Sentences with word «phosphene»

The authors concluded that this case was rare in its presentation of chronic continuous visual phosphene hallucinations following occipital stroke.

Rafique and colleagues (2016) examined the effectiveness of multi-day rTMS to the occipital cortex in a patient with continuous visual phosphene hallucinations for more than 2 years following occipital stroke.

The researchers also repositioned the coil on the inquirer's head at the start of each game, but for the control games, added a plastic spacer undetectable to the participant that weakened the magnetic field enough to prevent the generation of phosphenes.

Peter Schiller of the Massachusetts Institute of Technology and his colleagues stimulated these brain areas in monkeys to work out what phosphenes look like to them and where they appear.

In humans, microstimulation of primary visual cortex has been shown to induce phosphenes (Schmidt et al., 1996), and microstimulation of the substantia nigra can influence reinforcement learning (Ramayya et al., 2014).

This produces phosphenes, the same sensation of light created by rubbing one's eyes.

Looking directly at the Sun causes phosphene visual artifacts and temporary partial blindness.

Electrical stimulation of the left fusiform gyrus caused either no perceptual change or more low - level changes such as twinkling and sparkling, traveling blue and white balls, flashes of light — so - called phosphenes — but no change in the character of the perceived face.

This study provided Class IV evidence in a single - case report that multi-day rTMS reduced intra-hemispheric and inter-hemispheric imbalance and associated visual phosphene hallucinations following occipital stroke.

People notice these «phosphenes» even if their eyes are closed or they are blind.

Artificial retinas, light - sensitive chips that mimic the eye's signal - processing ability and stimulate the optic nerve or visual cortex, have been tested in a handful of blind subjects who usually «see» nothing more than phosphenes, or flashes of light.

The subjects had to navigate 21 different mazes, with two choices to move forward or down based on whether they sensed a visual stimulation artifact called a phosphene, which are perceived as blobs or bars of light.

To signal which direction to move, the researchers generated a phosphene through transcranial magnetic stimulation, a well - known technique that uses a magnetic coil placed near the skull to directly and noninvasively stimulate a specific area of the brain.

The initial experiment used binary information — whether a phosphene was present or not — to let the game players know whether there was an obstacle in front of them in the maze.

Artificial retinas, light - sensitive chips that mimic the eye's signal - processing ability and stimulate the optical nerve or visual cortex, have been tested in a handful of blind subjects who usually «see» nothing more than phosphenes, or flashes of light.

Incorrect guesses in the real games could be caused by several factors, the most likely being uncertainty about whether a phosphene had appeared.

But only a «yes» answer generates a response intense enough to stimulate the visual cortex and cause the inquirer to see a flash of light known as a «phosphene.»

The phosphene — which might look like a blob, waves or a thin line — is created through a brief disruption in the visual field and tells the inquirer the answer is yes.

Increased application of rTMS corresponded with a reduction in intensity of visual phosphene hallucinations and was reflected in altered blood oxygen level - dependent signal; fMRI revealed focal excitatory discharges at the border of the lesion, highlighting the origin of phosphenes.

Either one can then send messages to your brain, and signals from the eye to the brain get interpreted as light, whether or not actual light is entering the eye (the rings or spots of light you see are called phosphenes).