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Basic Bits of Neuronal Grammar Friedemann Pulvermüller MRC Cognition and Brain Sciences Unit...
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Transcript of Basic Bits of Neuronal Grammar Friedemann Pulvermüller MRC Cognition and Brain Sciences Unit...
Basic Bits of Neuronal Grammar
Friedemann Pulvermüller
MRC Cognition and Brain Sciences Unit Cambridge
Activity states:
• Ignition -- full activation, momentary
• Reverberation -- continuous enhanced activity following ignition
• Priming -- “parasitic” activity caused by strongly connected sets
• Rest -- inactivity
Activity states:
• Darker colours denote reduced activity states
The network:
The represented elements: WORDS
SEQUENCE FEATURES
The representing elements:WORD WEBS
The representing elements:WORD WEBS
SEQUENCE DETECTORS (SDs)
I
3 word inputcongruent with thenetwork structure
The sentence“Betty get up”
will appear in the inputand will not be accepted
by the network
Time step / Input / Process
0 -- All webs at rest
1 Betty Ignition of word web
2 -- Priming of SD
3 -- Priming of SD
4 -- Priming of word web
5 gets Primed ignition ofword web
6 -- Priming of SDsBackward ignition
7 -- Priming of SDsBackward ignition
8 -- Priming of word webBackward ignition
9 -- --
10 up Ignition of word web
11 -- Backward ignition
12 -- Backward ignition
13 -- Backward ignition
14 -- Backward ignition
15 -- Backward ignition
16 -- Backward ignition
17 -- Backward ignition
18 -- Deactivation
At time step 17, the 3 criteria for string acceptance were met:
• All activated word webs were visible (i.e., reverberated at the highest reverberation level).
• All activate word webs were satisfied (i.e., their set of sequence detectors reverberated at a high level).
• All active sets were synchronized (I.e., participated in a continuous wave of ignitions).
II
3 word inputincongruent with the
network structure
The sentence“Up get Betty”
will appear in the inputand will not be accepted
by the network
Time step / Input / Process
0 -- All webs at rest
1 up Ignition of word web
2 -- --
3 -- --
4 get Unprimed ignition I^of word web
5 -- Priming of SDThreshold regulation
6 -- Priming of SD
7 -- Priming of SD
8 Betty Unprimed ignition I^of word web
9 -- Priming of SDThreshold regulation
10 -- Priming of SD
11 -- Priming of SD
At time step 10, the 3 criteria for string acceptance were not met:
• Only 1 word web was visible (the 2 others were at lower activity levels, R2 and R3; cf. darker colours).
• No one of the 3 word webs was satisfied (SDs did not reverberate).
• No final synchronization process.
III
3 word input partly incongruent with the
network structure
The sentence“Up Betty get”
will appear in the inputand will not be accepted
by the network
Time step / Input / Process
0 -- All webs at rest
1 up Ignition of word web
2 -- --
3 -- --
4 Betty Unprimed ignition I^of word web
5 -- Priming of SDThreshold regulation
6 Betty Priming of SD
7 -- Priming of word web
8 get Primed ignition ofword web
9 -- Priming of SDBackward ignition
10 -- Priming of SDBackward ignition
11 -- Backward ignition
12 -- --
At time step 12, not all of the 3 string acceptance criteria were met:
• 2 out of the 3 activated word webs were visible (i.e., reverberated at the highest reverberation level).
• Only 1 out of 3 word webs were satisfied (i.e., their set of sequence detectors reverberated at a high level).
• Only 2 out of the 3 word webs were synchronized (I.e., participated in a continuous wave of ignitions).