Currently, I have it so that a random location within bounds is chosen at the beginning of the experiment:

```
tlower_bound_x = (- 0.075);
tupper_bound_x = 0.075;
tlower_bound_y = 0.25;
tupper_bound_y = 0.35;
target_x = ((Math.random() * (tupper_bound_x - tlower_bound_x)) + tlower_bound_x);
target_y = ((Math.random() * (tupper_bound_y - tlower_bound_y)) + tlower_bound_y);
```

However, now, I’d like it so that this location changes every n trials. Thoughts on how to approach this?