Psychophysics

Introduction

• Psychophysics is basically an interdisciplinary branch of psychology and physics; it studies the relationship between physical stimuli and the sensations along with the perceptions they produce.
• The psychophysicists analyze the perceptual processes by studying the effect on a behavior; further, they also study the systematically varying properties of a stimulus along one or more physical dimensions.

• The concept of psychophysics was first time used in 1860 by Gustav Theodor Fechner in Leipzig, Germany.
• Fechner published his research namely ‘Elemente der Psychophysik’ (i.e. Elements of Psychophysics).

Terms of Psychophysics

• Following are the commonly used terms in psychophysics −
  • Signal detection theory − It explains the interaction of the sensory capabilities and the decision making elements in detecting the stimulus.
  • ‘Ideal observer analysis − It is a technique for investigating i.e. how information has processed in a perceptual system.
  • Difference thresholds − It helps to differentiate two stimuli. This point is termed just-noticeable difference.
  • Absolute threshold − The point at which the person first detects the stimulus strength i.e. presence of stimulus.
  • Scaling − It uses rating scales to allocate relative values.

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Modern Approaches of Psychophysicists

• Modern Psychophysicists research on −
  • Vision
  • Hearing
  • Touch (or sense)
• Based on these, psychophysicists measure what the perceiver’s decision extracts from the stimulus.

Application of Psychophysicists

• In the present world, psychophysics is commonly applied to treat many of psychological problems.