scholarly journals Learning and inference using complex generative models in a spatial localization task

2016 ◽  
Vol 16 (5) ◽  
pp. 9 ◽  
Author(s):  
Vikranth R. Bejjanki ◽  
David C. Knill ◽  
Richard N. Aslin
Keyword(s):  
Spatial Localization ◽  
Generative Models ◽  
Localization Task

scholarly journals Learning and optimal inference in a novel spatial localization task

2013 ◽  
Vol 13 (9) ◽  
pp. 746-746
Author(s):  
V. R. Bejjanki ◽  
D. C. Knill ◽  
R. N. Aslin
Keyword(s):  
Spatial Localization ◽  
Localization Task

scholarly journals Induction of Kanizsa contours requires awareness of the inducing context

2016 ◽  
Author(s):  
Theodora Banica ◽  
Dietrich Samuel Schwarzkopf
Keyword(s):  
Human Visual System ◽  
Illusory Contour ◽  
Visual Masking ◽  
Spatial Localization ◽  
Localization Task ◽  
Illusory Contours ◽  
Perceptual Integration ◽  
Complex Scenes ◽  
Recurrent Process ◽  
Rule Out

AbstractIt remains unknown to what extent the human visual system interprets information about complex scenes without conscious analysis. Here we used visual masking techniques to assess whether illusory contours (Kanizsa shapes) are perceived when the inducing context creating this illusion does not reach awareness. In the first experiment we tested perception directly by having participants discriminate the orientation of an illusory contour. In the second experiment, we exploited the fact that the presence of an illusory contour enhances performance on a spatial localization task. Moreover, in the latter experiment we also used a different masking method to rule out the effect of stimulus duration. Our results suggest that participants do not perceive illusory contours when they are unaware of the inducing context. This is consistent with theories of a multistage, recurrent process of perceptual integration. Our findings thus challenge some reports, including those from neurophysiological experiments in anaesthetized animals. Furthermore, we discuss the importance to test the presence of the phenomenal percept directly with appropriate methods.

scholarly journals Prior expectation of objects in space is dependent on the direction of gaze

2018 ◽  
Author(s):  
Brian Odegaard ◽  
Ulrik Beierholm ◽  
Jason Carpenter ◽  
ladan shams
Keyword(s):  
Bayesian Inference ◽  
Spatial Localization ◽  
Frame Of Reference ◽  
Localization Task ◽  
Fixation Position ◽  
Prior Expectation ◽  
Sensory Encoding

Many studies of multisensory spatial localization have shown that observers' responses are well-characterized by Bayesian inference, as localization judgments are influenced not only by the reliability of sensory encoding, but expectations about where things occur in space. Here, we investigate the frame of reference for the prior expectation of objects in space. Using an audiovisual localization task, we systematically manipulate fixation position and evaluate whether this prior is encoded in an eye-centered, head-centered, or hybrid frame of reference. Results show that in a majority of participants, this prior is encoded in an eye-centered frame of reference.

scholarly journals Bayesian transfer in a complex spatial localization task

2020 ◽  
Vol 20 (6) ◽  
pp. 17 ◽  
Author(s):  
Reneta K. Kiryakova ◽  
Stacey Aston ◽  
Ulrik R. Beierholm ◽  
Marko Nardini
Keyword(s):  
Spatial Localization ◽  
Localization Task

Effect of defining features on inhibition in a spatial localization task.

1998 ◽  
Vol 24 (3) ◽  
pp. 993-1005 ◽  
Author(s):  
Patricia M. Simone ◽  
Elizabeth A. Carlisle ◽  
Eileen B. McCormick
Keyword(s):  
Spatial Localization ◽  
Localization Task

scholarly journals Recalibrating the body: visuotactile ventriloquism aftereffect

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4504 ◽  
Author(s):  
Majed Samad ◽  
Ladan Shams
Keyword(s):  
Visual Stimulus ◽  
Spatial Localization ◽  
Simultaneous Presentation ◽  
The Body ◽  
Spatial Representations ◽  
Localization Task ◽  
Tactile Stimuli ◽  
Before And After ◽  
Ventriloquism Aftereffect ◽  
Representations Of Space

Visuotactile ventriloquism is a recently reported effect showing that somatotopic tactile representations (namely, representation of location along the surface of one’s arm) can be biased by simultaneous presentation of a visual stimulus in a spatial localization task along the surface of the skin. Here we investigated whether the exposure to discrepancy between tactile and visual stimuli on the skin can induce lasting changes in the somatotopic representations of space. We conducted an experiment investigating this question by asking participants to perform a localization task that included unisensory and bisensory trials, before and after exposure to spatially discrepant visuotactile stimuli. Participants localized brief flashes of light and brief vibrations that were presented along the surface of their forearms, and were presented either individually (unisensory conditions) or were presented simultaneously at the same location or different locations. We then compared the localization of tactile stimuli in unisensory tactile conditions before and after the exposure to discrepant bisensory stimuli. After exposure, participants exhibited a shift in their tactile localizations in the direction of the visual stimulus that was presented during the exposure block. These results demonstrate that the somatotopic spatial representations are capable of rapidly recalibrating after a very brief exposure to visually discrepant stimuli.

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