In one they were told to concentrate simply on the durationof an image, in another they were asked to focus on the colour, and in a third they were asked to concentrate on both duration and colour. .
一次他们被要求专注于图象持续的时间，另一次集中观察图象的色彩，第三次同时关注图象持续的时间和色彩。
2
In one they were told to concentrate simply on the duration of an image, in another they were asked to focus on the colour, and in a third they were asked to concentrate on both duration and colour.