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Bilge Sayim

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Related publications (23)

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Gestalt determines contextual modulation

Michael Herzog, Bilge Sayim, Mauro Manassi

Performance deteriorates when a target is flanked by contextual elements. For example, vernier thresholds increase when the vernier is flanked by lines. But when the lines are made part of a “good Gestalt”, like a rectangle, deterioration is reduced. Our e ...

2010

Gestalt Factors Modulate Basic Spatial Vision

Michael Herzog, Bilge Sayim

Human perception of a stimulus varies depending on the context in which the stimulus is presented. Such contextual modulation has often been explained by two basic neural mechanisms: lateral inhibition and spatial pooling. In the present study, we presente ...

2010

Grouping and Gestalt in Visual Contextual Modulation

Bilge Sayim

The perception of a visual stimulus is strongly modulated by surrounding elements. This phenomenon, called contextual modulation, can be exemplary observed in a large number of visual illusions, e.g. in the tilt-illusion where a vertical grating appears ti ...

EPFL2010

Display probability modulates attentional capture by onset distractors

Michael Herzog, Bilge Sayim

Attention can be stimulus-driven and bottom-up or goal-driven and top-down. Bottom-up attention and, particularly, attentional capture are often thought to be strongly automatic, i.e., not modulable. For example, in visual search, it has been shown that sa ...

Association for Research in Vision and Ophthalmology2010

In contextual modulation, bigger is not better for low luminance stimuli

Michael Herzog, Bilge Sayim, Mauro Manassi

Performance on a target can be modified by contextual elements. For example, thresholds strongly increase when a vernier is flanked by two lines. Increasing the number of flankers reduces contextual interference when the flankers are shorter or longer than ...

2010

Global stimulus configuration modulates crowding

Michael Herzog, Bilge Sayim, Toni Saarela

In crowding, neighboring elements impair the perception of a peripherally presented target. Crowding is often regarded to be a consequence of spatial pooling of information that leads to the perception of textural wholes. We studied the effects of stimulus ...

Association for Research in Vision and Ophthalmology2009

Contextual Modulation and Gestalt

Michael Herzog, Bilge Sayim

The perception of a stimulus can strongly be modified by its spatial context. For example, when a vernier stimulus is flanked by two lines, performance deteriorates compared to a vernier without flanks. This is usually explained by local interactions, such ...

2009

Modulation of Attentional Capture by Display Probabilities in Visual Search

Michael Herzog, Bilge Sayim

Attentional capture is often thought to be automatic and not modulable. For example, visual search experiments showed that salient distractor singletons strongly capture attention even when they had to be ignored by the observers. Recently, however, it was ...

2009

Crowding is modulated by global stimulus configuration

Michael Herzog, Bilge Sayim, Toni Saarela

In crowding, neighbouring elements impair the perception of a target. Crowding is often considered a consequence of spatial pooling of visual information. We investigated the role of configural effects in crowding by manipulating the global stimulus config ...

2008

Grouping explains contextual modulation in low level vision

Michael Herzog, Bilge Sayim

Performance on a target can be modified by contextual elements. For example, when a Vernier is flanked by two lines, offset discrimination deteriorates compared to an unflanked presentation. This contextual modulation is usually explained by local spatial ...

2008