Equation 7 · Part 1 · Prepared Fears: How Evolution Biased What the Mind Learns to Dread
Symbol α
What this part means
a learning-rate parameter governing how much of the gap between the two is closed on a given trial.
Its job in the formula
α is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol α→Article meaning
Where the article explains it
A standard error-correction rule for associative strength states the update on each learning trial as V = \,( - V) where V is the current associative strength between a stimulus and an outcome, is the asymptotic strength that outcome supports, and is a learning-rate parameter governing how much of the gap between the two is closed on a given trial.
The passage around this formula
…like, without needing an additional assumption. Exposure-based treatment works by driving V back down toward zero through repeated, non-reinforced exposure to the feared stimulus — a description that says nothing about at all. If preparedness operates on the learning rate for acquisition rather than on some separate, treatment-resistant substrate, there is no particular reason a prepared association should be harder to unlearn once a patient is actually engaged in structured extinction; it need only have…
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
Open the illustrated variables: a letter stands for a value guide →
See this notation across published equations →
Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.