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NEUROPLASTICITY 22 - Coggle Diagram
NEUROPLASTICITY 22
bremner (2003)
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p
33 women, 3 groups; early childhood sexual abuse and ptsd (10), abuse without ptsd (12), no abuse or ptsd (11). mri to measure volume of hippocampus, pet scan to measure level of functioning during verbal declarative memory test
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abused women with ptsd had 16% smaller hippocampus volume compared to women with abuse and no ptsd, showed lack of activity when doing memory task
linking
bremner demonstrates how neuroplasticity affects the brain and behaviour. for example, women that were abused and showed symptoms of ptsd were found to have 16% smaller volume of the hippocampus compared to with abuse and without ptsd. this is important because the fact that they are actively suppressing their memories as an effect of ptsd, it is causing there to be less and weaker neural connections and pathways. this causes the size of the hippocampus to get smaller. therefore...
ct
strength
high internal validity
control groups, increases reliability that IV is sole influence on DV
weakness
gender bias
reduces generalisability across a target pop, important to use men too
maguire(2000)
aim
to investigate the effect of navigational memory on the size of the hippocampus on london taxi drivers
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quasi experiment
a naturally occurring iv, a difference between people that already exists, researcher examines the effect of this variable on the dv
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two groups: london taxi drivers (experimental) and non-taxi drivers (control) that had mris to examine the structure of the brain, pixel counting was used to measure the size of the brain, providing quantitative data
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london taxi drivers have a larger posterior hippocampus and non-taxi drivers have a larger anterior hippocampus
linking
maguire demonstrates how neuroplasticity affects the brain and behaviour. for example, the experimental group (london taxi drivers) had a larger posterior hippocampus. this is important because, as all london taxi drivers complete the knowledge, this forms more neural connections and well established neural pathways which increases the size of the posterior hippocampus. therefore...
ct
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weakness
low generalisability
LONDON, other places don't have the knowledge, low cross-cultural validity
rosenzweig, bennet and diamond (1972)
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rm
lab experiment
highly controlled conditions where accurate measurements are possible, participants are randomly allocated to the iv
p
rats in enriched condition or impoverished condition (ec and ic); ec - 10-12 rats, stimulus and objects to play and maze training (reward based activity), ic - rats in individual cages, no toys or maze training, rats spent 30-60 days in environment before killed to study brain anatomy
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anatomy different in ec and ic, increased thickness and weight in cortex of rats from ec, ec rats had greater activity in neurons, cerebral cortex associated with acetycholine, learning and memory, maze training
linking
rba demonstrate that neuroplasticity does affect behaviour. for example, the rats in the ec had an increased weight and thickness of the cerebral cortex. this is important because the stimulation of the ec for the rats created more neural connections and well established neural pathways. therefore ...
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intro
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brain plasticity refers to the brains ability to rearrange the connections between its neurons and alter its own structure as a result of learning or an experience. The brain is most plastic at birth, teenagerhood and after an injury.
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s
bremner (2003), maguire (2000) and rosenzweig bennet and diamond (1972)
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