Figure 12.

Stable fixed points and local minimal values of potential functions. (A) If two stable fixed points exist, the larger value of stable fixed points denoted by ρ₊ corresponds to the LTP is illustrated. Stable fixed-point values (ρ₊) in (a) and local minimal values [V(ρ₊)] of potential functions (Equation 4) in (b) are illustrated under each drug condition. (B) Similarly, the stable fixed point denoted by ρ = α corresponds to the LTD is illustrated. Stable fixed-point values (α) in (a) and local minimal values [V(α)] of potential functions in (b) are illustrated under each drug condition. * and ** represent p < 0.05 and p < 0.01, respectively.