Short Term Memory May Be the Depletion of the Readily Releasable Pool of Presynaptic Neurotransmitter Vesicles

Figure 6 After 90 seconds the two words 1 lost 70% of the tagging. Probability of finding
either is the current tagging level of 30%.

Figure 7. The display of recall prompt word 1 takes place at 90 seconds after stimulus
presentation. Word 1 is now retagged. Word 2 is not retagged and the probability of finding it is
still 30%.

The tagging level (the probability of correct response) decays equally fast for recognition
and recall (see Figure 8). The tagging level decay with time for the average of the two data sets
calculated from (4) is shown in Figure 9 ((5) did not test memory as a function of time but as a
function of repeated learning so it is not included). It fits a logarithmic curve. The time for the
tagging to decay to 50% is about 14 seconds but because of the logarithmic decay the time to
drop to 20% is much longer - 220 seconds.

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