The dependence of <i>R</i> on <i>g</i>₁ and <i>g</i>₂ at different <i>τ</i> values.

<p><math><mrow><msubsup><mi>P</mi><mi>l</mi><mi>k</mi></msubsup></mrow></math> (<i>l</i> = 4, 5 or 6, <i>k</i> = 4, 5 or 6) and <math><mrow><msubsup><mi>P</mi><mrow><mi>q</mi><mi>c</mi></mrow><mi>k</mi></msubsup></mrow></math> (<i>k</i> = 6 or 7, “c” represents “b” or “e”) represent synchronous bursting patterns. (a) <i>τ</i> = 0 s; (b) <i>τ</i> = 0.65 s; (c) <i>τ</i> = 0.83 s; (d) <i>τ</i> = 2.3 s; (e) <i>τ</i> = 1.45 s; (f) Enlargement of (e).