Essentials: Understanding & Conquering Depression

In this Huberman Lab Essentials episode, Andrew Huberman, a professor of neurobiology and ophthalmology at Stanford School of Medicine, turns to depression and specifically to major depression. He uses the term to separate it from the other main form, bipolar depression. His opening claim is about scale. Major depression, he says, impacts 5% of the population. In a class of a hundred people, five would be dealing with it now or would have dealt with it at some point. He also says that in any setting, a good portion of the people around you are affected by depression now or will be later.

So, this is something we really have to take seriously, and that we want to understand.

He adds a second measure of burden: major depression is the number four cause of disability. He says many people miss work or school because of it, and that before reaching that point they likely perform poorly at work or school. He gives no source for either the prevalence figure or the disability ranking in this section.

Huberman starts with the symptoms most people would expect, a lot of grief and a lot of sadness. He then introduces anhedonia, which he defines as a general inability to enjoy things or to achieve or experience pleasure. He links it to a flattened emotional presentation. He also says major depression can sometimes involve negative delusional thinking, in particular what he calls anti-self confabulation.

To explain confabulation, he turns to people with memory deficits caused by brain damage or age-related dementia. Someone with age-related dementia may find themselves somewhere in the house without knowing how they got there. Asked what they are doing, they may produce an elaborate story about planning to go shopping and take the bus. He describes this as the mind generating narrative that is not anchored to what actually happened.

It's as if a brain circuit that writes stories just starts generating content.

In major depression, he says, this story-making often takes a delusional, anti-self form. The stories are not directly or completely linked to reality, and they portray the person telling them as sick or in some way not well.

His concrete illustration is someone, perhaps an athlete, who breaks an ankle and also becomes depressed. Asked about rehab, the person says they feel weaker by the day and are not performing well. Their physical therapist or kinesiologist says the opposite: the person is actually improving and has been told so, but somehow does not register it. Huberman's point is that the self-deprecating view becomes so strong that it no longer matches reality.

Huberman then turns to what he calls vegetative symptoms. These occur without any thinking, doing or confabulation, and they are tied to core physiology. The first is constant exhaustion: the person no longer has the energy they once had. He stresses that this is not imagined. In his words, "it's not in their heads," and something is disrupted in the autonomic, or so-called vegetative, nervous system.

He calls early waking one of the most common signs of major depression. People wake spontaneously at 3:00 AM, 4:00 AM or 5:00 AM and cannot fall back asleep, even though they are exhausted. He then explains normal sleep architecture. Early in the night, slow wave sleep tends to dominate over REM (rapid eye movement) sleep, and REM becomes more frequent as the night goes on. He says this ordering is radically disrupted in major depression. The pattern of brain activity during particular sleep phases is also disrupted.

He also covers functions that relate to the autonomic nervous system but that we usually think of as more voluntary, such as appetite. Decreased appetite is common. He offers a tentative link to anhedonia, saying one "could imagine" reduced appetite following from a lack of pleasure in food. He frames this as a possible explanation, not an established mechanism.

Pulling these together, he describes depression as acting on several levels at once. At the conscious level, general excitement is reduced, and there is grief, guilt and crying. Alongside that come the vegetative disruptions. He points out that broken sleep makes waking life harder, since sleep is vital for resetting. Waking early and being unable to get back to sleep pushes affect and emotions in negative directions.