A decrease in the light in autumn and winter causes depression like seasonal affective
disorders (SAD) in sensitive patients, in which the serotonin (5-HT) and dopamine (DA) …

Reduction of natural illumination in fall/winter months causes seasonal affective disorders
(SAD) in vulnerable individuals. Neurotransmitter serotonin (5-HT) is involved in the …

Seasonal affective disorder (SAD) is characterized by recurrent depression occurring
generally in fall/winter. Numerous pieces of evidence indicate the association of SAD with …

Abstract ِAim Tryptophan hydroxylase-2 mRNA (TPH, the rate limiting enzyme in 5-HT
synthesis) expression levels display circadian variations in the median and dorsal raphe …

Abstract Tryptophan hydroxylase-2 mRNA (TPH, the rate limiting enzyme in 5-HT synthesis)
expression levels display circadian variations in the median and dorsal raphe nuclei. This …

Introduction Many experience low mood and energy during winter. Brain serotonin is
involved in the regulation of many physiologic and pathologic functions that vary with …

Seasonal Affective Disorder (SAD), seasonality and increased sensitivity to the fluctuation of
seasons in biological and psychological parameters can manifest to varying degrees across …

Seasonal Affective Disorder (SAD) is characterized by patterns of major depressive
episodes that occur and remit with the change of seasons. Two seasonal patterns have …

Seasonal affective disorder is characterized by depression during fall/winter as a result of
shorter daylight. Catalepsy is a syndrome of some grave mental diseases. Both the …

There is some evidence that the neurotransmitter serotonin (5-hydroxytryptamine; 5-HT) may
be involved in the pathogenesis of seasonal affective disorder (SAD). Short-term tryptophan …