Brightness enhancement in flickering light.

Jahn, Theodore L.

doi:10.1037/h0053622

Cited by 17 publications

(3 citation statements)

References 21 publications

(12 reference statements)

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“…This study was motivated by the pronounced dissociation between luminance and brightness judgments induced by flickering stimuli 19 – 25 . Here we aimed to answer two questions: (1) Would we find the largest brightness enhancement for stimuli flickering in the theta (4–5 Hz) or alpha (9–10 Hz) range?…”

Section: Discussionmentioning

confidence: 99%

Entrainment of theta, not alpha, oscillations is predictive of the brightness enhancement of a flickering stimulus

Bertrand

Wispinski

Mathewson

et al. 2018

Sci Rep

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Frequency-dependent brightness enhancement, where a flickering light can appear twice as bright as an equiluminant constant light, has been reported to exist within the alpha (8–12 Hz) band. Could oscillatory neural activity be driving this perceptual effect? Here, in two experiments, human subjects reported which of two flickering stimuli were brighter. Strikingly, 4 Hz stimuli were reported as brighter more than 80% of the time when compared to all other tested frequencies, even though all stimuli were equiluminant and of equal temporal length. Electroencephalography recordings showed that inter-trial phase coherence (ITC) of theta (4 Hz) was: (1) Significantly greater than alpha, contralateral to the flickering stimulus; (2) Enhanced by the presence of a second ipsilateral 4 Hz flickering stimulus; and (3) Uniquely lateralized, unlike the alpha band. Importantly, on trials with two identical stimuli (i.e. 4 Hz vs 4 Hz), the brightness discrimination judgment could be predicted by the hemispheric balance in the amount of 4 Hz ITC. We speculate that the theta rhythm plays a distinct information transfer role, where its ability to share information between hemispheres via entrainment promotes a better processing of visual information to inform a discrimination decision.

show abstract

Section: Discussionmentioning

confidence: 99%

Entrainment of theta, not alpha, oscillations is predictive of the brightness enhancement of a flickering stimulus

Bertrand

Wispinski

Mathewson

et al. 2018

Sci Rep

View full text Add to dashboard Cite

show abstract

“…This study was motivated by the pronounced dissociation between luminance and brightness judgments induced by flickering stimuli [19][20][21][22][23][24][25] . Here we aimed to answer two questions: 1) Would we find the largest brightness enhancement for stimuli flickering in the theta (4-5 Hz) or alpha We were able to confirm that this ITC effect was not due to a general increase in 4.4 Hz band ITC (e.g.…”

Section: Discussionmentioning

confidence: 99%

Entrainment of theta, not alpha, oscillations is predictive of the brightness enhancement of a flickering stimulus

Bertrand

Wispinski

Mathewson

et al. 2017

Preprint

View full text Add to dashboard Cite

Frequency-dependent brightness enhancement, where a flickering light can appear twice as bright as an equiluminant constant light, has been reported to exist within the alpha (8 – 12 Hz) band. Could oscillatory neural activity be driving this perceptual effect? Here, in two experiments, human subjects reported which of two flickering stimuli were brighter. Strikingly, 4 Hz stimuli were reported as brighter more than 80% of the time when compared to all other tested frequencies, even though all stimuli were equiluminant and of equal temporal length. Electroencephalography recordings showed that inter-trial phase coherence (ITC) of theta (4 Hz) was: 1) Significantly greater than alpha, contralateral to the flickering stimulus; 2) Enhanced by the presence of a second ipsilateral 4 Hz flickering stimulus; and 3) Uniquely lateralized, unlike the alpha band. Importantly, on trials with two identical stimuli (i.e. 4 Hz vs 4 Hz), the brightness discrimination judgment could be predicted by the hemispheric balance in the amount of 4 Hz ITC. We speculate that the theta rhythm plays a distinct information transfer role, where its ability to share information between hemispheres via entrainment promotes a better processing of visual information to inform a discrimination decision.

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“…Some hypotheses which attempt to explain this phenomenon have also been proposed. They are based on photochemical processes (Broca & Sulzer, 1903;Jahn, 1944), neural on-response (Boynton & Kandel, 1957), backward masking (Raab, 1963), and so on. Recently, Arend (1973) ascribed the effect to the contour displacement of a test stimulus caused by the eye movement.…”

mentioning

confidence: 99%

A relationship between the Broca-Sulzer effect and visually evoked potentials

et al. 1981

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The relationship between the Broca-Sulzer effect and visually evoked potentials (VEPs) was examined with two subjects. In the psychophysical experiment, a flash of disc subtending 52' in visual angle and of one of the 11 durations ranging from 0 (no stimulus) to 1 000 ms was presented by means of a Maxwellian view system. The luminance levels were at 312, 987, and 3 120 cd/m2. Brightness judgments were made with the method of magnitude estimation. In the VEP experiment, 300-summed VEPs were obtained from 01 in the 10-20 system at six durations ranging from 0 to 500 ms and at 312 and 3 120 cd/m2. As to the VEP components (P1, N1, P2, N2), two indices of the areas QP1N1P2 and QNiP2N2 were measured with a planimeter and were used for the analysis. The results indicated the positive correlation between the apparent brightness enhancement and the VEP responses.

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Brightness enhancement in flickering light.

Cited by 17 publications

References 21 publications

Entrainment of theta, not alpha, oscillations is predictive of the brightness enhancement of a flickering stimulus

Entrainment of theta, not alpha, oscillations is predictive of the brightness enhancement of a flickering stimulus

Entrainment of theta, not alpha, oscillations is predictive of the brightness enhancement of a flickering stimulus

A relationship between the Broca-Sulzer effect and visually evoked potentials

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