Word Of The Day 5-11-2017

phosphene

noun
phos·phene


Definition

an impression of light that occurs without light entering the eye and is usually caused by stimulation of the retina (as by pressure on the eyeball when the lid is closed) or by excitation of neurons in the visual system (as by transcranial magnetic stimulation).


Examples

Early studies have demonstrated that direct electrical stimulation to neurons of the visual system will cause a subject to perceive points of light — George Scarlatis


Did You Know?

Phosphenes are the luminous floating stars, zigzags, swirls, spirals, squiggles, and other shapes that you see when closing your eyes tight and pressing them with your fingers. Basically, these phenomena occur when the cells of the retina are stimulated by rubbing or after a forceful sneeze, cough, or blow to the head.


Origin

The word phosphene comes from the Greek words phōs(light)and phainein(to show. Phainein is also a contributing element in such words as diaphanous, emphasis, epiphany, and phenomenon.


https://www.merriam-webster.com/dictionary/phosphene

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s