Some Demonstrations Useful for Studying Perception

Psychophysics

• Weber's law calculations
• A study that allows you to compare Fechner's law and Stevens' power law for the brightness of a light
• Theory of Signal Detection: d' and β calculator with step by step instructions
• Theory of Signal Detection: Areas under noise and signal plus noise distributions
• d' and β calculator

Receptive Fields

• A simulation of the receptive field of a retinal ganglion cell's response to an edge
• A simulation of the receptive field of a retinal ganglion cell's response to various spatial frequencies
• Pixelation and spatial frequencies
• Troxler's fading -- an example of neural adaptation

Color Perception

• A demonstration of hue, saturation and brightness of a color
• A demonstration of subtractive and additive mixtures
• A demonstration of metameric matching
• The univariance principle and metameric matching with one, two or three types of cones
• A demonstration of simultaneous color contrast
• A pair of color "illusions" based on color induction
• A utility for seeing the color of a pixel in an image
• Benham's top and subjective colors
• An activity that simuluates protanopia and deuteranopia
• Color from motion

Form Perception

• The Gestalt principle of common fate
• The Ehrenstein - Orbison illusion
• Form from motion
• Neon color spreading

Depth Perception

• Stereopsis and random dot anaglyphs (red-cyan glasses needed for viewing)
• Make your own anaglyphs (red-cyan glasses needed for viewing)
• A study that allows you to compare different explanations for the Müller-Lyer illusion
• A visual angle calculator and a demonstration of visual angles
• The horizontal-vertical illusion
• Poggendorff's illusion

Motion Perception

• The aperture problem
• The effects of local motion on global motion
• The motion after effect
• The anomalous motion illusion

Audition

• A demonstration that allows you to explore fundamental and harmonic frequencies in notes
• Representations of sound -- the time and frequency domains
• A study that lets you experience the ILD and ITD in auditory lateralization / localization

Miscellaneous

• RSVP -- rapid serial visual presentation

These demonstrations have been tested with Chrome on Windows. Use of other browsers / operating systems may lead to problems.