| Prior to a ganzfeld session, the experimenter turned on the autoganzfeld equipment. |
| In ganzfeld experiments, subjects place two halves of an ordinary ping-pong ball over their eyes, erasing any visual stimulation. |
| Direct evaluation cannot be done because very few ganzfeld studies have included a control group. |
| One major concern is that the ganzfeld methodology does not in every instance produce significant results. |
| For example, the initial ganzfeld studies obtained significant results with pictures as targets. |
| In the present study, we sought to test this explanation for the apparent decline in ganzfeld effect sizes. |
