When sets of disks with tangential greylevel gradients are arranged in concentric circles (see image above, most observers perceive these disks moving around the centre, similar to Kitaoka’s ‘snake illusion’. This motion illusion is enhanced for large-scale and bright images and depends to a large extent to dynamic changes in the stimulus such as elicited by involuntary eye movements or blinks – fixating the centre of the pattern does abolish the illusion, whereas scanning the picture the motion sensation. A reliably effective version of this illusion, which does not require eye movements (i.e. persists when observers fixate the target in the centre of the image), can be generated by modulating the background luminance of the array of disks . This stimulus offers the opportunity of studying this motion illusion – the percept of spinning disks in the absence of any physical displacement – in a highly controlled manner in psychophysical and physiological experiments, because it is not depending on involuntary eye movements or eye blinks. Work in preparation (Zanker 2005) will demonstrate how this illusion can be explained in terms of a two-dimensional motion detector network
Archive for 07/01/2010 - 08/01/2010
Can you spot the old man in this picture? there are several human bodies combined to create the picture of an old man. let me know how many find them.
Spot the person in this picture, is it male or female or both are shown in the picture below?
Ear tattoos are becoming a popular trend, especially with women today since you can cover them if you have long hair and there just isn't a huge area to be worked on so it is a pretty fast process compared to other areas of the body