When adaptation to a grating takes place certain responses are measured. Adapting or inhibiting certain cells that are tuned in to particular aspects, such as contrast, will show up in a further test after the adaptation has taken place. This can be seen as an altered perception, or detection threshold in gratings. In looking at a grating for an amount of time, contrast threshold is temporarily elevated for detecting another grating similar in orientation and spatial frequency. The threshold elevation can also be used to investigate orientation sensitive channels in the visual system, contrast is orientation specific for the frequency that has been adapted to. In an adaptation experiment to sine wave gratings for 60 seconds, orientation of the grating was varied between 0 and 40 degrees, contrast remained the same. Orientations between 10 and 20 degrees of the original position had an effect shown in an elevated contrast threshold. (Beaton and Blakemore 1981)