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nROUSE Huber
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Title: nROUSE Huber
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nROUSEHuber OReilly 2003 Ellen Lau
PSYC 709
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Cognitive problem that nROUSE focuses on
- How does brain avoid source confusion when
parsing a continuous stream of stimuli?
Accomodation Synaptic depression
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AccomodationNecker cube
Unamb View 1 (long) Amb Perception View 2
Unamb View 1 (short) Amb Perception View 1
- Long, Toppino, Mondin 1992
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Accomodationsemantic satiation
should NOT diminish semantic priming effect
diminishes semantic priming effect
- spy spy spy spy spy spy spy spy spy spy spy spy
spy spy spy spy spy spy spy spy spy
spy
bug
BEETLE
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Accomodation2-alt forced choice task
long prime less facilitation or inihibition
effect
Short prime facilitation effect
- Huber et al 2001
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ROUSE ? nROUSEmodeling issues
- ROUSE captured the pattern of data from Huber et
al 2001, so why not leave it?
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Synaptic depression
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ROUSE ? nROUSE
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nROUSE
- point neuron model
- model v with membrane potential update equation
- assume different levels w/ different integration
rates - Use lateral inhibition / attractor dynamics to
get system to settle into a stable state - Parameterize noise
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nROUSEmodeling decisions
- Use simplified localist representation of
distributed network for manageability - Choice responding modeled with a horse-race
decision rule - Through simulation, we found that a horse-race
decision rule...provides a good indication of
residual target activation, whereas other logical
alternatives do not. - Point out neurophysiologically-supported
possible solutions for handling noise
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nROUSEmodeling parameters
- Fixed parameters inhibition, feedback,
threshold, leak - Free parameters rate of integration for three
levels, rate of depletion, recovery, and noise
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nROUSEmodeling resultsRepetition priming with
a single prime
- Testing
- core nROUSE proposal of accomodation through
synaptic depression - Assumption of varying levels with varying
integration rates
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nROUSEmodeling resultsRepetition priming with
two primes
- Testing
- perceptual effects not due to simple biasing
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nROUSEmodeling resultsAssociative priming with
a single prime
- Testing
- motivation for having feedback between
orthographic and lexical-semantic levels
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nROUSE ROUSEmodel comparison - discussion
- Because nROUSE is a dynamic model in which
processing is directly related to the sequence of
events, it makes specific predictions as a
function of stimulus duration. In contrast,
different free parameters are necessary for
different durations in the original ROUSE model.
Therefore, nROUSE requires fewer parameters to
handle a range of prime durations, although this
reduction comes at the cost of increased
complexity
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