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Brain imaging

AP Psychology
by

Maria Vita

on 28 September 2016

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Transcript of Brain imaging

How do psychologists study brain?
Brain imaging
PHRENOLOGY
A closer look
Using injury to the brain as a way to
understand it's
structure and function
LESIONS
MEASURE BRAIN ACTIVITY ONLY! Not structure
EEG or electroencephlagram
Typical X-ray
CAT or CT Scan
Patients DRINK radioactive glucose and then scans show BRAIN metabolizing the glucose
PET or positron emission tomography
Magnetic fields and radio waves record images:
THESE Are the MOST DETAILED
MRI or magnetic resonance imaging
fMRI functional MRI
Documents "electric" signals from scalp or brain (neurons)
Brain with evidence of concussion, bleeding/swelling: Sometimes concussions are FUNCTION problems one cannot see on a CT CAT scan
Can reveal tumors, stroke, bleeding; better visual of hard-tissue (bone), but can reveal contrast in soft tissue/brain
CT scan (left) vs. MRI (right) of head injury after car accident
WARNING: VIDEO HAS GRAPHIC CONTENT
CRITICISMS

Correlation does not mean causation

Areas of the brain are "associated"
with certain functions

"depending on...neurotransmitters...[there] may actually be ...inhibit[tion] rather than excit[tion] (Satel and Lilienfeld, 2013).

Could there be false positives?
Dead salmon shown photos in
fMRI - p < 0.001 !!!!
Contralateral movement of hand
Ipsilateral cerebellum activity:
THIS IS MIKE HAMILTON'S BRAIN -
AP Psychology teacher Hopkinton
WARNING! The misconception here is to believe there is a brain. This ONLY shows radioactive metabolic activity. The anatomy of brain is NOT shown.
Warning: Another misconception is to see "holes" or missing brain matter where there is little/no activity. Remember, there is no brain structure shown.
A technician
can
outline
structure;
however,
the activity
is only
associated/
correlated
with an area
View the greater detail of MRI!
CAT does a better job on hard tissue/bone.
Full transcript