To see the hierarchy in this mechanism, consider that by perceiving just a few letters, you can predict the word; by looking at a few words, you can predict what the sentence means, or even the paragraph.
Para entender la jerarquía en este mecanismo, pensemos en que, al ver aparecer unas pocas letras, podemos predecir la palabra; al mirar unas pocas palabras, podemos predecir el significado de la oración o incluso del párrafo.