What factors affect critical flicker fusion frequency?

The research is trying to find the influence factors of CFF (Critical Flicker Frequency) from these factors: light spot intensity strength, light spot color, eyesight, gender.

What is critical flicker fusion frequency?

Critical Flicker-Fusion Frequency (CFF), the frequency at which a flickering light is perceived as continuous, is widely used for evaluating visual temporal processing. Our results highlight the suitability of the adaptive paradigm for efficiently measuring temporal resolution in the visual system.

What is critical flicker fusion in film?

Critical flicker fusion frequency (CFFF) is the frequency at which an intermittent light stimulus appears to be completely steady to the observer. If the frequency at which frames are displayed in a film falls below the CFFF, then the image will be perceived as jerky.

What is CFF test?

Abstract. Background: A critical flicker frequency (CFF) ≤39 Hz identifies cirrhotic patients with minimal hepatic encephalopathy (mHE) and predicts the risk of both overt hepatic encephalopathy (oHE) and mortality in patients with previous episodes of decompensation and/or oHE.

What animal has the highest flicker fusion rate?

Pigeons have been shown to have higher threshold than humans (100 Hz vs. 75 Hz), and the same is probably true for all birds, particularly birds of prey. Many mammals have a higher proportion of rods in their retina than humans do, and it is likely that they would also have higher flicker fusion thresholds.

Do people with different eye color have different threshold flicker sensitivity?

Different people have slightly different flicker “threshold” frequencies (known as the critical flicker frequency, or CFF). A 1973 study (“The Effect of Iris Color on Critical Flicker Frequency,” Journal of General Psychology [1973], 91–95) obtained the following data from a random sample of 19 subjects.

What is the max frequency humans can see?

In the past, experts maintained that most people’s maximum ability to detect flicker ranged between 50 and 90 Hz, or that the maximum number of frames per second that a person could see topped out around 60.

What is a flicker test?

Flicker perimetry is a visual field test procedure that evaluates an observer’s ability to detect light/dark stimulus alternations (flicker) at various locations in the field of view. Contrast modulation flicker uses a stimulus that is matched in luminance to the background.

What frequency can eyes see?

Flicker is the perception of visual fluctuations in intensity and unsteadiness in the presence of a light stimulus, that is seen by a static observer within a static environment. Flicker that is visible to the human eye will operate at a frequency of up to 80 Hz.

Can our eyes see 8K?

At four times the horizontal and vertical resolution of 1080p and sixteen times the overall pixels, 8K images — named for the approximate number of pixels along the horizontal axis — are likely the clearest digital pictures the human eye will ever see.

Can humans see 240 fps?

The human eye can see at around 60 FPS and potentially a little more. Some humans believe they can see up to 240 FPS, and some testing has been done to prove this. Getting humans to see the difference between something that is 60 FPS and 240 FPS should be rather easy.