Sequence representation as an early step in the evolution of language
Fig 4
Summary of representation strategies.
This illustrates how an input sequence (A, B) is represented differently by four strategies, and thus generates different representations on which each respective decision on response is based. The Trace strategy represents B and also a trace of A that has faded in intensity from 1 to 0.5 according to the decay rate θ = 0.5. The Depth-1 strategy only represents B at the time of decision. The Depth-2 and Flexible Sequence strategies represent A and B with full strengths and their order, at the time of decision. The Depth-2establishes a unique representation of the full sequence (A, B). The Flexible Sequence strategy establishes the same representation of the sequence (A, B) but also represents sub-sequences, here the single stimuli, thus enabling decision making based on any of these representations.