Information Technology Reference
In-Depth Information
9.2.5.3 The First Brain Imaging Phenomena
As shown in Fig. 9.3, at the beginning of practice, the CE (including DLPFC) and
the BG servers are highly utilized, while the SMA server (including pre-SMA) (3%)
and M1 and two hand servers (15%) are less utilized. After 352
8trialsof
practice, the CE server (DLPFC) decreased its utilization greatly to 0%. Percentage
of utilization of SMA server is increased by 47%. M1 and two hand servers and
S1 also increased their percentage of utilization during the learning process by 85%
and 22%, respectively. These simulation results are consistent with the experimental
results in PET and fMRI studies [23, 40, 17] who found similar patterns of increases
and decreases in brain activity.
,
125
×
Fig. 9.3: Server utilization at the beginning and end of practice in learning to type
multidigit sentence.
9.2.5.4 The Second Brain Imaging Phenomena
After the model finished its learning process, it was able to simulate the second brain
imaging phenomenon of the skilled typist in typing different stimuli. The 1,600
letters to be typed by the model changed following this pattern: 1st
−
800th letters:
repetitive letters; 801st - 1,600 letters: multidigit sentence.
Figure 9.4 shows the percentage of utilization of the major servers in the different
stimulus conditions. When the model is typing repetitive letters, mainly M1 and
two hand servers are utilized. When the stimuli changed from repetitive letters to
multidigit sentences the utilization of SMA, BG, and S1 increased by 49, 90, and
Fig. 9.4: Server utilization when stimuli presented changed in the well-learned tran-
scription typing situation.
