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To view all CANTAB tests, click here [open/close]
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Choice
Reaction Time (CRT)
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Overview
Choice Reaction Time (CRT) is a 2-choice reaction
time test which is similar to the Simple
Reaction Time (SRT) test, except that stimulus
and response uncertainty are introduced by having
two possible stimuli and two possible responses.
It is useful for testing general alertness and motor
speed. |
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Administration time
Around 7 minutes, depending on level of impairment.
Task
An arrow-shaped stimulus is displayed on either
the left or the right side of the screen.
The subject must press the left hand button on
the press pad if the stimulus is displayed on
the left hand side of the screen, and the right
hand button on the press pad if the stimulus is
displayed on the right hand side of the screen.
Test modes
Clinical mode.
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Outcome measures
This test has thirteen outcome measures, assessing
correct and incorrect responses, errors of commission
and omission (late and early responses), and latency
(response speed). |
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Match to
Sample Visual Search (MTS)
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Overview
Match to Sample Visual Search (MTS) is a matching
test, with a speed/accuracy trade-off. It is a simultaneous
visual search task with response latency dissociated
from movement time. Efficient performance on this
task requires the ability to search among the targets
and ignore the distractor patterns which have elements
in common with the target. This test can help to
differentiate between Parkinson's disease and Alzheimer's
disease, and also between Lewy Body dementia and
Alzheimer's disease. |
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Administration time
Around 9 minutes, depending on level of impairment
Task
The subject is shown a complex visual pattern
(the sample) in the middle of the screen, and
then, after a brief delay, a varying number of
similar patterns is shown in a circle of boxes
around the edge of the screen. Only one of these
boxes matches the pattern in the centre of the
screen, and the subject must indicate which it
is by touching it. Reaction time is measured on
the basis of the release of the press-pad, which
allows for its more accurate measurement.
Test modes
Clinical mode
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Outcome measures
The twelve outcome measures for SOC cover the number
of problems solved with minimum moves, the mean
number of moves for n-move problems, mean initial
thinking time for n-move problems and mean subsequent
thinking time for n-move problems. |
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Reaction
Time (RTI)
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Overview
Reaction Time (RTI) is a latency task with a comparative
history (the five choice task) and uses a procedure
to separate response latency from movement time.
It is more useful than CRT or SRT where it is necessary
to control for tremor. |
click
for an interactive demonstration
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Administration time
Around 5 minutes, depending on level of impairment.
Task
The task is divided into five stages, which require
increasingly complex chains of responses. In each
case, the subject must react as soon as a yellow
dot appears. In some stages the dot may appear
in one of five locations, and the subject must
sometimes respond by using the press-pad, sometimes
by touching the screen, and sometimes both.
Test modes
Clinical mode, parallel mode and child mode
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Outcome measures
The four outcome measures in RTI are divided into
reaction time (simple and 5-choice) and movement
time (simple and five-choice). |
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Rapid Visual
Information Processing (RVP)
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Overview
Rapid Visual Information Processing (RVP) is a test
of sustained attention (similar to the Continuous
Performance Task) and has proved useful in many
studies in which drugs are used to help develop
a disease model.. It is sensitive to dysfunction
in the parietal and frontal lobe areas of the brain
and is also a sensitive measure of general performance. |
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Administration time
Around seven minutes.
Task
A white box appears in the centre of the computer
screen, inside which digits, from 2 to 9, appear
in a pseudo-random order, at the rate of 100 digits
per minute. Subjects are requested to detect target
sequences of digits (for example, 2-4-6, 3-5-7,
4-6-8) and to register responses using the press
pad.
Test modes
Clinical mode, plus 123 mode (for children aged
4-8) and 357 mode (for children aged 7-14).
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Outcome measures
The nine RVP outcome measures cover latency, probabilities
and sensitivity (calculated using Signal Detection
Theory), and hits, misses, false alarms and rejections.
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Simple
Reaction Time (SRT)
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Overview
Sjmple Reaction Time (SRT) is a test which measures
simple reaction time through delivery of a known
stimulus to a known location to elicit a known response.
The only uncertainty is with regard to when the
stimulus will occur, by having a variable interval
between the trial response and the onset of the
stimulus for the next trial. Like Choice
Reaction Time (CRT) it is useful for testing
general alertness and motor speed, and is often
sensitive to medication effects. |
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Administration time
Around 6 minutes, depending on level of impairment.
Task
As soon as the subject sees the square on the
screen, they must press the button on the press
pad.
Test modes
Clinical mode
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Outcome measures
The eleven outcome measures for SRT cover latency
(response speed), correct responses and errors of
commission and omission. |
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