| One Touch Stockings of Cambridge is a spatial planning test which gives a measure of frontal lobe function. OTS is a variant of the Stockings of Cambridge test and places greater demands on working memory as the subject has to visualise the solution |
Administration time
Around 10 minutes, depending on level of impairment
Task
As for SOC (Stockings of Cambridge), the subject is shown two displays containing three coloured balls. The displays are presented in such a way that they can easily be perceived as stacks of coloured balls held in stockings or socks suspended from a beam. This arrangement makes the 3-D concepts involved apparent to the subject, and fits with the verbal instructions.
There is a row of numbered boxes along the bottom of the screen. The test administrator first demonstrates to the subject how to use the balls in the lower display to copy the pattern in the upper display, and completes one demonstration problem, where the solution requires one move. The subject must then complete three further problems, one each of 2 moves, 3 moves and 4 moves.
Next the subject is shown further problems, and must work out in their head how many moves the solutions to these problems require, then touch the appropriate box at the bottom of the screen to indicate their response.
Test modes
OTS has four modes, with varying numbers of problems and boxes.
Outcome measures
OTS has 4 outcome measures - problems solved on first choice, mean choices to correct, mean latency to first choice and mean latency to correct. Each of these measures may be calculated for all problems, or for problems with a specified number of moves (1-move to 5 or 6 moves).
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