nervoy Flashcards
1
Q
What is Autonomic nervous System?
A
The sympathetic and parasympathetic divisions work together to support homeostasis
2
Q
What does the central nervous system does ? which is the spinal cord
A
- Connects most of PNS with brain
- Grey matter in centre , white matter outside
- Sensory neurons enter at the rear
- Motor neurons exit via the front
- Can produce reflex responses
- 1300-1400g in adults
- 2% of body weight
- 20 % of energy use
- 86 billion neurons
- 51 trillion synapses
- Has gray matter outside and white matter inside
3
Q
Explain MRI
A
- Spinning protons have tiny mangetic fields
- Apply strong magnetic field and they align
- Beam radio waves to perturb them
- Turn off radio waves and they relax back
- … releasing radio waves
- Time course dpends on the environment
4
Q
What is DTI
A
- Graded magnetic fields probe diffusion of water
- Axons are like straws , so DTI identifies white matter tracts
5
Q
What is microelectrode recording
A
- Electrode array records activity while the patient performs tasks
- Can record single cell activity
- Limited opportunities for implementation
6
Q
What is electroencephalography ?
A
- Detect voltages via net of electrodes on scalp
- (Reflects graded postsynaptic potentials, not action potentials)
- High temporal precision
- Spatial origin of the signals is unclear
- Can detect regular oscillations (“brain waves”)…
- …and event-related potentials (ERPs)
7
Q
What is magnetoencephalography
A
- Detect changes in magnetic field caused by electrical activity
- High temporal resolution
- Better spatial resolution than EEG because…?
- Detect changes in magnetic field caused by electrical activity
- High temporal resolution
- Better spatial resolution than EEG because there is less distortion by skull and skin
8
Q
Explain Functional MRI
A
- Detect changes in blood flow to areas using oxygen
- Poorer temporal resolution than EEG/MEG because changes in blood flow take time
- Better spatial resolution than EEG/MEG
- Can probe subcortical structures
- E.g., Dr Petrini and colleagues investigating effects of audio-visual synchrony on drummers and novices
9
Q
Explain function near infrared Spectroscopy
A
- Detect changes in blood flow by measuring absorption of IR light
- Poor temporal resolution
- Worse spatial resolution than fMRI
- (Relatively) cheap and easy
- Person can move!
10
Q
What is positron emission Tomography
A
- Inject radiolabelled glucose or neurotransmitter
- Radioactive decay => gamma radiation
- Allows 3D reconstruction of energy or NT activity
