scholarly journals The time course of initial scene processing for eye movement guidance in natural scene search

2010 ◽  
Vol 10 (3) ◽  
pp. 1-13 ◽  
Author(s):  
Melissa L.-H. Võ
Keyword(s):  
Eye Movement ◽  
Time Course ◽  
Natural Scene ◽  
Scene Processing

The time-course of morphological constraints

2008 ◽  
Vol 3 (2) ◽  
pp. 149-175 ◽  
Author(s):  
Ian Cunnings ◽  
Harald Clahsen
Keyword(s):  
Eye Movements ◽  
Eye Movement ◽  
Language Processing ◽  
Time Course ◽  
Judgment Task ◽  
General Constraint ◽  
Movement Data ◽  
Word Forms ◽  
Eye Movements During Reading ◽  
Acceptability Judgment

The avoidance of regular but not irregular plurals inside compounds (e.g., *rats eater vs. mice eater) has been one of the most widely studied morphological phenomena in the psycholinguistics literature. To examine whether the constraints that are responsible for this contrast have any general significance beyond compounding, we investigated derived word forms containing regular and irregular plurals in two experiments. Experiment 1 was an offline acceptability judgment task, and Experiment 2 measured eye movements during reading derived words containing regular and irregular plurals and uninflected base nouns. The results from both experiments show that the constraint against regular plurals inside compounds generalizes to derived words. We argue that this constraint cannot be reduced to phonological properties, but is instead morphological in nature. The eye-movement data provide detailed information on the time-course of processing derived word forms indicating that early stages of processing are affected by a general constraint that disallows inflected words from feeding derivational processes, and that the more specific constraint against regular plurals comes in at a subsequent later stage of processing. We argue that these results are consistent with stage-based models of language processing.

Do Alprazolam-Induced Changes in Saccadic Eye Movement and Psychomotor Function Follow the Same Time Course?

1998 ◽  
Vol 38 (4) ◽  
pp. 337-346 ◽  
Author(s):  
Patricia D. Kroboth ◽  
M. Margaret Folan ◽  
Kenneth S. Bauer ◽  
William Tullock ◽  
C. Eugene Wright ◽  
...  
Keyword(s):  
Eye Movement ◽  
Time Course ◽  
Saccadic Eye Movement ◽  
Psychomotor Function ◽  
Induced Changes

scholarly journals The Changing Landscape: High-Level Influences on Eye Movement Guidance in Scenes

Vision ◽  
2019 ◽  
Vol 3 (3) ◽  
pp. 33 ◽  
Author(s):  
Carrick C. Williams ◽  
Monica S. Castelhano
Keyword(s):  
Eye Movements ◽  
Eye Movement ◽  
Research Progress ◽  
Dynamic Scenes ◽  
Scene Processing ◽  
High Level ◽  
Holding Back

The use of eye movements to explore scene processing has exploded over the last decade. Eye movements provide distinct advantages when examining scene processing because they are both fast and spatially measurable. By using eye movements, researchers have investigated many questions about scene processing. Our review will focus on research performed in the last decade examining: (1) attention and eye movements; (2) where you look; (3) influence of task; (4) memory and scene representations; and (5) dynamic scenes and eye movements. Although typically addressed as separate issues, we argue that these distinctions are now holding back research progress. Instead, it is time to examine the intersections of these seemingly separate influences and examine the intersectionality of how these influences interact to more completely understand what eye movements can tell us about scene processing.

NREM delta stimulation following MK-801 is a response of sleep systems

1996 ◽  
Vol 76 (6) ◽  
pp. 3714-3720 ◽  
Author(s):  
I. G. Campbell ◽  
I. Feinberg
Keyword(s):  
Sleep Deprivation ◽  
Eye Movement ◽  
Time Course ◽  
Sleep Onset ◽  
Nrem Sleep ◽  
Rapid Eye Movement ◽  
Mk 801 ◽  
Regulatory Systems ◽  
Sleep Centers ◽  
Electroencephalogram Eeg

1. We have previously shown that noncompetitive blockade of the N-methyl-D-aspartate (NMDA)-gated cation channel with ketamine or Dizocilpine maleate (MK-801) increases the intensity of non-rapid-eye-movement (NREM) delta during subsequent sleep. This delta increase [measured as integrated amplitude (IA) in 1- to 4-Hz electroencephalogram (EEG)] occurs in the 12-h period following intraperitoneal injection. However, the 12 h after drug injection is also the period in which these drugs induce neurotoxic changes, raising the possibility that the increased delta represents toxic EEG slowing rather than an increase in the physiological delta waves of NREM sleep. 2. We hypothesized that the time course of delta stimulation could be separated from the time course of neurotoxicity. We tested this hypothesis by injecting 0.3 mg/kg MK-801 at the start of the dark period (DP) and depriving rats of sleep until the onset of the light period (LP) 12 h later. 3. There were two control groups: one received MK-801 at the start of the DP with no further manipulation, and the second received a saline injection at DP onset followed by 12 h of sleep deprivation. The dependent variable was the amount of delta IA in the LP, whose onset was 12 h after MK-801 injection. Total IA in the LP was significantly greater in rats that received MK-801 followed by sleep deprivation than in rats that received sleep deprivation alone or MK-801 alone. 4. This finding indicates that delta stimulation by MK-801 is maintained over 12 h of waking, indicating that the delta increase is not due to toxic EEG slowing or persisting MK-801. Instead, NMDA channel blockade by MK-801 increases the homeostatic need for delta or else directly alters sleep regulatory systems. We speculate that these effects are mediated by hypothalamic sleep centers through control of neuroendocrine pulses that produce both NREM and rapid-eye-movement sleep. 5. Imposing a period of waking between drug administration and sleep onset may prove a generally useful strategy for determining whether a drug affects the homeostatic need for sleep or acutely stimulates sleep systems. This strategy can also help distinguish between toxic and physiological increases in delta EEG.

scholarly journals Time course of spatiotopic updating across saccades

2019 ◽  
Vol 116 (6) ◽  
pp. 2027-2032 ◽  
Author(s):  
Jasper H. Fabius ◽  
Alessio Fracasso ◽  
Tanja C. W. Nijboer ◽  
Stefan Van der Stigchel
Keyword(s):  
Eye Movements ◽  
Visual System ◽  
Eye Movement ◽  
Time Course ◽  
Saccadic Eye Movements ◽  
Oculomotor System ◽  
Stimulus Onset ◽  
Oculomotor Behavior ◽  
Behavioral Studies ◽  
The Brain

Humans move their eyes several times per second, yet we perceive the outside world as continuous despite the sudden disruptions created by each eye movement. To date, the mechanism that the brain employs to achieve visual continuity across eye movements remains unclear. While it has been proposed that the oculomotor system quickly updates and informs the visual system about the upcoming eye movement, behavioral studies investigating the time course of this updating suggest the involvement of a slow mechanism, estimated to take more than 500 ms to operate effectively. This is a surprisingly slow estimate, because both the visual system and the oculomotor system process information faster. If spatiotopic updating is indeed this slow, it cannot contribute to perceptual continuity, because it is outside the temporal regime of typical oculomotor behavior. Here, we argue that the behavioral paradigms that have been used previously are suboptimal to measure the speed of spatiotopic updating. In this study, we used a fast gaze-contingent paradigm, using high phi as a continuous stimulus across eye movements. We observed fast spatiotopic updating within 150 ms after stimulus onset. The results suggest the involvement of a fast updating mechanism that predictively influences visual perception after an eye movement. The temporal characteristics of this mechanism are compatible with the rate at which saccadic eye movements are typically observed in natural viewing.

Precerebellar Hindbrain Neurons Encoding Eye Velocity During Vestibular and Optokinetic Behavior in the Goldfish

2006 ◽  
Vol 96 (3) ◽  
pp. 1370-1382 ◽  
Author(s):  
James C. Beck ◽  
Paul Rothnie ◽  
Hans Straka ◽  
Susan L. Wearne ◽  
Robert Baker
Keyword(s):  
Firing Rate ◽  
Eye Movement ◽  
Time Course ◽  
Mossy Fiber ◽  
Vestibular Stimulation ◽  
Neuronal Firing ◽  
Velocity Storage ◽  
Head Velocity ◽  
Motor Error ◽  
Eye Velocity

Elucidating the causal role of head and eye movement signaling during cerebellar-dependent oculomotor behavior and plasticity is contingent on knowledge of precerebellar structure and function. To address this question, single-unit extracellular recordings were made from hindbrain Area II neurons that provide a major mossy fiber projection to the goldfish vestibulolateral cerebellum. During spontaneous behavior, Area II neurons exhibited minimal eye position and saccadic sensitivity. Sinusoidal visual and vestibular stimulation over a broad frequency range (0.1–4.0 Hz) demonstrated that firing rate mirrored the amplitude and phase of eye or head velocity, respectively. Table frequencies >1.0 Hz resulted in decreased firing rate relative to eye velocity gain, while phase was unchanged. During visual steps, neuronal discharge paralleled eye velocity latency (∼90 ms) and matched both the build-up and the time course of the decay (∼19 s) in eye velocity storage. Latency of neuronal discharge to table steps (40 ms) was significantly longer than for eye movement (17 ms), but firing rate rose faster than eye velocity to steady-state levels. The velocity sensitivity of Area II neurons was shown to equal (±10%) the sum of eye- and head-velocity firing rates as has been observed in cerebellar Purkinje cells. These results demonstrate that Area II neuronal firing closely emulates oculomotor performance. Conjoint signaling of head and eye velocity together with the termination pattern of each Area II neuron in the vestibulolateral lobe presents a unique eye-velocity brain stem-cerebellar pathway, eliminating the conceptual requirement of motor error signaling.

scholarly journals The time course of morphological processing in a second language

2013 ◽  
Vol 29 (1) ◽  
pp. 7-31 ◽  
Author(s):  
Harald Clahsen ◽  
Loay Balkhair ◽  
John-Sebastian Schutter ◽  
Ian Cunnings
Keyword(s):  
Eye Movement ◽  
Time Course ◽  
Native Speakers ◽  
Masked Priming ◽  
Judgment Task ◽  
Morphological Processing ◽  
Online Processing ◽  
Movement Data ◽  
L2 Learners ◽  
Complex Words

We report findings from psycholinguistic experiments investigating the detailed timing of processing morphologically complex words by proficient adult second (L2) language learners of English in comparison to adult native (L1) speakers of English. The first study employed the masked priming technique to investigate - ed forms with a group of advanced Arabic-speaking learners of English. The results replicate previously found L1/L2 differences in morphological priming, even though in the present experiment an extra temporal delay was offered after the presentation of the prime words. The second study examined the timing of constraints against inflected forms inside derived words in English using the eye-movement monitoring technique and an additional acceptability judgment task with highly advanced Dutch L2 learners of English in comparison to adult L1 English controls. Whilst offline the L2 learners performed native-like, the eye-movement data showed that their online processing was not affected by the morphological constraint against regular plurals inside derived words in the same way as in native speakers. Taken together, these findings indicate that L2 learners are not just slower than native speakers in processing morphologically complex words, but that the L2 comprehension system employs real-time grammatical analysis (in this case, morphological information) less than the L1 system.

scholarly journals Goal-driven modulation as a function of time in saccadic target selection

2008 ◽  
Vol 61 (10) ◽  
pp. 1553-1572 ◽  
Author(s):  
Wieske Van Zoest ◽  
Mieke Donk
Keyword(s):  
Eye Movement ◽  
Response Latency ◽  
Time Course ◽  
Target Selection ◽  
Visual Selection ◽  
Full Time ◽  
Specific Target ◽  
Different Dimensions ◽  
Saccadic Target ◽  
Speed Accuracy

Four experiments were performed to investigate the contribution of goal-driven modulation in saccadic target selection as a function of time. Observers were required to make an eye movement to a prespecified target that was concurrently presented with multiple nontargets and possibly one distractor. Target and distractor were defined in different dimensions (orientation dimension and colour dimension in Experiment 1), or were both defined in the same dimension (i.e., both defined in the orientation dimension in Experiment 2, or both defined in the colour dimension in Experiments 3 and 4). The identities of target and distractor were switched over conditions. Speed–accuracy functions were computed to examine the full time course of selection in each condition. There were three major results. First, the ability to exert goal-driven control increased as a function of response latency. Second, this ability depended on the specific target–distractor combination, yet was not a function of whether target and distractor were defined within or across dimensions. Third, goal-driven control was available earlier when target and distractor were dissimilar than when they were similar. It was concluded that the influence of goal-driven control in visual selection is not all or none, but is of a continuous nature.

scholarly journals The time course of implicit affective picture processing: An eye movement study.

Emotion ◽  
2013 ◽  
Vol 13 (4) ◽  
pp. 769-773 ◽  
Author(s):  
Eugene McSorley ◽  
Carien M. van Reekum
Keyword(s):  
Eye Movement ◽  
Time Course ◽  
Picture Processing ◽  
Movement Study

scholarly journals Maxwellian Eye Fixation during Natural Scene Perception

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Jean Duchesne ◽  
Vincent Bouvier ◽  
Julien Guillemé ◽  
Olivier A. Coubard
Keyword(s):  
Eye Movements ◽  
Eye Movement ◽  
Scene Perception ◽  
Random Motion ◽  
Natural Scenes ◽  
Movement Amplitude ◽  
Natural Scene ◽  
Eye Fixation ◽  
Free Viewing ◽  
Natural Scene Perception

When we explore a visual scene, our eyes make saccades to jump rapidly from one area to another and fixate regions of interest to extract useful information. While the role of fixation eye movements in vision has been widely studied, their random nature has been a hitherto neglected issue. Here we conducted two experiments to examine the Maxwellian nature of eye movements during fixation. In Experiment 1, eight participants were asked to perform free viewing of natural scenes displayed on a computer screen while their eye movements were recorded. For each participant, the probability density function (PDF) of eye movement amplitude during fixation obeyed the law established by Maxwell for describing molecule velocity in gas. Only the mean amplitude of eye movements varied with expertise, which was lower in experts than novice participants. In Experiment 2, two participants underwent fixed time, free viewing of natural scenes and of their scrambled version while their eye movements were recorded. Again, the PDF of eye movement amplitude during fixation obeyed Maxwell’s law for each participant and for each scene condition (normal or scrambled). The results suggest that eye fixation during natural scene perception describes a random motion regardless of top-down or of bottom-up processes.

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