Ernest 11.5 simulates different possible sequences of interactions in spatial memory before selecting the best sequence to enact. These simulations are represented in the bottom-right area of the video. Simulations that produce predictable results (due to information available in spatial memory) are represented with orange outlines. Simulations that produce unpredictable results (due to the lack of information in spatial memory) are represented in blue. The video shows that Ernest learns to simulate increasingly elaborated sequences of interactions as time goes on (see blue squares and triangles spreading in all directions around Ernest from step 253 on).
The high value associated with stepping on flowers favors simulations that lead to even more stepping on flowers. As a result, Ernest learns to make a u-turn to return to a flower when he passes one (see Ernest keeping stepping on the flower from step 260 on).
We find this experiment interesting because it illustrates how an inborn drive can give raise to an explicit goal. Ernest's inborn tendency to step on flowers makes Ernest identify flowers as an interesting goal to reach. Once this goal is recognized, Ernest performs a rudimentary problem-solving computation to reach it. Perhaps the skill to choose a desirable point in space and find a sequence of operations to reach this point underlays higher-level problem-solving skills.
Posts
