It has been shown in this study that there is a significant relationship between depression and cognitive
impairment. One reason for this correlation is the theory of cognitive changes associated with frontal lobe. One
potential mechanism that supports the cognitive functions is cortical-stratum-palidemy-cortical which is strongly
associated with the executive cognitive functions of the frontal lobe. On the other hand, PET imaging technique has
been shown that this circle is affected to abnormalities (decreased glucose metabolism and decreased blood flow).
Not only can it be the result of cognitive inefficiencies in depressed elderlies, but the result of reduced cerebral
metabolism related to age or brain volume loss in peri-frontal and orbito-frontal. Here is an issue noteworthy
whether this is the defects in the cognitive functions of the brain that cause depression or it may be the result of
cognitive impairment. It can be justified in that an elderly individual is affected to depression with awareness to
his/her own cognitive impairment and suffering from it