Visual Acuity & Perception

Reversible Figure

If a drawing is presented wherein two parts are equally meaningful, there may be an alteration of figure and ground between them.

trivia!

For example:

The visual shape of a square-toppled table is a square only when we look at it from above.

Perception is a process by which we organize and interpret the patterns of stimuli in our environment, the immediate intuitive recognition, as of an aesthetic quality.

What

is

Visual?

two Types

of Vision

II. kinesthetic

*Man experiences space in the movements of the eye from one part of a whole work of art to another.

I. stereoscopic

The ability to overlap views, which are slightly different into one image. This visual process created sn illusion of three-dimensional depth, making it possible to judge distances.

Retinal Disparity

*One of the most frequently employed types of information especially over short distances.

*Unlikeness of the retinal images in the eyes, which are different spatial proportions.

If we hold up a cube in front of the eyes, the right eye will see slightly more of the side face on the right, the left eye slightly more of the side on the left.

reversible figure and ground

The reversible goblet is demonstration of a figureground reversal.

Note that either the light portion (the goblet) or the dark portion (two profiles) can be perceived as a figure against a background.

two people and a goblet

"Concave and Convex"

shows an exterior view of the left-hand house, an interior view of the right-hand and either an exterior or interior view of the house in the moddle, depending upon one's choice. 1995

Example:

If you look at the object, you will see a cross figure om a dark, background. With a fixed gaze closely on the field, a switch is made and the white cross becomes a background for the dark X figure.

left brain

function

right brain

function

VS

uses logic, detail oriented, facts rule, words and language, present and past, math and science, can comprehend knowing, acknowledges, order/pattern perception, knows object name, reality based, forms strategies, practical, safe.

uses feeling, “big picture” oriented, imagination rules, symbols and images,present and future, philosophy & religion, can “get it” (i.e. meaning), believes, appreciates, spatial perception, knows object function, fantasy based, presents possibilities, impetuous, risk taking.

PERCEPTION

means...

WHAT

IS

PERCEPTION?

The

ability to

see, hear,

or become

aware of

something

through

the senses.

Figureground

A phenomenon wherein drawings consisting of black lines, any line which surrounds an area, and which is recognized as representing an object is quicly picked by the observer, and it then seems to him to stand out from the background in an obvious manner. No field of view is perceived all at one dead level. Some part of it will always tend to become "figural" and to be differentiated from teh rest of the field which forms the "ground" to this figure. This figure then stands out out, is readlily perceived and tended to and its appence ad details are noted.

Vanity

When you look at this figure from afar it looks so much like a skull but when near, it clearly shows a lady in front of a mirror.

Perception of shape

The most important feature of a shape or object is its general outline or contour. Whenever we look at objects, they seem to be clearly outlined and demarcated from their background. With a solid object, the particular contour exhibited to us at any one moment varies with its position in space.

*demarcated - separate or distinguish from

Circle limit IV C (Heaven and Hell) a wood cut by M.C. eshes. The angels and evil alternate but neither seems to dominate the other looking at the black bat then swift to looking at the white dove.

Artistic use of reversible figure and ground

spatial

perception

Sharpness or keenness of

thought, vision, or hearing.

All spatial

implications

are mentally

conditioned by

the environment

and experience

of the viewer.

Vision is experienced thorugh the eyes, but interpreted with the mind. Perception involves the whole pattern of nerve and brain response as well as the visual 'stimulus'.

perception of Objects

Objects can be perceived not only visually but by the sound of familiar voices, people can be recognized. In identifying objects, they may be touched and weighed in hand. If they are food objects, they maybe smelt and tasted. Thus, the observer may continue examining the object and placing together the various sensory impressions until he as made up his mind what it is.

Ambiguous Figure

Ambiguous figure ground effects an ambigous drawing that can be seen either as a pretty young woman or as an attractive old woman. The old womans eyes is the ear of the young woman.

The separation of two lines placed end to end can be perceived more readily than the separtion of 2 lines placed side by side.

Acuity increases with increase in intensity of illumination.

VISUAL ACUITY & PERCEPTION

by Valera, Sabusap & Valdevieso