Concentration-Invariant Odor Representation in the Olfactory System by Presynaptic Inhibition

Figure 2

The ORN-PN response curve is modulated by the total activity of ORNs. In the low and high baseline cases, the firing rates of other ORNs are set to be 20 Hz and 30 Hz, respectively. Symbols denote the simulation results. The parameters are 𝑁^𝐸=49; 𝐾=40; 𝑁^𝐼=20; 𝑤^𝐸𝐸=10 nS; 𝑤^𝐸𝐼=0.05 nS; 𝑤^𝐼_𝑖=0.1 nS; 𝜏_𝐷=100 ms; 𝜏_𝐸=5 ms; 𝜏_𝐼=100 ms; 𝐶^𝐸=800 pF; 𝐶^𝐼=800 pF; 𝑔_𝐿=25 nS; 𝐸_𝐿=−70 mV; 𝐸_𝐸=0 mV; 𝑣_th=−50 mV; 𝑣_reset=−70 mV; 𝑎=0.3; 𝛼^𝐼=3.76; 𝛽=5.65; 𝑏=𝑎𝑁^𝐼𝛼^𝐼𝛽𝜏_𝐼𝑤^𝐼.