These general orientation tests for a norm and its pathological variation were the basis upon which I proceeded on broader lines with a further and more exhaustive investigation with the following points in view:
To what extent is visualization weak?
Is it weaker in the worst cases?
Is it less and less weak as cases appear less severe?
Is it the same for past, present and future memories?
Is visualization equally at fault in all sensory areas of the cortex?
Do cases approach normal visualization processes in proportion as they progress in their cure? and
Lastly, numerous other minor queries presented themselves.
All these questions were answered in the following research, which after thus much orientation found a more complete and final form.
In order to answer these questions I formulated the following series of tests to the number of twenty-four in all, and asked them in series to nineteen stutterers, making almost four hundred tests: