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Basic Bits of Neuronal Grammar Friedemann Pulvermüller MRC Cognition and Brain Sciences Unit Cambridge
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Activity states: Ignition -- full activation, momentary Reverberation -- continuous enhanced activity following ignition Priming -- “parasitic” activity caused by strongly connected sets Rest -- inactivity
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Activity states: Darker colours denote reduced activity states
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The network:
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The represented elements: WORDS SEQUENCE FEATURES
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The representing elements: WORD WEBS
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The representing elements: WORD WEBS SEQUENCE DETECTORS (SDs)
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I 3 word input congruent with the network structure
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The sentence “Betty get up” will appear in the input and will not be accepted by the network
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Time step / Input / Process
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0--All webs at rest
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1BettyIgnition of word web
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2--Priming of SD
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3--Priming of SD
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4--Priming of word web
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5getsPrimed ignition of word web
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6--Priming of SDs Backward ignition
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7--Priming of SDs Backward ignition
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8--Priming of word web Backward ignition
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9----
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10upIgnition of word web
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11--Backward ignition
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12--Backward ignition
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13--Backward ignition
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14--Backward ignition
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15--Backward ignition
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16--Backward ignition
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17--Backward ignition
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18--Deactivation
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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).
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II 3 word input incongruent with the network structure
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The sentence “Up get Betty” will appear in the input and will not be accepted by the network
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Time step / Input / Process
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0--All webs at rest
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1upIgnition of word web
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2----
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3----
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4getUnprimed ignition I^ of word web
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5-- Priming of SD Threshold regulation
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6--Priming of SD
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7--Priming of SD
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8BettyUnprimed ignition I^ of word web
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9--Priming of SD Threshold regulation
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10--Priming of SD
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11--Priming of SD
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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.
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III 3 word input partly incongruent with the network structure
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The sentence “Up Betty get” will appear in the input and will not be accepted by the network
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Time step / Input / Process
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0--All webs at rest
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1upIgnition of word web
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2----
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3----
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4BettyUnprimed ignition I^ of word web
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5--Priming of SD Threshold regulation
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6BettyPriming of SD
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7--Priming of word web
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8getPrimed ignition of word web
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9--Priming of SD Backward ignition
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10--Priming of SD Backward ignition
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11--Backward ignition
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12----
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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).
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