Essentials: Understanding & Treating Addiction | Dr. Anna Lembke

Anna Lembke introduces dopamine as a neurotransmitter that allows neurons to communicate, with roles in both reward and movement. She connects those functions through the example of early humans moving to obtain water or meat. Dopamine contributes to pleasure, but she explicitly notes that it is not the only neurotransmitter involved. Her central distinction is between ongoing, tonic dopamine release and deviations from that baseline: in her account, release above baseline accompanies pleasure, while a fall below it accompanies a kind of pain.

When Huberman asks whether baseline dopamine corresponds to happiness or depression, Lembke gives a qualified answer: some evidence suggests that people with depression may have lower tonic levels. She also says that repeated exposure to substances or behaviors that release large amounts of dopamine can lower the baseline as the brain compensates. She describes an inherited starting point as probable, particularly early in development, while emphasizing that experience can substantially change where dopamine levels settle. Asked whether dopamine lies at the core of temperament, she says the answer is not known. Differences in temperament and the capacity to experience joy do not, in this discussion, establish a single dopamine explanation for depression.

Lembke identifies impulsivity as a trait associated with greater vulnerability to addiction: a person has a thought and acts on it without much delay. But she resists treating the trait as inherently bad. Her broader interpretation is that some traits understood as mental illness in one environment might be advantageous in another. In an environment full of sensory opportunities, people must repeatedly inhibit impulses, making impulsivity especially difficult to manage.

Huberman raises a related observation from an earlier conversation: some people who develop addictions feel that ordinary life is insufficiently interesting. Lembke argues that contemporary life can be difficult because it is boring, particularly when a certain level of financial security allows physical needs to be met without leaving home. She acknowledges an enormous gap between rich and poor while also claiming that the gap is smaller than at any previous point in human history. The excerpt supplies no evidence for that historical comparison, so it remains a claim within her argument.