Historically, Seasonal Affective Disorder (SAD) has been understood as being the result of one of two binary positions: biological (your genetic composition) or environmental (learned behaviours and other external influences). In more recent years, it has become widely accepted that the two elements feed into each other. That means that while people have predispositions toward depression, that depression is simultaneously affected by an external influence (in this case winter). SAD is made distinct from other types of depression due to its temporal pattern. Major episodes begin in the winter, and there is always a full emission in the spring.
Let’s take a quick look at the two factors before seeing how they link into each other.
Is It in The Genes?
The bracket of “Biological Vulnerability” covers a vast field of potential reasons one experiences SAD – but is generally understood as a rhythmic abnormality in the winter. This simply means, a biological composition or a natural disposition to biological changes in winter causes SAD. Some of the most well understood reasons are as follows: there could be a delay or advance in the release of melatonin (the hormone that tells us it’s time to sleep), a retinal sensitivity to light, a dysfunction between neurotransmitters (the chemical substance which sends messages between nerves), a genetic variation in brain composition, and a reduced release of serotonin.
SAD can be a result of one or more of these biological aspects, but more often than not, they are emphasized by psychological factors.
How Our Environment Can Make Us SAD
Depression is understood as an interaction between a cognitive vulnerability to depression (as we looked at above) and a stressor. There are different cognitive models that propose different vulnerabilities, let’s take a look at the main ones.
Alongside the genetical predisposition, it is common for the sufferer to also be affected by one of the following: a dysfunctional attitude (learned negative attitudes and outlook on the world), rumination (focusing attention on dysphoric moods and/or potential negative consequences), and a negative attributional style (catastrophizing negative events to a global scale). These aspects are usually interwoven.
Once a predisposition is influenced by one of these negative cognitive aspects, this combinatorial (see below for a visual representation of this process). All of these cognitive aspects are stressors.
Combining the Two.
Source: Biological and Psychological Mechanisms of Seasonal Affective Disorder: A Review and Integration. Kelly J. Rohan, Kathryn A. Roecklein, and David A.F. Haaga. Current Psychiatry Reviews, 2009, 5., 37-47
As we can see following the graph, the environmental aspect (on the left) can run its own path to SAD, as can the biological (on the right). It is widely accepted that the psychological vulnerability and the physiological vulnerability feed into each other (as seen with the double-arrow that links the two sides together).
If you would like to learn more about the symptoms of SAD click here.
If you would like an introduction to one of our physicians that specializes in SAD click here.
SAD can have an extremely negative impact on your quality of life. If you need a consultation, or are suffering from any of the symptoms outlined at the end of the article, please contact us on (212) 241-6321 to book an appointment.
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