SHINE_color: Controlling low-level properties of colorful images

Dal Ben, Rodrigo

doi:10.1016/j.mex.2023.102377

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…The visual stimuli consisted of colored RGB Gabor patches (orange standards: RGB 229 133 126, magenta targets: RGB 229 90 172, green fixation point for participants #1-15: RGB 151 199 62; purple fixation point for participants #16-37: RGB 180 137 205) with a 10-degree orientation and a frequency of 0.1 cycles/pixel, created using an online Gabor-patch generator (https://www.cogsci.nl/gabor-generator). Visual stimuli were made isoluminant with the grey screen background (RGB 167 167 167) using the SHINEcolor toolbox (Dal Ben, 2023). The visual and auditory stimuli were presented at average frequencies of 1.1 Hz and 1.4 Hz, respectively.…”

Section: Methodsmentioning

confidence: 99%

Strength of low-frequency EEG phase entrainment to external stimuli is associated with fluctuations in the brain’s internal state

Mäki-Marttunen,

Velinov,

Nieuwenhuis

2024

Preprint

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The brain attends to environmental rhythms by aligning the phase of internal oscillations. However, the factors underlying fluctuations in the strength of this phase entrainment remain largely unknown. In the present study we examined if the strength of low-frequency EEG phase entrainment to rhythmic stimulus sequences varied with pupil size and posterior alpha-band power, thought to reflect arousal level and excitability of posterior cortical brain areas, respectively. We recorded pupil size and scalp EEG while participants carried out an intermodal selective attention task, in which they were instructed to attend to a rhythmic sequence of visual or auditory stimuli and ignore the other perceptual modality. As expected, intertrial phase coherence (ITC), a measure of entrainment strength, was larger for the task-relevant than for the task-irrelevant modality. Across the experiment, pupil size and posterior alpha power were strongly linked with each other, and ITC tracked pupil size: with increasing pupil size, entrainment was higher to the task-relevant stimulus sequence and lower to the task-irrelevant stimulus sequence. Exploratory analyses showed that a temporal relation between ITC and posterior alpha power emerged in the time periods around pupil peaks and pupil troughs. These results indicate that endogenous sources contribute distinctly to the fluctuations of EEG phase entrainment.

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Section: Methodsmentioning

confidence: 99%

Strength of low-frequency EEG phase entrainment to external stimuli is associated with fluctuations in the brain’s internal state

Mäki-Marttunen,

Velinov,

Nieuwenhuis

2024

Preprint

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“…Figure 1 illustrates how the scene photos from the studies were categorized into four cases: constant upright scene, inconsistent upright scene, consistent inverted scene, and inconsistent inverted scene. All photos were transformed to grayscale maps, and the images were then equalized by SHINE Toolbox to make sure the tests were unaffected by other low-level properties (brightness, contrast, and grayscale) [14] .…”

Section: Stimulimentioning

confidence: 99%

The role of orientation features in visual processing

tong

2024

International Conference on Optics and Machine Vision (ICOMV 2024)

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Target recognition is an essential study path in computer vision since it helps recognize and localize image-specific target items. Scene context has been discovered to influence target recognition performance. What function does object and backdrop orientation play in the target recognition process? In the present study, consistent and inconsistent objects are shown in upright and inverted scenarios. In the experiments, whether in upright or inverted scenes, the response time for object recognition is shorter in consistent scenes than in inconsistent ones, and when the scenes are consistent and the object orientation is upright, there is a significant difference in the background orientation, with the response time for a upright background being significantly lower than that for an inverted one. Meanwhile, when the scenes are inconsistent and the background orientation is upright, objects with upright orientation have a considerably shorter reaction time than inverted objects. Taken together, these findings indicate that the orientation properties of the item and the background influence object recognition in the scene.

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Immersive scene representation in human visual cortex with ultra-wide-angle neuroimaging

Park,

Soucy,

Segawa

et al. 2024

Nat Commun

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While human vision spans 220°, traditional functional MRI setups display images only up to central 10-15°. Thus, it remains unknown how the brain represents a scene perceived across the full visual field. Here, we introduce a method for ultra-wide angle display and probe signatures of immersive scene representation. An unobstructed view of 175° is achieved by bouncing the projected image off angled-mirrors onto a custom-built curved screen. To avoid perceptual distortion, scenes are created with wide field-of-view from custom virtual environments. We find that immersive scene representation drives medial cortex with far-peripheral preferences, but shows minimal modulation in classic scene regions. Further, scene and face-selective regions maintain their content preferences even with extreme far-periphery stimulation, highlighting that not all far-peripheral information is automatically integrated into scene regions computations. This work provides clarifying evidence on content vs. peripheral preferences in scene representation and opens new avenues to research immersive vision.

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SHINE_color: Controlling low-level properties of colorful images

Cited by 5 publications

References 10 publications

Strength of low-frequency EEG phase entrainment to external stimuli is associated with fluctuations in the brain’s internal state

Strength of low-frequency EEG phase entrainment to external stimuli is associated with fluctuations in the brain’s internal state

The role of orientation features in visual processing

Immersive scene representation in human visual cortex with ultra-wide-angle neuroimaging

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