All Outputs (5)

History Effects on Perception of Noisy Stimuli (2019)
Presentation / Conference Contribution
Gekas, N., & Mamassian, P. History Effects on Perception of Noisy Stimuli. Presented at 41st European Conference on Visual Perception (ECVP), Trieste, Italy

Human perception is partially affected by what has been previously experienced. These history effects presumably help tackle current sensory uncertainty by tracking past stimulus statistics. However, there is no definitive framework on how stimulus h... Read More about History Effects on Perception of Noisy Stimuli.

Perceptual effects of adaptation over multiple timescales (2017)
Presentation / Conference Contribution
Gekas, N., McDermott, K., & Mamassian, P. Perceptual effects of adaptation over multiple timescales. Presented at VSS 2017

It is well known that adaptation to a visual stimulus leads to a negative correlation between the current percept and previous percepts. However, there are diverging views on how stimuli further in the past affect the current percept. We have argued... Read More about Perceptual effects of adaptation over multiple timescales.

Speed channel interactions in naturalistic motion stimuli (2016)
Presentation / Conference Contribution
Gekas, N., Meso, A., Masson, G., & Mamassian, P. Speed channel interactions in naturalistic motion stimuli. Presented at VSS 2016

Human observers are very sensitive to speeds of moving stimuli. However little is known about how such sensitivity arises independently upon the spatiotemporal properties of the stimulus. Here, we investigate the interactions between spatiotemporal f... Read More about Speed channel interactions in naturalistic motion stimuli.

Effect of orthogonal adaptation on the perceived velocity of multidirectional random dot stimuli at different speeds (2016)
Presentation / Conference Contribution
Gekas, N., & Mamassian, P. Effect of orthogonal adaptation on the perceived velocity of multidirectional random dot stimuli at different speeds. Presented at 39th European Conference on Visual Perception (ECVP) 2016, Barcelona

Motion adaptation generates strong aftereffects in the opposite direction. Here, we investigated the effect of orthogonal adaptation on perceived velocity across different speeds. Human observers adapted to a broadband grating, moving upwards at 6°/s... Read More about Effect of orthogonal adaptation on the perceived velocity of multidirectional random dot stimuli at different speeds.

Investigating the specificity of experimentally induced expectations in motion perception (2012)
Presentation / Conference Contribution
Gekas, N., Seitz, A., & Seriès, P. Investigating the specificity of experimentally induced expectations in motion perception. Presented at VSS 2012

Our perceptions are fundamentally altered by our expectations, a.k.a. "priors" about the world. In previous statistical learning experiments (Chalk et al, 2010), we investigated how such priors are formed by presenting subjects with low contrast movi... Read More about Investigating the specificity of experimentally induced expectations in motion perception.