scholarly journals Persistence of Visual Mislocalizations across Eye Movements in a Case of Impaired Visual Location Perception: Implications for Visual Updating and Visual Awareness

2010 ◽  
Vol 10 (7) ◽  
pp. 561-561
Author(s):  
M. McCloskey ◽  
E. Gregory
Keyword(s):  
Eye Movements ◽  
Visual Awareness ◽  
Location Perception

scholarly journals Tachyons but Not Photons Might Generate Conscious Dreams

2019 ◽  
Author(s):  
Ahmad Yousef
Keyword(s):  
Eye Movements ◽  
Visual Information ◽  
Human Subjects ◽  
Visual Awareness ◽  
Human Eye ◽  
Rapid Eye Movements ◽  
Cognitive Vision ◽  
Human Awareness

We had learnt from cognitive vision that involuntarily visual awareness should be generated by exogenous stimuli; but not indigenous! Given the complexity of understanding the reasons behind the rapid eye movements during vivid dreams; dreams that carry highly bizarre information; dreams that disallow the human subjects to have control over what they see; these types of dreams should be therefore reside under the umbrella of the “involuntary human awareness”. We therefore suggest possibilities of physical particles that could carry the visual information of these extraordinary exogenous stimuli; particles that should be able to invade the human’s eyes while they are closed; particles that have the ability to move the eye rapidly aiming for perfect transformation of the visual information. The present research aims to talk about these particles, proposes scenarios of how human eye & retina deal with them.

On Nystagmus, Saccades, and Fixations

Perception ◽  
10.1068/p3395 ◽  
2003 ◽  
Vol 32 (2) ◽  
pp. 167-184 ◽  
Author(s):  
Benjamin W Tatler ◽  
Nicholas J Wade
Keyword(s):  
Eye Movements ◽  
19Th Century ◽  
18Th Century ◽  
Visual Awareness ◽  
Vestibular Stimulation ◽  
Late 18Th Century ◽  
Vestibular Reflex ◽  
Voluntary Eye Movements ◽  
Slow Eye Movements ◽  
The 19Th Century

Investigations of the ways in which the eyes move came to prominence in the 19th century, but techniques for measuring them more precisely emerged in the 20th century. When scanning a scene or text the eyes engage in periods of relative stability (fixations) interspersed with ballistic rotations (saccades). The saccade-and-fixate strategy, associated with voluntary eye movements, was first uncovered in the context of involuntary eye movements following body rotation. This pattern of eye movements is now referred to as nystagmus, and involves periods of slow eye movements, during which objects are visible, and rapid returns, when they are not; it is based on a vestibular reflex which attempts to achieve image stabilisation. Post-rotational nystagmus was reported in the late 18th century (by Wells), with afterimages used as a means of retinal stabilisation to distinguish between movement of the eyes and of the environment. Nystagmus was linked to vestibular stimulation in the 19th century, and Mach, Breuer, and Crum Brown all described its fast and slow phases. Wells and Breuer proposed that there was no visual awareness during the ballistic phase (saccadic suppression). The saccade-and-fixate strategy highlighted by studies of nystagmus was shown to apply to tasks like reading by Dodge, who used more sophisticated photographic techniques to examine oculomotor kinematics. The relationship between eye movements and perception, following earlier intuitions by Wells and Breuer, was explored by Dodge, and has been of fundamental importance in the direction of vision research over the last century.

scholarly journals Intrasaccadic perception triggers pupillary constriction

2015 ◽  
Author(s):  
Sebastiaan Mathôt ◽  
Jean-Baptiste Melmi ◽  
Eric Castet
Keyword(s):  
Eye Movements ◽  
Visual Processing ◽  
Peak Velocity ◽  
Visual Awareness ◽  
Saccadic Eye Movements ◽  
Pupillary Response ◽  
Subjective Report ◽  
Vertical Grating ◽  
Pupillary Constriction ◽  
Eye Velocity

It is commonly believed that vision is impaired during saccadic eye movements. However, here we report that some visual stimuli are clearly visible during saccades, and trigger a constriction of the eye's pupil. Participants viewed sinusoid gratings that changed polarity 150 times per second (every 6.67 ms). At this rate of flicker, the gratings were perceived as homogeneous surfaces while participants fixated. However, the flickering gratings contained ambiguous motion: rightward and leftward motion for vertical gratings; upward and downward motion for horizontal gratings. When participants made a saccade perpendicular to the gratings' orientation (e.g., a leftward saccade for a vertical grating), the eye's peak velocity matched the gratings' motion. As a result, the retinal image was approximately stable for a brief moment during the saccade, and this gave rise to an intrasaccadic percept: A normally invisible stimulus became visible when eye velocity was maximal. Our results confirm and extend previous studies by demonstrating intrasaccadic perception using a reflexive measure (pupillometry) that does not rely on subjective report. Our results further show that intrasaccadic perception affects all stages of visual processing, from the pupillary response to visual awareness.

scholarly journals Intrasaccadic perception triggers pupillary constriction

2015 ◽  
Author(s):  
Sebastiaan Mathôt ◽  
Jean-Baptiste Melmi ◽  
Eric Castet
Keyword(s):  
Eye Movements ◽  
Visual Processing ◽  
Peak Velocity ◽  
Visual Awareness ◽  
Saccadic Eye Movements ◽  
Pupillary Response ◽  
Subjective Report ◽  
Vertical Grating ◽  
Pupillary Constriction ◽  
Eye Velocity

It is commonly believed that vision is impaired during saccadic eye movements. However, here we report that some visual stimuli are clearly visible during saccades, and trigger a constriction of the eye's pupil. Participants viewed sinusoid gratings that changed polarity 150 times per second (every 6.67 ms). At this rate of flicker, the gratings were perceived as homogeneous surfaces while participants fixated. However, the flickering gratings contained ambiguous motion: rightward and leftward motion for vertical gratings; upward and downward motion for horizontal gratings. When participants made a saccade perpendicular to the gratings' orientation (e.g., a leftward saccade for a vertical grating), the eye's peak velocity matched the gratings' motion. As a result, the retinal image was approximately stable for a brief moment during the saccade, and this gave rise to an intrasaccadic percept: A normally invisible stimulus became visible when eye velocity was maximal. Our results confirm and extend previous studies by demonstrating intrasaccadic perception using a reflexive measure (pupillometry) that does not rely on subjective report. Our results further show that intrasaccadic perception affects all stages of visual processing, from the pupillary response to visual awareness.

scholarly journals Melodic sound enhances visual awareness of congruent musical notes, but only if you can read music

2015 ◽  
Vol 112 (27) ◽  
pp. 8493-8498 ◽  
Author(s):  
Minyoung Lee ◽  
Randolph Blake ◽  
Sujin Kim ◽  
Chai-Youn Kim
Keyword(s):  
Eye Movements ◽  
Binocular Rivalry ◽  
Musical Training ◽  
Visual Awareness ◽  
Auditory Information ◽  
Musical Score ◽  
Symbolic Representations ◽  
Symbolic Notation ◽  
High Level ◽  
Audiovisual Interaction

Predictive influences of auditory information on resolution of visual competition were investigated using music, whose visual symbolic notation is familiar only to those with musical training. Results from two experiments using different experimental paradigms revealed that melodic congruence between what is seen and what is heard impacts perceptual dynamics during binocular rivalry. This bisensory interaction was observed only when the musical score was perceptually dominant, not when it was suppressed from awareness, and it was observed only in people who could read music. Results from two ancillary experiments showed that this effect of congruence cannot be explained by differential patterns of eye movements or by differential response sluggishness associated with congruent score/melody combinations. Taken together, these results demonstrate robust audiovisual interaction based on high-level, symbolic representations and its predictive influence on perceptual dynamics during binocular rivalry.

scholarly journals Emotional faces guide the eyes in the absence of awareness

eLife ◽  
2019 ◽  
Vol 8 ◽  
Author(s):  
Petra Vetter ◽  
Stephanie Badde ◽  
Elizabeth A Phelps ◽  
Marisa Carrasco
Keyword(s):  
Eye Movements ◽  
Eye Gaze ◽  
Visual Awareness ◽  
Emotional Information ◽  
Continuous Flash Suppression ◽  
Emotional Faces ◽  
Fearful Faces ◽  
Ability To Act ◽  
Fearful Face ◽  
Emotional Face

The ability to act quickly to a threat is a key skill for survival. Under awareness, threat-related emotional information, such as an angry or fearful face, has not only perceptual advantages but also guides rapid actions such as eye movements. Emotional information that is suppressed from awareness still confers perceptual and attentional benefits. However, it is unknown whether suppressed emotional information can directly guide actions, or whether emotional information has to enter awareness to do so. We suppressed emotional faces from awareness using continuous flash suppression and tracked eye gaze position. Under successful suppression, as indicated by objective and subjective measures, gaze moved towards fearful faces, but away from angry faces. Our findings reveal that: (1) threat-related emotional stimuli can guide eye movements in the absence of visual awareness; (2) threat-related emotional face information guides distinct oculomotor actions depending on the type of threat conveyed by the emotional expression.

The effect of clause wrap-up on eye movements during reading

2000 ◽  
Vol 53 (4) ◽  
pp. 1061-1080 ◽  
Author(s):  
Keith Rayner ◽  
Gretchen Kambe ◽  
Susan A. Duffy
Keyword(s):  
Eye Movements ◽  
Eye Movements During Reading

Editorial: Human motion perception, eye movements, and orientation in visual space

2000 ◽  
Vol 59 (2) ◽  
pp. 85-88 ◽  
Author(s):  
Rudolf Groner ◽  
Marina T. Groner ◽  
Kazuo Koga
Keyword(s):  
Eye Movements ◽  
Motion Perception ◽  
Visual Space ◽  
Human Motion
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