Is Drug Treatment Too Reductionist?

The last two pages both assumed the same thing: a chemical problem, so a chemical solution. This page puts that assumption on trial. It is the most philosophical topic in the sub-unit and also the easiest place to pick up marks, because most students can define reductionism but very few can argue with it.

Levels of explanation

The point of the ladder below is not that one rung is right and the others wrong. It is that the same case of depression can be truthfully described at every level, and each description leaves something out.

Where reductionism shows up in this topic

• The monoamine hypothesis assumes abnormal serotonin levels cause depression.
• Drug therapies such as SSRIs and NRT assume behaviour results from neurochemical imbalances.
• Genetic explanations of MDD assume depression is highly heritable, which pushes environmental influences into the background.
• By contrast, a holistic account of the same case would consider biology, thinking style, relationships, income and culture together.

Evaluation of biological reductionism

Strengths

• Scientific clarity. Narrowing the question makes it answerable, measurable and comparable across studies.
• It isolates variables. Studying one factor, such as dopamine and addiction, makes it far easier to design studies and test hypotheses properly.
• Practical applications. Reductionist work on serotonin transport led to effective drug therapies including SSRIs, and to NRT for nicotine addiction. Real treatments came out of it.
• It made psychology more credible as a science, because objective, replicable methods could be applied to problems that had previously been described only in words.

Limitations

• Oversimplification. Human behaviour is complex, and reducing it to one gene or one neurotransmitter neglects lived experience — stress, trauma, poverty, social support.
• The mechanism is not fully understood. Drug therapies reduce symptoms, but it remains unclear exactly why, or how much of the improvement is placebo.
• It can misdirect treatment. If depression is treated only as a chemical problem, the job loss or the abusive relationship that triggered it is never addressed.
• It removes the person from the picture. A patient becomes a set of receptors rather than someone with a history.

Link to concepts

Perspective

Levels of explanation are part of reductionism, and they raise the question of whether psychology counts as a science in the way physics does. Psychology cannot follow the laws of the “hard” sciences, so it uses levels of explanation instead. Kuhn (1990) described psychology as a pre-science for exactly this reason: it lacks a single agreed paradigm, and several approaches compete at once.

Change

A paradigm is a set of shared assumptions and methods — the biological approach’s assumption that depression results from a neurochemical imbalance is one. A paradigm shift happens when a field moves forward through a scientific revolution: new ideas gain traction, research accumulates that contradicts the old assumptions, and eventually the old paradigm is discarded. The classic example is the discovery that the earth is round rather than flat.

Something like this happened in mental health. The biological approach moved to the forefront of research in the 1980s as scanning and measurement technology improved, and that line runs through to cognitive neuroscience today. Whether the pendulum is now swinging back towards holistic, whole-person treatment is a live question — and a good essay can say so.