3- Intro to neuropsychology Flashcards
(34 cards)
Flatworm nervous system
Chemoreceptors to locate food
Eyespots sensitive to light (light avoided)
What is the central nervous system?
Essentially the brain and the spinal cord.
The spinal cord provides sensory information to the brain. Brain processes this information and sends motor commands to muscles
What is the peripheral nervous system?
Everything beyond the spinal cord. Nerve fibres from CNS to rest of body.
The peripheral nervous system can regenerate tissue when damaged, UNLIKE CNS.
Cut finger, nerves will regenerate. Stroke, nerve cells in brain will not regenerate. Why? specialisation of nerve cells in CNS.
What is the peripheral nervous system divided into?
Autonomic NS= controlling internal activities of organs and glands
Somatic NS= controlling external actions of skin (sensory connections) and muscles (motor connections)
What is the autonomic nervous system divided into?
Sympathetic (arousing) ‘fight or flight’
Parasympathetic (calming)
What structure links the spinal cord to the brain?
Brain stem
What are the components of the brain stem?
Medulla (first connection between brain and spinal cord)
Pons
Midbrain
What is the function of the medulla?
Mediates essential functions e.g. breathing, heartbeat
What is the function of the pons.
Relay station related to breathing, sleep and arousal- noradrenaline network. Sympathetic system and ‘fight or flight’
What is the function of the midbrain?
Secondary perceptual roles:
Vision: superior colliculus- eye movement and gaze. input from retinal to visual cortex CROSS at superior colliculus.
Hearing: inferior colliculus- sound localization. CROSS at inferior colliculus.
Movement: substantia nigra- connections to basal ganglia, implicated in Parkinson’s disease. Also related to reward and addiction.
Function of Parietal lobe
Spatial orientation. Disorders of spatial neglect if lesion. Somatosensory cortex
Function of occipital lobe
Visual cortex
Function of temporal lobe
Language, auditory cortex, facial recognition (fusiform gyrus), semantic memory
Function of the frontal lobe
Primary motor cortex
Prefrontal=executive functions, inhibition, personality
Basic divisions of the central nervous system= hindbrain, midbrain and forebrain. What is in each?
Hindbrain:
Medulla oblongata (part of the brainstem)
Pons (part of the brainstem)
Cerebellum (Motor control, posture etc)
Midbrain (part of brainstem)
Forebrain:
Hypothalamus, thalamus, mammillary bodies (collectively the diencephalon)
Basal ganglia
Limbic system containing the amygdala and hippocampus
Cerebral cortex- four bilateral lobes
Function of thalamus
Part of diencephalon. Relay centre for sensory info before it travels up to cortex.
Function of hypothalamus
Autonomic nervous system, controlling body temp, hormones, sleep-wake cycle.
Function of the cerebellum
Coordinates movements, maintains posture and equilibrium. Balance and proprioception.
What is encephalization quotient?
Size of brain relative the size of animal. Humans= large EQ. Most extra brain size due to cerebral cortex, achieved through cortical folding.
Large brains cost energy - about 20% of our diet.
What are possible factors for humans increasing brain size?
Social co operation, change in diet, lifestyle (harnessing of fire for cooking resulted in increased calorie intake), adaptation to climate change.
Early approaches to psychology and the brain: Materialism.
Materialism- rational behaviour explained by the working of the nervous system. Key observation: damage to the brain effects behaviour.
The cognitive revolution- Chomsky’s view of language
Innate lang learning abilities. LANG CANNOT SIMPLY BE PRODUCED BY IMITATIONA & REINFORCEMENT
Information processing models
Computational metaphor, task-specific cognitive systems. Flow of info.
Modularity hypothesis
Central processor obtains information via a number of input systems:
Domain specificity:
Modules only operate on certain kinds of inputs:
Specialised for a particular purpose.
Neuroimaging techniques reconnect mind and brain, previously mainly post-mortem