Which of the following is not an example of fixed interval schedule of reinforcement ?

Question

Accepted Answer

Option 2, "Dialing a busy number," is NOT an example of a fixed interval schedule of reinforcement because the reinforcement (getting through to the number) is not dependent on a fixed amount of time passing. Instead, it's dependent on the *behavior* of repeatedly dialing and the *unpredictable* event of the line becoming free. There's no set time interval after which you are guaranteed to get through. You might get through on the very next dial, or it might take many attempts over a long, variable period.

Here's why the other options *are* examples of fixed interval schedules:

*   **Option 1: Getting salary every month:** This is a classic example. The reinforcement (salary) is delivered after a fixed interval of time (one month). The employee's behavior (working) is reinforced on a predictable, monthly basis.

*   **Option 3: Having periodic dental checkups:** While the *behavior* of going to the dentist might be reinforced by the feeling of clean teeth or the avoidance of future problems, the *schedule* is fixed interval. You are reinforced (e.g., by a clean bill of dental health, or simply the relief of knowing everything is okay) after a fixed interval of time (e.g., every six months).

*   **Option 4: Getting increment every year:** Similar to getting a salary, an increment is a reinforcement (increased pay) that is delivered after a fixed interval of time (one year). The employee's performance over the year is being reinforced on a predictable, annual basis.

Therefore, only Option 2, "Dialing a busy number," does not fit the definition of a fixed interval schedule of reinforcement. The reinforcement is not tied to a fixed time interval.