What do you see in the ganzflicker?

A visual flicker is known to induce "Ganzfeld imagery" (Allefeld et al., 2011; Sumich et al., 2018), a type of visual pseudo-hallucination. The continuous flicker facilitates visual imagery, but does not induce any permanent changes in the brain and does not elicit actual hallucinations. For best results, view the Ganzflicker in a dark room, on a desktop/laptop rather than mobile, and listen to the provided white noise over headphones.

10 minutes

50 minutes

The above buttons play continuous white

noise. White noise can be played in combi-

nation with the flicker to enhance Ganzfeld imagery. Listen with headphones for the most immersive experience.

Please fill out a short questionnaire

Whether you saw something or not, I would like to hear from you! Please fill out the questionnaire after you try the Ganzflicker. Your responses will contribute to our growing understanding of individual differences in mental representations and their influence on perception. The questionnaire takes about 10 minutes.


how do you remember sensory information?

In what format do different people represent sensory information? Many studies have shown that people can simulate sensory processing in the absence of a sensory stimulus (Harrison & Tong, 2009; Udale et al., 2018), but other experiments have demonstrated that sensory information can be translated into a completely non-sensory format (Pylyshyn, 1973). In fact, a recent theory suggests that there may be many potential formats for the representation of sensory information (Palmiero et al., 2019) and I hypothesize that a person's dominant format may be driven by individual differences in the ability to simulate information in a sensory way.