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LBA model of intertemporal choice. The choice and RT on a given trial depend on which of two accumulators, representing the immediate and delayed options, reaches an accumulation bound (b) first. Trial-to-trial variability in behavior depends on the drift rate (d) and starting point (a) on each accumulator. Trial-specific measures of value accumulation (VAC, VAU) depend on single-trial estimates of drift rates and starting points for the chosen (C) and unchosen (U) options.
