1. Ch9. Sequence Detection

2. Alternative serial-order mechanism Sequence Detector with Mediator
Summarization
Alternative serial-order mechanism
Sequence Detector with Mediator
Mediator : a third element to both representations of elementary events
Aspects
Movement Detection
For Word Strings
Syntactic Structure

3. Mediator of sequence detection
Movement Detection
Mediator of sequence detection
Movement Detection
A third neuron γ responds to the sequential stimulation of α and β, but not to the reverse sequence.
The mechanism involves low-pass filtering of the signals to delay or stretch
In visual systems of insects , mammals, and cerebellar systems
Extra third-party elements vs. direct sequence (both) A A α γ B B β

4. Sequence Detectors for Word Strings
Mediated sequence detection may be relevant for processing the serial order of words.
Not equal to the visual systems
Time domain differences
Time scale Problem
Number of represented sequences : too many detectors responding to a particular sentence
Categorization : word categories(word webs)
Generalization
α1 β1  α2β2  AB  α2β1
Variable Delays
Peter comes / Peter, the singer, comes / Peter, the world wide famous singer, comes …

5. Sequence Detectors and Syntactic Structure
Tree construction
Within-tree transport of features
Disadvantage in representation
Syntactic Model based on Sequence Detectors
Pronoun-verb
Verb-verb suffix
Pronoun-verb suffix
Syntactic Priming
Ex) double object setence
Sequence Detectors on categories of word representations  Sequences of words from lexical categories He
come s
Ppr V Vs Np Vp S
Lexical
Categories
Syntactic
Categories He
come s
Word webs
Sequence
Detectors

6. Researches on Neural Network
Conclusion
Researches on Neural Network
Single layer
Multi-layers
Direct Sequence Detector vs. Mediated Sequence Detector
Mediated Sequence Detector
A variety of delay range
Mediator