Effect of Stimulus Luminance and Adapting Luminance on Viewing Mode and Display White Appearance

2018 ◽  
Vol 2018 (1) ◽  
pp. 308-312 ◽  
Author(s):  
Minchen Wei ◽  
Siyuan Chen ◽  
Ming Ronnier Luo
Keyword(s):  
Stimulus Luminance

Perception lag as a function of stimulus luminance

1963 ◽  
Vol 3 (1-2) ◽  
pp. 81-91 ◽  
Author(s):  
J.A.J. Roufs
Keyword(s):  
Stimulus Luminance

scholarly journals An initial ‘snapshot’ of sensory information biases the likelihood and speed of subsequent changes of mind

2020 ◽  
Author(s):  
William Turner ◽  
Daniel Feuerriegel ◽  
Robert Hester ◽  
Stefan Bode
Keyword(s):  
Diffusion Model ◽  
Discrimination Task ◽  
Sensory Information ◽  
Reverse Correlation ◽  
Stimulus Luminance ◽  
Evidence Accumulation ◽  
Initial Decision ◽  
Unresolved Question ◽  
New Information ◽  
Luminance Discrimination

AbstractWe often need to rapidly change our mind about perceptual decisions in order to account for new information and correct mistakes. One fundamental, unresolved question is whether information processed prior to a decision being made (‘pre-decisional information’) has any influence on the likelihood and speed with which that decision is reversed. We investigated this using a luminance discrimination task in which participants indicated which of two flickering greyscale squares was brightest. Following an initial decision, the stimuli briefly remained on screen, and participants could change their response. Using psychophysical reverse correlation, we examined how moment-to-moment fluctuations in stimulus luminance affected participants’ decisions. This revealed that the strength of even the very earliest (pre-decisional) evidence was associated with the likelihood and speed of later changes of mind. To account for this effect, we propose an extended diffusion model in which an initial ‘snapshot’ of sensory information biases ongoing evidence accumulation.

Stimulus luminance and dichoptic pattern masking

1977 ◽  
Vol 17 (3) ◽  
pp. 385-390
Author(s):  
J.S. Monahan ◽  
R.J. Steronko
Keyword(s):  
Stimulus Luminance ◽  
Pattern Masking

Topographic Spatial Summation in Glaucoma

2007 ◽  
Vol 17 (4) ◽  
pp. 538-544 ◽  
Author(s):  
M. Gonzalez De La Rosa ◽  
M. Gonzalez-Hernandez ◽  
V. Lozano Lopez ◽  
D. Perera Sanz
Keyword(s):  
Visual Field ◽  
Dynamic Range ◽  
Normal Population ◽  
Spatial Summation ◽  
Normal Subjects ◽  
Stimulus Luminance ◽  
Central Visual Field ◽  
Visual Field Examination ◽  
K Value ◽  
Local Defects

Purpose Stimulus luminance (L) and area (A) are related by the equation LxAk=constant. The authors evaluated the k value at 66 positions of the central visual field in patients with glaucoma, to modify L and A simultaneously in order to examine advanced glaucomas with a bigger dynamic range. Methods The luminance limitation of a computer screen with automatic photometric control was compensated for by increasing the stimulus area in the range between 0 and 17 dB, using the k topographic values previously calculated on normal subjects. Four initial series of 21, 12, 10, and 10 glaucomas were sequentially examined with the Octopus 311 in which the stimulus size cannot be freely changed during the examination, and with the experimental method (Pulsar-SAP) modifying stimulus sizes to equal the results. k Final estimation was verified in 60 new cases. Results k Values increase progressively with defect deepness. Values higher than those of the normal population with equivalent topographic differences were obtained. Correlation between indices was as follows: MD: r=0.94 (p<0.0001); square root of the loss of variance (sLV): r=0.93 (p<0.0001). Frequency of local defects was similar in both procedures. Average topographic differences between thresholds were usually less than 1 dB. The average threshold difference favored Pulsar-SAP by 0.45 dB at those points where the average threshold of both examinations was less than 18 dB and 0.37 dB where such average was higher than or equal to 18 dB. Conclusions k Value is higher in patients with glaucoma than in normal subjects, although the topographic features are similar. It is feasible to design a scale combining stimulus luminance and sizes to use screens with relative low brightness as surfaces for visual field examination.

scholarly journals Visible persistence following a brief increment in stimulus luminance

1991 ◽  
Vol 49 (3) ◽  
pp. 212-226
Author(s):  
Craig D. Clark ◽  
John H. Hogben
Keyword(s):  
Visible Persistence ◽  
Stimulus Luminance

Effects of Hypoxia on Peripheral Visual Response to Dim Stimuli

1975 ◽  
Vol 41 (2) ◽  
pp. 467-474 ◽  
Author(s):  
John L. Kobrick
Keyword(s):  
Visual Field ◽  
Signal Detection ◽  
Response Times ◽  
Detection Threshold ◽  
Threshold Value ◽  
Hypoxic Exposure ◽  
Visual Response ◽  
Stimulus Luminance ◽  
Direct Relation ◽  
Stimulus Contrast

Response times (RTs) of 9 Ss were obtained for detection of 48 flash stimuli distributed throughout the visual field during 3 ¼-hr. exposures to each of 4 hypoxia conditions (0, 13,000, 15,000, 17,000 feet equivalent elevation). The luminances of all stimuli were set in common at the detection threshold value for the visual periphery. RTs were impaired in direct relation to hypoxic exposure severity, the peak impairments occurring within 90 min. followed by gradual recovery. Since the present results showed less impairment than previous data for brighter stimuli using the same task, it is concluded that stimulus contrast is more critical to peripheral signal detection than absolute stimulus luminance, particularly under hypoxic exposure.

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