Wikia

Psychology Wiki

Spatial frequency

Talk0
34,141pages on
this wiki

Assessment | Biopsychology | Comparative | Cognitive | Developmental | Language | Individual differences | Personality | Philosophy | Social |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |

Cognitive Psychology: Attention · Decision making · Learning · Judgement · Memory · Motivation · Perception · Reasoning · Thinking  - Cognitive processes Cognition - Outline Index


Spatial frequency is a characteristic of any structure that is periodic across position in space. The spatial frequency is a measure of how often the structure repeats per unit of distance. The SI unit of spatial frequency is cycles per meter.

In wave mechanics, the spatial frequency \nu \ is related to the wavelength  \lambda \ by

\nu \ = \ { 1 \over \lambda }

Likewise, the wave number k is related to spatial frequency and wavelength by

 k \ = \ 2 \pi \nu  \ = \ { 2 \pi  \over \lambda }

Visual perceptionEdit

In the study of visual perception, sinusoidal gratings are frequently used to probe the capabilities of the visual system. In these stimuli, spatial frequency is expressed as the number of cycles per degree of visual angle.
Different spatial frequencies convey different information about the appearance of a stimulus. High spatial frequencies represent abrupt spatial changes in the image, such as edges, and generally correspond to configural information and fine detail. Low spatial frequencies, on the other hand, represent global information about the shape, such as general orientation and proportions.[1] In the general population of adults, the threshold for spatial frequency discrimination is about 7%. It is often poorer in dyslexic individuals [2].

See alsoEdit

ReferencesEdit

  1. Bar M (Aug 2004). Visual objects in context. Nat. Rev. Neurosci. 5 (8): 617–29.
  2. Ben-Yehudah G, Ahissar M (May 2004). Sequential spatial frequency discrimination is consistently impaired among adult dyslexics. Vision Res. 44 (10): 1047–63.
This page uses Creative Commons Licensed content from Wikipedia (view authors).

Around Wikia's network

Random Wiki