Averaging this neuronal activity across multiple trials revealed a drift-like signal that gradually increased over time to resemble a ramp-like pattern (Figure 1B; Shadlen and Newsome, 2001).
(A) Steinemann et al.
The neuronal activity of the first subgroup resembled the drift-diffusion dynamics observed in previous studies.
Steinemann et al.
This implies that the pattern of neuronal activity that was detected in previous studies does indeed align with the drift-diffusion model.

Decisions: Tracking the evolution of a single choice