The Schulte Table(Schulte Grid) was developed originally as a psycho-diagnostic test to study the properties of attention, by German psychiatrist and psychotherapist Walter Schulte (1910 — 1972)). From 1962 to 1972 Professor Schulte worked in Tübingen, where he worked in psychopathology and psychotherapy research. Initially, the sample was developed in engineering psychology, it has been used to assess the efficiency and speed of search movements of the vision.
The Schulte Table Generally used 5x5 table, while there are possible variations with different dimensions, coloured cells and values.Focus on the grid centre and find all the numbers (letters) with your peripheral vision, i.e. without moving your eyes.