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Dynamics of perceptual instabilities with or without action. Potential application to mental disease| old_uid | 13266 |
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| title | Dynamics of perceptual instabilities with or without action. Potential application to mental disease |
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| start_date | 2014/01/16 |
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| schedule | 10h30-12h |
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| online | no |
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| location_info | EuroMov, salle EJM |
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| summary | The environment always affords many more possibilities for action than one could possibly engage in. How does an animal become attuned to one property of the environment and then switch to another one when the circumstances begin to change? We entertained the possibility that in some circumstances an instability could be induced by breaking the loop of perceiving and acting. In one pair of experiments we find that diminishing the availability of action is responsible for shifting the transition point in an affordance boundary paradigm. A dynamical model is proposed to account for the transitions and for the shifting of these transitions. In the second pair of experiments, we find that the same model helps explain a classical phenomenon in vision science. The spontaneous switches between modes of perception observed with certain types of displays have the character of an instability. Under the conditions of constant environment deprived of possibilities for action the perceptual system enters a dynamical regime with no stable solution but only transiently stable alternating attractors. The significance of the rarely observed phenomenon of negative hysteresis is discussed. Finally, the potential application of this work to understanding certain mental disorders is entertained. |
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| responsibles | Hoffmann, Marin |
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