10.85. Three-dimensional intradimensional/extradimensional set-shifting task (IDED3D)

10.85.1. Source

From Rogers RD et al. (1999), Psychopharmacology 146: 482, PMID https://www.pubmed.gov/10550499.

10.85.2. Intellectual property rights

  • De novo task code; part of the CamCOPS intellectual property.

  • Some stimuli redrawn from original task (by RD Rogers, University of Cambridge, 1995-1999).

10.85.3. Settings

When assigning this task to a patient as part of a task schedule, the task may be configured with the following JSON settings. For example:

{
    "ided3d": {
        "last_stage": 8,
        "max_trials_per_stage": 50,
        "progress_criterion_x": 6,
        "progress_criterion_y": 6,
        "min_number": 1,
        "max_number": 9,
        "pause_after_beep_ms": 500,
        "iti_ms": 500,
        "counterbalance_dimensions": 4,
        "volume": 0.5,
        "offer_abort": false
    }
}

Here is a description of each setting:

last_stage

Last stage to use (1 [SD] – 8 [EDR]). Default 8.

The stages are:

  1. simple discrimination (SD)

  2. reversal of previous SD stage (SDr)

  3. compound discrimination (CD)

  4. reversal of previous CD stage (CDr)

  5. intradimensional shift (ID)

  6. reversal of previous ID stage (IDr)

  7. extradimensional shift (ED)

  8. reversal of previous ED stage (EDr)

max_trials_per_stage

Maximum number of trials per stage (abort if this reached without success). Default 50.

progress_criterion_x

Criterion to proceed to next stage: X correct out of the last Y trials, where this is X. Default 6.

progress_criterion_y

Criterion to proceed to next stage: X correct out of the last Y trials, where this is Y. Default 6.

min_number

Minimum number of stimuli [1–9]. Default 1.

max_number

Maximum number of stimuli [1–9]. Default 9.

pause_after_beep_ms

Time to continue visual feedback after auditory feedback finished (ms). Default 500.

iti_ms

Intertrial interval (ITI) (ms). Default 500.

counterbalance_dimensions

Dimension counterbalancing [0–5]. See Counterbalancing. No default.

volume

Volume [0-1]. Default 0.5

offer_abort

Offer the user an abort button. Default false.

In clinician mode, the user may change these settings before starting the task. In single-user mode, if all of the settings have valid values (as a minimum counterbalance_dimensions must be set), the user will not be able to change these settings and the task will start immediately.

10.85.3.1. Counterbalancing

The counterbalancing options are:

  • Counterbalancing 0: dimensions shape, colour, number

  • Counterbalancing 1: dimensions colour, number, shape

  • Counterbalancing 2: dimensions number, shape, colour

  • Counterbalancing 3: dimensions shape, number, colour

  • Counterbalancing 4: dimensions colour, shape, number

  • Counterbalancing 5: dimensions number, colour, shape

Python code equivalent to the actual code used in IDED3D::makeStages():

poss_dimensions = ["shape", "colour", "number"]
# ... from Exemplars::possibleDimensions()
n_dimensions = len(poss_dimensions)
for cb_dim in range(0, 5 + 1):
    cb1max = n_dimensions
    cb2max = n_dimensions - 1
    cb1 = cb_dim % cb1max
    cb2 = (cb_dim // cb1max) % cb2max
    first_dim_index = cb1
    second_dim_index = (first_dim_index + 1 + cb2) % n_dimensions
    third_dim_index = (first_dim_index + 1 + (cb2max - 1 - cb2)) % n_dimensions
    print(
        f"Counterbalancing {cb_dim}: dimensions "
        f"{poss_dimensions[first_dim_index]}, "
        f"{poss_dimensions[second_dim_index]}, "
        f"{poss_dimensions[third_dim_index]}"
    )