A Random-Dot Kinematogram for Web-Based Vision Research

Rajananda, Sivananda; Lau, Hakwan; Odegaard, Brian

doi:10.5334/jors.194

Cited by 40 publications

(31 citation statements)

References 12 publications

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“…The experiment was conducted online. Experimental scripts for stimulus presentation and response collection were written in HTML with a JavaScript library js P sych 6.0.5 (de Leeuw, 2015) and the jspsych-rdk plugin (Rajananda et al, 2018). The online experiment was hosted on a web server Pavlovia (pavlovia.org), and participants performed the experiment in web browsers on their computers.…”

Section: Methodsmentioning

confidence: 99%

“…In each frame, a proportion of dots (namely the motion coherence) was replotted at an appropriate spatial displacement in the direction of motion (2 pixels/frame velocity), relative to their positions in the last frame, and the rest of the dots were replotted at random locations within the aperture. To minimise the impact of local motion information from individual dots, all dots were replotted at random locations after every 7 frames (Rajananda et al, 2018).…”

Section: Stimulimentioning

confidence: 99%

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Imperfect integration: sensory congruency between multiple sources modulates selective decision-making processes

Krzemiński

Zhang

2021

Preprint

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Decision making on the basis of multiple information sources is common. However, to what extent such decisions differ from those with a single source remains unclear. Here, we combined cognitive modelling and neural-mass modelling to characterise the neurocognitive process underlying decision-making with single or double information sources. Ninety-four human participants performed binary decisions to discriminate the coherent motion direction averaged across two independent apertures. Regardless the angular distance of the apertures, separating motion information into two apertures resulted in a reduction in accuracy. Our modelling results further showed that the addition of the second information source led to a lower signal-to-noise ratio of evidence accumulation with two congruent information sources, and a change in the decision strategy of speed-accuracy trade-off with two incongruent sources. Thus, our findings support a robust behavioural change in relation to multiple information sources, which have congruency-dependent impacts on selective decision-making subcomponents.

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Section: Methodsmentioning

confidence: 99%

Section: Stimulimentioning

confidence: 99%

Imperfect integration: sensory congruency between multiple sources modulates selective decision-making processes

Krzemiński

Zhang

2021

Preprint

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show abstract

“…This experiment was conducted online, and participants completed the study in a web browser on devices they provided. Stimulus presentation for the experiment was managed using jsPsych (de Leeuw, 2015) with customized plugins based on previous RDK code (Rajananda, Lau, & Odegaard, 2018). A central, circular RDK (400 by 400 px) was presented on a 2 p h black background and consisted of two sets of 100 independently moving dots (radius 5 px).…”

Section: Stimulimentioning

confidence: 99%

Efficient tuning of attention to narrow and broad ranges of task-relevant feature values

Chapman¹,

Störmer²

2021

Preprint

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Feature-based attention is the ability to select relevant information on the basis of visual features, such as a particular color or motion direction. In contrast to spatial attention, where the attentional focus has been shown to be flexibly adjustable to select small or large regions, it is unclear whether feature-based attention can be efficiently tuned to different feature ranges. Here, we establish that the focus of feature-based attention can be adjusted more broadly or narrowly to select currently relevant features. Participants attended to a set of target-colored dots among distractor dots to detect brief decreases in luminance (Experiments 1a and 1b) or bursts of coherent motion (Experiments 2). To vary the size of the attentional focus, we manipulated the range of colors that the target dots spanned and found that while participants’ performance decreased with larger feature ranges to select, it remained at a relatively high level even at the largest color range, suggesting that broadening the focus of feature-based attention comes only at a small cost and that large feature ranges can be selected relatively efficiently at once. We further show that this broad selection occurs uniformly in color space (Experiment 3). Overall, our findings argue against the idea that feature-based attention is limited to a single feature value at a time and demonstrate that selecting large swaths of feature space is surprisingly efficient. Broadly, these results are consistent with accounts that propose a flexible and generalized set of attentional mechanisms that act across both spatial and feature-based domains.

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“…This becomes more difficult as the percentage of coherently moving dots is decreased. Although this is a classic and well‐established paradigm that has been broadly used to test coherent visual motion perception (Britten et al., 1992; Morgan & Ward, 1980; Rajananda et al., 2018; Shadlen & Newsome, 1996; Williams & Sekuler, 1984), and has also been applied in many clinical populations, such as autism (Milne et al., 2002; Robertson et al., 2012) and Alzheimer's disease (Fernandez & Duffy, 2012; Fernandez et al., 2013; Li et al., 2017; Song & Wang, 2020), surprisingly little is known about RDK performance in PD.…”

Section: Introductionmentioning

confidence: 99%

Overconfidence in visual perception in parkinson's disease

Halperin

Karni

Israeli‐Korn

et al. 2021

Eur J of Neuroscience

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Parkinson's disease (PD) is a neurodegenerative disorder primarily characterized by its motor symptoms, including: bradykinesia, akinesia, muscular rigidity, resting tremor, freezing of gait (FOG), and impaired gait and balance (Almeida & Lebold, 2010; DeMaagd & Philip, 2015; Postuma et al., 2015). However, also non-motor symptoms manifest in PD, such as autonomic, cognitive, neurobehavioral, sleep, sensory, and perceptual impairments, and these can have an important impact on a patient's function and

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A Random-Dot Kinematogram for Web-Based Vision Research

Cited by 40 publications

References 12 publications

Imperfect integration: sensory congruency between multiple sources modulates selective decision-making processes

Imperfect integration: sensory congruency between multiple sources modulates selective decision-making processes

Efficient tuning of attention to narrow and broad ranges of task-relevant feature values

Overconfidence in visual perception in parkinson's disease

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