Eye fixation–related potentials (EFRPs) during object identification

Rämä, Pia; Baccino, Thierry

doi:10.1017/s0952523810000283

Cited by 60 publications

(32 citation statements)

References 29 publications

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“…These findings would significantly contribute to the interpretation of scan paths and fixations during real-life activities. For example, EFRPs are useful for the investigation of early lexical processes and for establishing a timeline of these processes during reading (Baccino and Manunta 2005) or during object identification (Rama and Baccino 2010). …”

Section: Discussionmentioning

confidence: 99%

New insights into ambient and focal visual fixations using an automatic classification algorithm

2011

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Overt visual attention is the act of directing the eyes toward a given area. These eye movements are characterised by saccades and fixations. A debate currently surrounds the role of visual fixations. Do they all have the same role in the free viewing of natural scenes? Recent studies suggest that at least two types of visual fixations exist: focal and ambient. The former is believed to be used to inspect local areas accurately, whereas the latter is used to obtain the context of the scene. We investigated the use of an automated system to cluster visual fixations in two groups using four types of natural scene images. We found new evidence to support a focal–ambient dichotomy. Our data indicate that the determining factor is the saccade amplitude. The dependence on the low-level visual features and the time course of these two kinds of visual fixations were examined. Our results demonstrate that there is an interplay between both fixation populations and that focal fixations are more dependent on low-level visual features than are ambient fixations.

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Section: Discussionmentioning

confidence: 99%

New insights into ambient and focal visual fixations using an automatic classification algorithm

2011

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“…Despite the existence of a large amount of studies describing EFRPs, almost all of them are performed in well-controlled laboratory studies using simple stimuli [11]. More important, even those studies using more natural stimuli typically employ static images, avoid gaze shifts or instructed subjects to fixate during long periods (>300ms) [8], [12], [13]. This has allowed to identify discriminat late EFRP components [8], even at a single subject level [11].…”

Section: Discussionmentioning

confidence: 99%

EEG correlates of active visual search during simulated driving: An exploratory study

Renold

Chavarriaga

Gheorghe

et al. 2014

2014 IEEE International Conference on Systems, Man, and Cybernetics (SMC)

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Abstract-Brain responses to visual stimuli can provide information about visual recognition processes. Several studies have shown stimulus-dependent modulation of the evoked neural responses after gaze shifts (i.e. eye fixation related potentials, EFRP) depending on the relevance of the fixated object. However these studies are typically performed on still images under constrained conditions. Here we extend this approach to study overt visual attention during a simulated driving task. Simultaneous analysis of eye-tracking and electroencephalography data revealed similar patterns than those previously reported. However, natural visual exploration yielded shorter fixations, which imposes constraints in the analysis of the elicited brain responses. Nevertheless, we found significant differences between EFRPs corresponding to target objects or non-object stimuli. These results suggest the possibility of decoding such information during driving, allowing better understanding of how drivers process the environmental information.

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“…It is generally held that conventional ERP components such as the P1 and the N1 can be identified in FRPs or SRPs (Baccino & Manunta, 2005;Belopolsky et al, 2008;Kazai & Yagi, 2003;Ossandón et al, 2010;Rämä & Baccino, 2010) as well as later components such as the N400 (Dimigen et al, 2011). A review of studies on FRPs and SRPs in reading is given by Dimigen et al (2011).…”

Section: Introductionmentioning

confidence: 98%

Distinguishing between target and nontarget fixations in a visual search task using fixation-related potentials

Brouwer¹,

Reuderink²,

Vincent

et al. 2013

Journal of Vision

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The P300 event-related potential (ERP) can be used to infer whether an observer is looking at a target or not. Common practice in P300 experiments and applications is that observers are asked to fixate their eyes while stimuli are presented. We investigated the possibility to differentiate between single target and nontarget fixations in a target search task involving eye movements by using EEG epochs synchronized to fixation onset (fixation-related potentials: FRPs). Participants systematically scanned search displays consisting of six small Landolt Cs in search of Cs with a particular orientation. After each search display, they indicated whether and where target Cs had been presented. As expected, an FRP component consistent with the P300 reliably distinguished between target and nontarget fixations. It was possible to classify single FRPs into target and nontarget FRPs above chance (on average 62% correct, where 50% would be chance). These results are the first step to practical applications such as covertly monitoring observers' interests and supporting search tasks.

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Eye fixation–related potentials (EFRPs) during object identification

Cited by 60 publications

References 29 publications

New insights into ambient and focal visual fixations using an automatic classification algorithm

New insights into ambient and focal visual fixations using an automatic classification algorithm

EEG correlates of active visual search during simulated driving: An exploratory study

Distinguishing between target and nontarget fixations in a visual search task using fixation-related potentials

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