metrics of combined eye and head gaze shifts in primates.

metrics of combined eye and head gaze shifts in primates. by Parminder Singh Bahra Download PDF EPUB FB2

J Neurophysiol. Dec;56(6) Combined eye-head gaze shifts in the primate. Metrics. Tomlinson RD, Bahra PS. Gaze (eye-in-space) velocity-duration and velocity-amplitude curves were prepared for head-fixed and head-free gaze shifts in the rhesus monkey with an emphasis on large by: II.

Interactions between saccades and the vestibuloocular reflex. Tomlinson RD, Bahra PS. The mechanisms of eye-head coordination were studied in two alert juvenile rhesus monkeys. Animals were trained to follow a target light to obtain a water reward and the combined eye-head gaze shifts in response to target steps with a variably sized Cited by: combined, eye-head gaze shifts that are similar to visually guided gaze shifts of comparable amplitude and direction.

The amplitude of gaze shifts produced by collicular stimulation depends on the site of stimulation and on the parameters of stimulation (frequency, current, and duration of the stimulation train). We studied the characteristics of combined eye-head gaze shifts in human subjects to determine whether they used similar metrics of combined eye and head gaze shifts in primates.

book when looking at visual (V), auditory (A), and combined (V+A) targets located at several target eccentricities along the horizontal meridian. Subjects displayed considerable variability in the combinations of eye and head movement Cited by: Combined eye-head gaze shifts produced by electrical stimulation of the superior colliculus in rhesus monkeys September Journal of Neurophysiology 76(2) Properties of human eye-head gaze shifts in an anti-gaze shift task.

We also compared a variety of metrics for pro- and anti-gaze shifts across each subject (for simplicity, these data are not shown). D.P. MunozHuman eye-head gaze shifts in a distractor task. Reduced threshold for initiation of early head by: 3.

The supplementary eye field (SEF) is a region within medial frontal cortex that integrates complex visuospatial information and controls eye-head gaze shifts. Here, we test if the SEF encodes desired gaze directions in a simple retinal (eye-centered) frame, such as the superior colliculus, or in some other, more complex by: head is unrestrained primates make coordinated eye-head gaze shifts for which movements of the eyes and head both demonstrate robust relationships with gaze amplitude (humans: Guitton and Volle ; Volle and Guittonand monkeys: Freedman and SparksMorasso et al.

Abstract. Most studies of rapid orienting gaze shifts generated by combined eye and head movements have focused on an experimental condition in which gaze displacements are started with the subject's eyes in the normal straight-ahead position in the by: 1. Fixations and gaze points.

When we talk about eye tracking, fixations and gaze points are the basic output measures of interest and often the most used terms. Gaze points show what the eyes are looking at. If your eye tracker collects data with a sampling rate of 60 Hz, you will end up with 60 individual gaze points per second.

Douglas P. Munoz. Human eye-head gaze shifts in a distractor task. Truncated gaze shifts. Neurophysiol. –, This study examines two current ideas regarding the control of eye-head gaze shifts. The first idea stems from recent studies involving elec-trical stimulation in the primate superior colliculus that suggest that a.

A minimum effort rule, employing short duration for the eye and head movements to optimally select the eye and head control signals, was used for the organization of.

Combined eye-head gaze shifts in the primate. III. Contributions to the accuracy of gaze saccades. J Neurophysiol –, ; Tomlinson RD, Bahra PS. Combined eye-head gaze shifts in the primate. Metrics. J Neurophysiol –, a ; Tomlinson RD, Bahra PS. Combined eye-head gaze shifts in the primate. operative eye hypothesis’’ in a simple 2 2 design with the two factors Head (turned or not) and Eyes (open or closed).

This design enabled a direct comparison between the role of head and eyes in the gaze following of humans versus great apes. As an additional probe, we also presented these same. The head-movement component of the gaze shift was modulated by initial head-orientation and sound frequency, but not by eye position.

This demonstrates that eye and head are controlled separately by signals in an eye-centered and head-centered reference frame, respectively.

Introduction Localizing sounds with eye-head gaze shifts requires a. Gaze-related activity of brainstem omnipause neurons during combined eye-head gaze shifts in the alert cat. Exp Brain Res –, Crossref PubMed ISI Google Scholar; Paré M, Guitton D.

Brain stem omnipause neurons and the control of combined eye-head gaze saccades in the alert cat. J Neurophysiol –, Link ISI Cited by: A saccade (/ s ə ˈ k ɑː d / sə-KAHD, French for jerk) is a quick, simultaneous movement of both eyes between two or more phases of fixation in the same direction. In contrast, in smooth pursuit movements, the eyes move smoothly instead of in phenomenon can be associated with a shift in frequency of an emitted signal [clarification needed] or a movement of a body.

Usually the integration of eye and head position is used to compute the location of the gaze in the visual scene. Simple eye trackers report only the direction of the gaze relative to the head (with head-mounted system, electrodes, sceleral coils) or for a fixed position of the eyeball (systems which require a head fixation).

Such eyeCited by:   There are many ganglion cell types and subtypes in our retina that carry color information. These have appeared at different times over the history of the evolution of the vertebrate visual by: Eye-head coordina-extensively studied in a variety of species including humans, tion during head-unrestrained gaze shifts in rhesus monkeys.

rhesus monkeys, and cats (cf. Becker ). Although there Neurophysiol. –, We analyzed gaze shifts are species differences, the saturating function that describesCited by: Publications. Primate Eye is the PSGB's main publication. PSGB has also adopted Folia Primatologica as an official publication of the Society.

Primate Eye. All members receive Primate Eye (ISSN ) three times a year, in electronic or hard copy. Head-unrestrained gaze shifts generated under nor-mal conditions are usually initiated with the eyes nearly centered in the head. The initial eye position in head (IEP h), or the eye position prior to onset of gaze shifts, is known to significantly modulate the eye and head contributions of gaze shifts (Tomlinson, ; Delreux.

To measure shifts in gaze and visual attention, the researchers used sophisticated eye tracking equipment to capture the precise timing of eye movements. The infants sat on their parent’s laps and watched images appear on a computer monitor.

The test procedure used in the study is known as the gap/overlap task. A Comparative Exploration of Eye Gaze and Head Motion Cues for Lane Change Intent Prediction Anup Doshi and Mohan Trivedi Abstract„Driver behavioral cues may present a rich source of information and feedback for future Intelligent Driver Assis-tance Systems (IDAS).

Two of the most useful cues might be eye gaze and head motion. Gaze-related activity of brainstem omnipause neurons during combined eye-head gaze shifts in the alert cat M.

Par~ and D. Guitton Montreal Neurological Institute and Department of Neurology and Neurosurgery, McGill University, University, Montreal H3A 2B4, Canada Received J / Accepted August 1, Summary.

Introducing a unit of exchange measured by Gaze: A win-win-win for content owners, advertisers and users. Gaze Coin uses the concept of “gaze” to create a business model for VR and AR by creating a unit of exchange between content owners, advertisers and users measured initially by gaze and then, more specifically, through eye tracking.

current literature, i.e., gaze movements produced by coordinated movements of the eyes and head. Most studies of gaze control take a I-D or 2-D approach. From this perspective. certain fundamental findings arise, among them, that gaze shifts generally start with a rapid eye movement (saccade) toward the.

general applications [3,4], problems with the current eye tracking technology prevents such interfaces from reaching the consumer market as a standard input device. Eye gaze trackers (EGTs) can be head mounted or remote. Head mounted EGTs are more accurate and allow for free head motion, but requires the user to wear the device.

ThisFile Size: KB. Gaze shifting & Gaze holding Ocular motor functionsGauri S. Shrestha,FIACLE Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.

If you continue browsing the site, you agree to. There are about extant species of primates, distributed mainly in tropical and subtropical forests of Africa, Madagascar, Asia, many islands of the Malay Archipelago, Central America, and South America. Primates live mainly in trees, but there are semiterrestrial and terrestrial forms.

The animals live in troops or, less frequently, in couples. Current evidence suggests that some non-human primates do in fact acquire gaze-following behaviours over a different developmental time course than humans.

For example, some macaque species appear to develop gaze-following skills at a slower rate than humans [29–31], with responses to some gaze cues (such as eye direction) not emerging until. The size of their eye-in-head movements was smaller when they did not blink compared to when they did blink (F 1,13 = p29, = ; Fig.

When the eye-in-head movement was greater than 15° (n = 42), 76% of gaze shifts were accompanied by blinks. The size of their eye-in-head movements was also smaller after the pred. achieved through head-free gaze shifts (i.e.

coordinated movements of the eyes and head) [1–3]. Gaze shifts can be decomposed into three main movement components: move-ments of the eye-in-space or gaze (Es), movements of the head-in-space (Hs) and movements of the eye-in-head (Eh).

The relationship among these components is represented by. well with eye gaze interaction in demonstrations. The next step is to show that our technique can stand up to more rigorous use and that people are comfortable selecting objects using eye gaze over a more extended period of time.

We compare the performance of eye gaze interaction with that of a widely used, general-purpose device: the mouse. Small but significant shifts of nearpoints toward the eye were observed when head position or eye gaze was shifted from above to below the horizontal, for the younger observers only (the maximum mean difference between conditions was D, compared with a mean accommodation level of D for this young group).Cited by:   Table 1 Temporal visual field angles in primary position of gaze and in eye abduction for the human orbit and non-human ape-like modified orbits.

In primates, the eye scales with greater Cited by: 2. SEF and the motor related neurons responsible for eye and head movements. The timing and metrics of evoked EMG activity and eye-head gaze shifts are consistent with other frontal areas suggesting a functional role of the frontal cortex in influencing eye-head gaze shifts.

Chapter four will combine EMG recordings with SEF stimulation during a pro-Author: Brendan B Chapman. Gaze following is defined as the ability of one individual (X) to follow the direction of gaze of a second individual (Y) to a location in space ().The ability to track visually the gaze direction of conspecifics to targets may have a considerable adaptive advantage, because individuals can gain information about food sources, social status of conspecifics, and the locations of.

Start studying Humans and Other Primates. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Eyes at the front of the head are important for primates because they provide. three-dimensional vision. early type of hominid found in Africa.

australopithecine. Cornell University. (, May 24). Primate Eye Evolution: Small Evolutionary Shifts Make Big Impacts -- Like Developing Night Vision. ScienceDaily.

Retrieved from edaily. Gaze shifting, gaze following, and gaze turn-taking. At about four months, baby's color vision matures as well as the other visual abilities such as depth perception and distance. With that, eye-hand coordination is developing more.

Then baby pays attention to details at about 5 months. Gaze shifting between face and fingerspelling hand.Start studying Brain evolution.

Learn vocabulary, terms, and more with flashcards, games, and other study tools.Evidence-Based Principles for Selecting Eye Gaze AAC Technology Katya Hill, P.h.D., CCC-SLP School of Health and Rehabilitation Sciences Gaze typing compared with input by head and hand.

Paper presented at the ACM Symposium on .