Select a good sized picture which is strange to the child, in which
there are several persons surrounded by the furniture of a room, or
any similar setting where there are a number of objects. Allow him
to give one quick glance at the picture and then see whether he can
recall definitely just how many persons were in the picture? Whether
they were men, women or children; and locate definitely the position of
each person. The first glance should not exceed one second. Now let him
look at the picture again for not more than five seconds. See how many
objects he can name, check them up to see that he is accurate. Also
notice how many objects are mentioned which are not in the picture.