DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Percept Choice Dynamics of Stochastic Self-Oscillator Model Dominates Percept Reversal Rate Characteristics under Periodically Interrupted Ambiguous Stimulus

Fürstenau, Norbert (2012) Percept Choice Dynamics of Stochastic Self-Oscillator Model Dominates Percept Reversal Rate Characteristics under Periodically Interrupted Ambiguous Stimulus. In: Proceedings KogWis 2012. Univ. Bamberg. 11th biannual meeting of German Cognitive Science Society KogWis 2012, 30.9. - 3.10. 2012, Bamberg, Deutschland.

[img] PDF - Only accessible within DLR


A stochastic nonlinear dynamics model is presented which explains published experimental results with periodically interrupted ambiguous stimulus [1][2]. The model is related to the synergetic order parameter approach of Ditzinger & Haken [4] and was recently used for explaining long range correlations of the percept reversal time series [3]. Delayed perception state feedback via an attention control parameter (adaptive gain) is used, which in turn is modulated through a slowly varying bias (memory). A mapping of the perception, attention, memory (PAM) equations to basic Thalamo-Cortical reentrant loops was suggested. Experiments with the Necker cube with stimulus-off times toff < 1 s exhibit a maximum of the percept reversal rate of Rmax ca 36 min-1 at toff ca 200 ms (with on-time = 300 ms) [1][2]. According to [1] for toff > 200 ms the percept is stabilized with increasing toff due to recovery from neural fatigue. Within the present model the percept choice or stimulus-onset dynamics during the ambiguous stimulus off-on switching turns out to dominate over fatigue with increasing toff in agreement with Noest et al.[5]. This onset dynamics is induced by the off-on switching of the stimulus ambiguity parameter which correspondingly modulates the feedback. Onset-bifurcation of the perception state at the critical ambiguity parameter value (percept choice) adds to the phase oscillator self-oscillations and to the effects of stochastic attention noise (a fluctuating Langevin force). Numerical simulations are based on the dynamical coupling of the behavioral PAM-variables with delayed feedback. The toff-value at Rmax and the absolute reversal rate values are determined by the time constants (fatigue, recovery, feedback delay = 40 ms) and by the attention noise power as parameters of the nonlinear PAM-state space equations. A linear approximation in the form of a second order Langevin equation allows for an analytic estimate of the percept reversal rate (Rmax = 30 – 40 min-1) and of the perceptual damping time constant (tauv ≈ 1 s). Within a thermodynamic equilibrium approximation the Fluctuation-Dissipation theorem (or Einstein diffusion coefficient of Brownian motion) relates the noise power spectral density and damping to an index of cognitive inertia and a cognitive perceptual energy value of at least 16 orders of magnitude above the thermal noise level at body temperature.

Item URL in elib:https://elib.dlr.de/85930/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Begutachtung: Abstract, 2 anonyme Gutachten mit Zusendung des Ergebnisses Full paper zum Thema zur Begutachtung bei Biological Cybernetics eingereicht
Title:Percept Choice Dynamics of Stochastic Self-Oscillator Model Dominates Percept Reversal Rate Characteristics under Periodically Interrupted Ambiguous Stimulus
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:September 2012
Journal or Publication Title:Proceedings KogWis 2012
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
EditorsEmailEditor's ORCID iDORCID Put Code
Carbon, Claus-ChristianUniv BambergUNSPECIFIEDUNSPECIFIED
Schlieder, ChristophUniv. BambergUNSPECIFIEDUNSPECIFIED
Publisher:Univ. Bamberg
Keywords:cognitive bistability, interrupted stimulus, dynamical model, reversal rate characteristics, linear approximation, fluctuation-dissipation theorem
Event Title:11th biannual meeting of German Cognitive Science Society KogWis 2012
Event Location:Bamberg, Deutschland
Event Type:international Conference
Event Dates:30.9. - 3.10. 2012
Organizer:Gesellschaft für Kognitionswissenschaften
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation (old)
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Human Factors and Safety in Aeronautics (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Guidance > Systemergonomy
Deposited By: Fürstenau, Dr.phil.nat. Norbert
Deposited On:28 Nov 2013 15:07
Last Modified:08 May 2014 23:26

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.