Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com), Millisecond
Created: January 09, 2023
Last Modified: January 02, 2025 by K. Borchert (katjab@millisecond.com), Millisecond
Script Copyright © Millisecond Software, LLC
This script implements Millisecond's computerized version of the Modified Camel and Cactus Test (mCCT) developed by Moore et al (2022) on behalf of the Genetic FTD Initiative (GENFI) as a short alternative to the original Camel and Cactus Test (CCT) by Bozeat et al (2000). The mCCT is a test of semantic memory independent of language.
Moore, K et al (2022). A modified Camel and Cactus Test detects presymptomatic semantic impairment in genetic frontotemporal dementia within the GENFI cohort. APPLIED NEUROPSYCHOLOGY: ADULT 2022, VOL. 29, NO. 1, 112–119 https://doi.org/10.1080/23279095.2020.1716357 complete paper and pencil test is published in the supplementay materials
Bozeat, S., Lambon Ralph, M. A., Patterson, K., Garrard, P., & Hodges, J. R. (2000). Non-verbal semantic impairment in semantic dementia. Neuropsychologia, 38(9), 1207–1215. doi:10.1016/S0028-3932(00)00034-8
5 minutes
Participants see 1 target item on top of the screen and 4 comparison items on the bottom. They are asked to find the comparison item that goes best with the target item. In this script, participants can correct their responses until they press button 'Next'. There are 3 practice trials and a total of 32 (fixed) test trials.
1. Practice: 3 trials
- 3 practice trials with feedback (by default feedback is presented for 5s)
- items are presented in fixed order
2. Test: 32 trials
- 33 test trials without feedback
- items are presented in fixed order
All items were taken from the supplementary document of Moore et al (2022).
Separate image files were prepared for each target and comparison items
and stored as 800x800px images.
provided by Millisecond - can be edited in script 'mcct.iqjs' (instructions are language dependent)
Instructions were based on instructions in the paper and pencil version but adapted by
Millisecond for computer use.
File Name: mcct_summary*.iqdat
| Name | Description |
|---|---|
| inquisit.version | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| computer.touch | 0 = device has no touchscreen capabilities; 1 = device has touchscreen capabilities |
| computer.hasKeyboard | 0 = no external keyboard detected; 1 = external keyboard detected |
| startDate | Date the session was run |
| startTime | Time the session was run |
| subjectId | Participant ID |
| groupId | Group number |
| sessionId | Session number |
| elapsedTime | Session duration in ms |
| completed | 0 = Test was not completed 1 = Test was completed |
| mCCTScore | Final number of correctly selected items mCCT > 27 considered normal mCCT = 27 considered borderline mCCT < 27 considered abnormal (see Moore et al, 2022, p.115) |
| meanCorrRT | Mean submit response time (in ms) for correctly selected items |
File Name: mcct_raw*.iqdat
| Name | Description |
|---|---|
| build | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| computer.touch | 0 = device has no touchscreen capabilities; 1 = device has touchscreen capabilities |
| computer.hasKeyboard | 0 = no external keyboard detected; 1 = external keyboard detected |
| date | Date the session was run |
| time | Time the session was run |
| subject | Participant ID |
| group | Group number |
| session | Session number |
| blockcode | The name the current block (built-in Inquisit variable) |
| blocknum | The number of the current block (built-in Inquisit variable) |
| trialcode | The name of the currently recorded trial (built-in Inquisit variable) |
| trialnum | The number of the currently recorded trial (built-in Inquisit variable) trialnum is a built-in Inquisit variable; it counts all trials run even those that do not store data to the data file. |
| trialCounter | Tracks the number of problems run |
| itemNumber | The itemnumber of the currently presented problem |
| response | The selected image/button of the current trial |
| values.rsp | The number (1-4) of the currently selected image 1 = top, left; 2 = top, right 3 = bottom, left; 4 = bottom, right |
| correctRsp | The image number of the current correct response |
| correct | 1 = the selected response (rsp) is the same as the correctRsp 0 = otherwise participants can change their selection until they press 'submit' |
| countCorrect | The cumulative number of correct selections (established when participants press 'submit') |
| latency | Response latency (in ms) of the current trial; measured from: onset of trial |
| rtSubmit | The cumulative latency (in ms) until submit-button is pressed |
The procedure can be adjusted by setting the following parameters.
| Name | Description | Default |
|---|---|---|
Timing Parameters |
||
| practiceFeedbackDurationMS | The duration (in ms) of the practice feedback trial | 5000 |