Symposium (S2): Perceptual Memory and Adaptation: Models, Mechanisms, and BehaviorMonday 26 August 2013, 09:00-11:00, Hanse | |
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| Organizer: C M Schwiedrzik Our perception is constantly shaped by previous experience. This is evident in perceptual after effects such as the tilt after effect, where prolonged viewing of one orientation causes subsequent orientations to be perceived away from the adaptor. Similar effects occur at a neural level, where neurons adapt their firing rates when repeatedly stimulated with the same stimulus. Intriguingly, previous experience does not have unitary effects on perception. In fact, it can bias perception in two completely opposing ways, either exerting an attractive effect, sensitizing the brain to perceive the same stimulus again (perceptual memory or stabilization), or a repulsive effect, biasing the brain to perceive a ‘different’ stimulus (perceptual adaptation). The neural mechanisms underlying both perceptual phenomena and computations are only recently starting to become unraveled. Particular emphasis has been paid to the role of neuronal adaptation, which is thought by many to dynamically optimize neural coding at the single neuron and network level. However, a mechanistic understanding especially of the coexistence of perceptual memory and adaptation is still lacking. Furthermore, it remains unclear whether and how the behavioral effects and underlying mechanisms can be unified within one theoretical framework. This symposium will investigate the relationship between the perceptual and neural after effects of previous experience and discuss their functional role in perception and neural computation. To this end, we will cover recent advances in the understanding of the effects of previous experience in terms of models, mechanisms, and behavior, with a translational approach from single cell recordings in macaque monkeys to fMRI and psychophysics in humans. In particular, the speakers will present different views on the functional role of neuronal adaptation, discuss the different temporal scales and neural underpinnings of previous experience in general and perceptual memory and adaptation in particular, and what happens when their implementation fails in psychiatric disorders. We will conclude by discussing if and how the diverse findings and proposals on the neural and perceptual effects of previous experience can be unified under one theoretical framework, namely as a case of perceptual inference within the predictive coding framework. | |
| 09:00 | Introduction |
| 09:05 | Adaptive coding in visual cortical networks V Dragoi |
| 09:25 | Mechanisms of adaptation in macaque inferior temporal cortex R Vogels |
| 09:45 | History effects in visual perception P Mamassian |
| 10:05 | Perceptual memory in ambiguous vision: A paradigmatic case of perceptual inference P Sterzer |
| 10:25 | Separate cortical networks for perceptual memory and perceptual adaptation C Schwiedrzik |
| 10:45 | Discussion |
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