Fiser J. (2013) B10: Bayesian methods and generative models. ECVP 2013, Perception 42, 4-5 [Abstract]
In the last two decades, a quiet revolution took place in vision research, in which Bayesian methods replaced the once-dominant signal detection framework as the most suitable approach to modeling visual perception and learning. This tutorial will review the most important aspects of this new framework from the point of view of vision scientists. We […]
Fiser J., Koblinger Á. & Arató J. (2019) Reliability-based arbitration between noise and event-based component of observers’ internal model during perceptual decision making. VSS 2019, Journal of Vision 19 (10), 59c-59c [Abstract]
The effects of long-term history on sequentially performed perceptual decision making are typically investigated either under the simplest stationary condition or in the context of changing volatility of the event statistics defined by the generative process. We investigated the rules of human decision making in the more natural situation when changes in the external conditions […]
Arato J. & Fiser J. (2016) Spatio-temporal probability integration during visual discrimination.ECVP 2016, Perception 45, 178-179 [Abstract]
How specific statistical priors do we maintain? While it is known that past stimulus statistics influences later perceptual decisions, it is unclear how such effects would interact and influence decisions across different spatial locations. To test this, we used a visual discrimination paradigm with two target locations, and two abstract shapes that could appear in […]
Fiser J. (2015) Factors that influence judging and guessing about probabilistic event sequences. SFX 2015, Pisa, Italy [Abstract]
Previous studies have reported several factors, including prior knowledge, past experience, immediately preceding events, and rate of event repetitions that influence humans’ ability to predict and perceive sequentially occurring probabilistic events. However, many of these factors are correlated and most earlier studies made little effort to disentangle their confounding effects. I will present a series […]
Fiser J., Popovic M., Haefner RM. & Lengyel M. (2013) Time and making perceptual decisions. ECVP 2013, Perception 42, 237-237 [Abstract]
In models of perceptual decision making within the classical signal processing framework (e.g. integration-to-bound), time is used to accumulate evidence. In probabilistic, sampling-based frameworks, time is necessary to collect samples from subjective posterior distributions for the decision. Which role is dominant during perceptual decisions? We have analytically derived the progression of the error and subjective […]
Garber, D., & Fiser , J. (2022) The effect of emerging structural representation on spatial visual statistical learning Journal of Vision 22 (14), 3514-3514 [Abstract]
Studies of spatial visual statistical learning (SVSL) typically focus on the implicit acquisition of co-occurrence-based element chunks oversimplifying the complex process of structure-based visual learning. We investigated the rules of SVSL under complex visual stimulus and task structures. In Phase 1 of the experiment (N=227), observers were exposed to scenes composed of either only horizontally […]
Szabó B. T., Avarguès-Weber A., Orbán G., Finke V., Nagy M., Dyer A. & Fiser J. (2019) Increasingly complex internal visual representations in honeybees, human infants and adults. VSS 2019, Journal of Vision 19 (10), 292c-292c [Abstract].
Although some animals such as honeybees (Apis mellifera) are excellent visual learners, little is known about their spontaneously emerging internal representations of the visual environment. We investigated whether learning mechanisms and resulting internal representations are similar across different species by using the same modified visual statistical learning paradigm in honeybees and humans. Observers performed an […]
Fiser J., Christensen J. & Bex P. (2016) Encoding basic visual attributes of naturalistic complex stimuli. ECVP 2016, Perception 45, 340-340 [Abstract]
Despite numerous studies with simple stimuli, little is known about how low-level feature information of complex images is represented. We examined sensitivity to the orientation and position of Gabor patches constituting stimuli from three classes according to their image type:Familiar natural objects, Unfamiliar fractal patterns, and Simple circular patterns. All images were generated by re-synthesizing […]
Fiser J. & White BL. (2014) Learning-based cross-modal suppression of ongoing activity in primary cortical areas of the awake rat. COSYNE 2014, Salt Lake City, UT [Abstract]
Ongoing activity is ubiquitous in the cortex and recently has been implied to play a significant functional role in shaping sensory-evoked responses by reflecting the momentary internal state of the brain together with its knowledge about the external world (Berkes et al., Science 2011). A wide variety of studies also reported that ongoing neural signal […]
Fiser J., Savin C., Berkes P., Chiu C. & Lengyel M. (2013) Experience-based development of internal probabilistic representations in the primary visual cortex. VSS 2013, Journal of Vision 13 (9), 600-600 [Abstract]
The developmental increase in similarity between spontaneous (SA) and average stimulus-evoked activity (EA) in the primary visual cortex has been suggested to reflect a progressive adaptation of the animal’s internal model to the statistics of the environment, a hallmark of probabilistic computation in the cortex (Berkes et al, 2011). Still, this gradual adaptation could be […]