Incremental Learning Demo, page-56

Hi @uiux .
Thank you so much for putting this together and enabling us to have a play.
Am very impressed but am wondering why it seems to struggle somewhat with text?
It very easily distinguishes between say live images of Grass, yellow flower, white flower and buttercup (also yellow) and can easily discern my foot from a croc from a milk bottle from some bamboo.
But when I show it some words, black text on a white background such as couldnt, phenomenal, of, ability, etc it's recognition rate is much degraded. I would have guessed that the spike patterns generated by any particular word would be as unique and recognisable as any other and much more complicated data package of say the image of a buttercup?
Is that maybe the problem.... that not enough data difference from one word to the next?
Sorry in advance if these are dumb questions or a dumb experiment not within the parameters of your demo.
Appreciate any thoughts.
Hop