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。

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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.

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。

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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.

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。

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