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Depression (Types (Major depressive disorder (depressed mode, diminished…
Depression
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Is it good for you?
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Andrews
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Claims
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Depression coordinates changes in body system that promote sustained analysis of the triggering problem
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Depression reduces performance on performance on laboratory task because depressive rumination takes up limited processing resources
Biological mechanisms
(a) It reduces the chance that analytical processing will
be interrupted by inducing anhedonia, inducing psychomotor
changes, and recruiting the left VLPFC to enhance attentional
control;
(b) by increasing 5-HT, it stimulates lactate production in
nearby astrocytes, providing the energy needed to sustain VLPFC activity;
(c) 5-HT drives glutamate-glutamine cycling so that glutamate is cleared out of the synapse and the loss of neuronal tissue that can occur under sustained glutamatergic transmission is reduced.
Paradoxical findings
1 Depression is associated with difficulty concentrating
but depression is also is associated with persistent ruminations
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2 Depressed affect causes performance decrements on laboratory tasks in many cognitive domains
but it also promotes an analytical processing style
that enhances performance on many cognitive tasks
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4 Preexisting depression is associated with reduced accuracy on
some tasks and greater accuracy on others
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5 Antidepressants improve cognitive functioning in those with
preexisting depression, but antidepressants impair nondepressed participants’ performance on tasks involving vigilance and high working memory loads.
effective antidepressant would disable attentional control mechanisms, but they are not always effective
6 Disruption of depressive rumination temporarily alleviates
depressed symptoms,
but systematic disruption is associated with longer episodes
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7 Different ruminative styles are associated with different
longitudinal effects on depressive symptoms
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Models
Cognitive model (beck)
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Negativity
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hopelessness, loss of motivation, self-criticism, suicidal wishes
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Definition
affective state, ahedonia, changes in sleeping, eating