Average firing frequencies (Hz) during the baseline and delay periods, and the frequency difference between baseline and the average of the delay period (delta), for the units exhibiting each of the pattern types by the 2- and 4-population spiking models.

Pattern numbers correspond to the following patterns: 1) Response-coupled ramping cell, 2) fixed rate memory cell, 3) cue-coupled (decaying) memory cell, 4) response-coupled ramping cell with no frequency difference between baseline and period D1, 5) Nonresponsive cells, 6) Decaying inhibition cells with no frequency difference between baseline and period D1, 7) decaying inhibited cells, 8) fixed rate delay inhibited cells, and 9) ramping inhibited cells. The approximate averages for each of these pattern types in the real parietal and prefrontal cell database, as determined in [5] are also indicated. Note the frequencies exhibited by the models are similar to those observed in the real cortical cells.