Stimuli

Faces


A movie of a ‘happy’ face where the neutral face morphs to full happy intensity.

A movie of a ‘happy’ face where the neutral face morphs to full happy intensity.


Gratings and Beat Patterns

Examples of first and second order stimuli can be found here.

If you want to understand more about these moving stimuli then please read:
Derrington, A. M., Allen, H. A. & Delicato, L. S.(2004) Visual Mechanisms of Motion Perception and Analysis. Annual Review of Psychology, 55, 181-205. doi: 10.1146/annurev.psych.55.090902.141903


Stimulus Generation and Presentation

Stimuli are generated using Matlab and Psychtoolbox routines and presented on a gamma corrected CRT monitor (120Hz refresh rate). A bits++ digital video processor effectively increases the resolution of the graphics card to 14bit to allow presentation of low contrast stimuli.

Stereo experiments are conducted using a mirror stereoscope where separate images on the monitor are presented independently to the left and right eyes. Head position is stabilised using a chin rest.



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