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The first answer discusses what the pseudothreshold is and how to find it, but I will try to give a few details on the difference between thresholds and pseudothresholds, since your first question does ask for both definitions. In quantum error correction (QEC), a logical qubit is encoded in many physical qubits. Given some underlying physical error rate $p$...

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So the general definition of pseudothreshold is when the logical qubit outperforms a physical qubit. If your error model is idling error, for example, you want to find the physical value of T1 and T2 for which the physical qubits lifetime is lower than the logical qubit's lifetime. The easiest way to calculate this would be to write a simulation of the ...

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