posted on Dec, 17 2016 @ 05:14 PM
a reply to: tikbalang
Mild Cognitive Impairment is complicated as it isn't a disease, just a noticeable decline in cognitive performance that could be down to anxiety, low
mood, lifestyle (sleep, diet etc) - so definitely external.
With dementia, there are no official causes, but many agreed risk factors, and they may depend on the type. Alzheimer's Disease is caused by build up
in the brain of amyloid-beta and hyper-phosphorylation of tau protein. There may a genetic link, as some families seem more susceptible than others,
and there are a small number of people who appear to be immune. Other research has suggested lack of stimulation of the brain (perhaps lack of
activity, including social, after retirement) and even feelings of loneliness may predict onset. Truth is no-one knows for sure.
Vascular dementia relates to weaker blood vessels in the brain and so risk factors and preventative measures focus more on what is good for the heart.
Poor lifestyle choices, cigarettes, alcohol, and lack of exercise may be seen as enhancing the risk. Strokes, mini-strokes are seen as major risk
The addiction question is a massive one - in short when we experience something we enjoy it activates the reward pathways of the brain (dopeminergic
activation in limbic regions and pre-frontal cortex). Frequent exposure to something rewarding (success, drugs etc) strengthens the connections of
those pathways (neural plasticity). This process ensures that more exposure is required on future occasions to obtain the desired effect.
Individual differences play a huge role in psychology, so what leads one person to become addicted whilst another may not depends on the interaction
of situational/social factors that are affecting them, and dispositional factors such as stress.