention, and consciousness.
  • Corpus callosum: Connects the two hemispheres of the brain and allows them to communicate with each other.
  • Hippocampus: Involved in the formation of new memories.
  • Amygdala: Associated with experiences of fear and other emotions.

Brain Plasticity

  • Neuroplasticity: The brain’s ability to reorganise itself by forming new neural connections throughout life.
  • Synaptic pruning: A process whereby the brain eliminates extra synapses.
  • Critical periods: Specific times during early development when the brain is particularly susceptible to environmental influences.

Neurotransmitters and Behaviour

  • Serotonin: Influences mood, impulsiveness, and aggression. Low levels are associated with depression.
  • Dopamine: Plays a critical role in the way our brain controls our movements and is implicated in diseases like Parkinson’s. It’s also connected to reward and pleasure systems.
  • Acetylcholine: Involved in learning and memory. Diminished function is associated with Alzheimer’s disease.

Hormones and Behaviour

  • Adrenaline: Produced in response to stress and increases heart rate, blood pressure, and energy supplies.
  • Cortisol: Released in response to stress and low-glucose concentration.
  • Oxytocin: Promotes bonding and trust, released during social contact and intimacy.

Genetic Influences on Behaviour

  • Genetic predisposition: An individual’s inherited tendency to have certain behaviours, diseases or traits.
  • Heritability: The proportion of variation among individuals that can be attributed to genes.
  • Genes and behaviour: Multiple genes often work together to determine behaviour, a concept known as polygenic inheritance.

Brain Imaging Techniques

  • MRI (Magnetic Resonance Imaging): A type of brain scan that uses a strong magnetic field and radio waves to create detailed images of the brain.
  • fMRI (Functional Magnetic Resonance Imaging): Measures brain activity by detecting changes associated with blood flow.
  • PET Scan (Positron Emission Tomography): Injects a radioactive substance into the blood and monitors its flow and usage in the brain.
  • CT Scan (Computed Tomography): Uses a series of X-ray images to create detailed pictures of the brain.

Remember, any of these points are potentially exam-worthy, so focus your revision carefully.