function nBL = normalBaseLevels( encounters, d, observations )

% This function calculates for all values in the array observations the ACT-R 
% activation base-level as specified in formula 4.1.
%
% encounters: array filled with references to the current chunk, (5 represents reference 
% to chunk 5 seconds ago).
% d: decay rate: 0.5
% observations: an array filled with number of seconds since "now" for which to calculate the
% base-level.

nBL = zeros(1,length(observations));
for i = 1:length(observations)
   lags = encounters + observations(i);
   nBL(i) = baselevelLearningEquation(lags,d);
end