PsychoBrain. 31 st January Dr Christos Pliatsikas. Lecturer in Psycholinguistics in Bi-/Multilinguals University of Reading
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1 PsychoBrain 31 st January 2018 Dr Christos Pliatsikas Lecturer in Psycholinguistics in Bi-/Multilinguals University of Reading
2 By the end of today s lecture you will understand Structure and function of the brain Methods used to study the brain
3 The Brain Grouping of nerve tissue within the skull Weighs around 1.4kg Creates consciousness, judgment, thought, memory and emotion Heads the nervous system that allows our body to complete basic functions that keep us alive
4 What s in your head?
5 Hemispheres of the Brain Divided into 2 almost Identical Halves: Cerebral Hemispheres Covered by three membranes (meninges) a) Dura b) Arachnoid c) Pia
6 Hemispheres linked by two bundles of fibres (white matter): -Corpus Callosum -Anterior commissure
7 Some neuroanatomy Grey matter (GM): The collection of the brain s cell bodies ems%20images/neuron.png.jpg White matter (WM): The collection of the brain s axons 7
8 Organisation of the cerebral cortex higher functions
9 The Senses Information from sensory organs received by: Primary visual cortex Primary auditory cortex Primary somatosensory cortex (taste, touch) Gustatory (taste) and olfactory (smell) cortices Associations between sense organs and cerebral cortex are contralateral
10 Control of movement Different parts of the primary motor cortex are connected to muscles in different parts of the body Associations are contralateral too
11 Motor and sensory areas
12 Cortical specialisation and brain plasticity The functional specialisation of the cortex is not necessarily static The role of specific regions can be reassigned For example: Patients with stroke: Initial inability to speak ( aphasia ), which improves with time and therapy. Why? Regions near the ones destroyed take over the functions of speaking Congenitally blind people show activation of the occipital cortex for tactile Braille reading An otherwise unused brain region takes over for a newly acquired skill
13 Discuss People use 10% of their brain Myth!
14 Studying the brain Accidental damage e.g. Phineas Gage Stroke, e.g. Broca s & Wernicke s regions Brain surgery Non-invasive recording techniques e.g. EEG, fmri Non-invasive neurostimulation, e.g. TMS
15 Lesion studies Initially the only available method to study the functions (or lack of) of the brain. The anatomo-clinical method: Patient behaviour was observed and recorded, and linked to brain damage post-mortem. Paul Broca (1861): One of his patients had problems in speaking Only simple syllables could be produced ( tan ) Post-mortem analysis revealed extensive damage in a posterior area of the Left Inferior Frontal Gyrus (LIFG) The area was named after Broca It has been known to be crucial for speech production
16 Brain surgery Corpus callosotomy severing corpus callosum split-brain patients - information cannot be passed between hemispheres
17 Fixate on central point, present stimulus to one visual field Visual-field studies Information from left visual field goes to right hemisphere and vice-versa In split-brain patients, information cannot pass between hemispheres Image: Accessed 6/11/5
18 Image:
19 Discuss There are right- and left-brained people This visual illusion supposedly tells you whether you are right or left brained: ch?v=ilahdcfa9eg&feature=re lated See if you can change the direction of the dancer Myth!
20 Non-invasive recording Measuring Electrical Activity: EEG: Electrodes attached to the scalp and record electrical activity (action potentials from groups of neurons) Looking at the Whole Brain (Imaging): fmri: Detecting which particular brain areas are involved in particular types of processing Brain Stimulation: TMS: Potentials are triggered at specific brain areas to define their function
21 Modern EEG recording Brain activity measured by electrical impulses is now recorded and analysed using computers
22 Magnetic Resonance Imaging (MRI) Uses magnetism to build up a picture of the inside of the body. 3D representation of the brain functional MRI (fmri): Looking at localisation of brain function in real time Brain activity as a response to specific stimuli The more active the neurons become, the more blood is needed Pliatsikas et al.(2014a): Brain regions activated for the processing of grammatically complex words E.g. played (play + ed)
23 Magnetic Resonance Imaging (MRI) Structural MRI: Looking at the brain s structure Similar methods and identical equipment to fmri Looking at structural effects in the brain Grey and white matter Pliatsikas et al. (2014b): Cerebellar volume in non-native speakers correlates with how fast they are in a grammatical task.
24 Transcranial magnetic stimulation (TMS) Strong magnetic field creates electrical currents in the brain Can target cortical areas as small as 1 cm 2 Those currents can cause or disrupt a function Visual: phosphenes Language: speech arrest
25 Discuss There are male brains and female brains Myth!
26 Thank you! 26
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