Task Descriptions

The following tasks are available in the MultiTaskBattery. Each task entry shows its description, recorded behavioral metrics, available conditions, and reference where applicable.

Action observation

Summary:

Watch a video where the first half a knot is tied, second half a 360 view of the knot is shown.

Details:

Participants watch videos of knots being tied (action condition) and 360-degree views of completed knots (knot condition). The first trial in a block shows the knot-tying action, and subsequent trials show the static knot view. No motor response is required. The task is designed to engage action observation.

Recorded metrics:

None

Conditions:

action, knot

Reference:

Cross, E. S., Cohen, N. R., Hamilton, A. F. de C., Ramsey, R., Wolford, G., & Grafton, S. T. (2012). Physical experience leads to enhanced object perception in parietal cortex: Insights from knot tying. Neuropsychologia, 50(14), 3207–3217.

Task file parameters

Parameter	Type	Default	Description
run_number	int	None	Run number, used to select which knot stimulus to show.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	14	Duration of each video trial in seconds.
iti_dur	float	1	Inter-trial interval duration in seconds.

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Action prediction

Summary:

An action video is shown where an actor is either taking a penalty shot or greeting a person, participants must predict if the ball lands left or right or if the person greets with a handshake or hug.

Details:

Participants watch short video clips of either soccer kicks or greeting interactions that are occluded partway through. They must predict the outcome. The task engages action-prediction and social-perception regions.

Recorded metrics:

Accuracy + RT

Conditions:

soccer, greeting

Reference:

King, M. (2022). Investigating cortico-cerebellar contributions to cognition. UC Berkeley. ProQuest ID: King_berkeley_0028E_21350. Merritt ID: ark:/13030/m5wb6kvd. Retrieved from https://escholarship.org/uc/item/61w6t6sk

Task file parameters

Parameter	Type	Default	Description
hand	str	right	Hand used for response (‘right’ or ‘left’).
responses	list	[1, 2]	Response keys for the two prediction options.
run_number	int	None	Run number, used to select which stimuli to present.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	5	Duration of the video presentation in seconds.
iti_dur	float	1	Inter-trial interval duration in seconds.
question_dur	float	4	Duration the prediction question is displayed in seconds.
condition	str	None	If set, only trials of this condition are included (e.g. ‘soccer_easy’, ‘greeting_hard’).

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Affective

Summary:

2 choice is the image pleasant or unpleasant

Recorded metrics:

Accuracy + RT

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Auditory narrative

Summary:

30 second snippets of a moth radiohour story (wheretheressmoke)

Details:

Participants listen to 30-second audio snippets from The Moth Radio Hour story ‘Where There’s Smoke’. The clips are presented sequentially across runs so the participant follows the narrative. The task is designed to engage auditory cortex and the language network.

Recorded metrics:

None

Task file parameters

Parameter	Type	Default	Description
run_number	int	None	Run number, used to select which audio clip to play.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	30	Duration of each audio clip in seconds.
iti_dur	float	0	Inter-trial interval duration in seconds.

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Degraded passage

Summary:

Listen to muffled passages.

Details:

Participants listen to acoustically degraded (muffled) speech passages. The degradation makes the passages unintelligible, serving as a control for the intact passage condition. The task is designed to engage auditory processing regions without engaging higher-level language comprehension.

Recorded metrics:

None

Reference:

Scott, T. L., Gallee, J., & Fedorenko, E. (2017). A new fun and robust version of an fMRI localizer for the frontotemporal language system. Cognitive Neuroscience, 8(3), 167�176.

Task file parameters

Parameter	Type	Default	Description
run_number	int	None	Run number, used to select which passage to play.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	14.5	Duration of each passage in seconds.
iti_dur	float	0.5	Inter-trial interval duration in seconds.

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Demand grid

Summary:

2AFC, a set of grids is shown one by one on the screen with certain boxes colored blue. After the sequnece, two options are given for the combination of blue boxes across shown grids

Details:

On each trial, a sequence of steps is shown, where each step lights up a set of boxes in a grid. participants need to mentally add these steps together to build up a representation of the final pattern. After the sequence, two grids are displayed side by side: one showing the integrated pattern and one with a modified step. The participant presses left or right to indicate which grid matches the original sequence. The task is designed to tap spatial working memory and engage domain-general processing. The size of the grid, the number of steps and the number of boxes per step can be manipulated to adjust task difficulty and working memory load.

Recorded metrics:

Accuracy + RT

Reference:

Fedorenko, E., Duncan, J., & Kanwisher, N. (2013). Broad domain generality in focal regions of frontal and parietal cortex. Proceedings of the National Academy of Sciences of the United States of America, 110(41), 16616�16621.

Task file parameters

Parameter	Type	Default	Description
hand	str	right	Hand used for response (‘right’ or ‘left’).
responses	list	[1, 2]	Response keys for left and right choices.
grid_size	tuple	(3, 4)	Size of the grid (rows, cols).
num_steps	int	3	Number of steps in the sequence shown to the participant.
num_boxes_lit	int	2	Number of boxes lit up per step.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	7	Duration of each trial in seconds.
question_dur	float	3	Duration of the question phase where the two options are shown.
sequence_dur	float	4	Duration of the sequence presentation phase.
iti_dur	float	0.5	Inter-trial interval duration in seconds.

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Faux pas

Summary:

Stories of (potential) faux pas situations, participants must answer questions about the interaction.

Details:

On each trial a short social scenario is presented followed by a yes/no question about whether anyone said something they should not have said. The task is designed to engage social cognition and mentalizing regions.

Recorded metrics:

Accuracy + RT

Conditions:

social, control

Reference:

Stone, V.E., Baron-Cohen, S. & Knight, R.T. (1998). Frontal lobe contributions to theory of mind. Journal of Cognitive Neuroscience, 10, 640-656. Gregory, C. , Lough, S., Stone, V.E., Erzinclioglu, S., Martin, L., Baron-Cohen, S. & Hodges, J. (2002). Theory of mind in frontotemporal dementia and Alzheimer’s disease: Theoretical and practical implications. Brain, 125, 752-64.

Task file parameters

Parameter	Type	Default	Description
hand	str	right	Hand used for response (‘right’ or ‘left’).
responses	list	[1, 2]	Response keys: 1 = Yes, 2 = No.
run_number	int	None	Run number, used to select which stories to present.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	14	Total duration of each trial in seconds.
iti_dur	float	1	Inter-trial interval duration in seconds.
story_dur	float	10	Duration the story text is displayed in seconds.
question1_dur	float	4	Duration the faux-pas detection question is displayed in seconds.
text_height	float	1.25	Height of the story and question text in degrees of visual angle.
condition	str	None	If set, only trials of this condition are included (‘social’ or ‘control’).

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Finger rhythmic

Summary:

Assess the precision of internal timing mechanisms through a rhythmic tapping production task. Participants are instructed to produce a regular series of taps at a prescribed target interval.

Details:

A timing production task in which participants listen to a train of auditory tones and tap along at the same pace. The task engages motor timing and cerebellar regions.

Conditions:

self-paced tapping

Reference:

Ivry, R. B., & Keele, S. W. (1989). Timing Functions of the Cerebellum. Journal of Cognitive Neuroscience, 1(2), 136-152.

Task file parameters

Parameter	Type	Default	Description
hand	str	right	Hand used for response (‘right’ or ‘left’).
responses	list	[1]	Response key for tapping.
task_dur	float	70	Total task duration in seconds.
trial_dur	float	35	Duration of each trial (includes start text, tone train, and buffer) in seconds.
iti_dur	float	0	Inter-trial interval duration in seconds.
ioi	float or list	0.6	Inter-onset interval(s) in seconds. A single value gives one pace; a list (e.g. [0.3, 0.6, 1.2]) creates trials at different paces, randomly assigned.

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Finger sequence

Summary:

Press a sequence of buttons.

Details:

A sequence of 6 digits (1-4) is displayed and participants press the corresponding buttons in order as quickly and accurately as possible. No consecutive repeats appear in the sequence.

Recorded metrics:

Accuracy + RT

Task file parameters

Parameter	Type	Default	Description
hand	str	bimanual	Hand used for response.
responses	list	[1, 2, 3, 4]	Response keys mapped to each finger.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	3.25	Duration of each trial in seconds.
iti_dur	float	0.5	Inter-trial interval duration in seconds.

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Flexion extension

Summary:

Alternating periods of flexing/extending toes.

Details:

Participants alternate between flexing and extending their toes, guided by visual cues.

Recorded metrics:

None

Task file parameters

Parameter	Type	Default	Description
task_dur	float	30	Total task duration in seconds.
trial_dur	float	30	Duration of the flexion/extension period in seconds.
stim_dur	float	2	Duration of each flex/extend cue in seconds.
iti_dur	float	0	Inter-trial interval duration in seconds.

---

Frith happe

Summary:

Video clips of triangle animations, participants must determine whether interaction was random, goal-directed or a mentalizing interaction.

Recorded metrics:

Accuracy + RT

Conditions:

random, gd, tom

Reference:

Livingston, L.A. et al. (2021) ‘Further developing the Frith–Happé animations: A quicker, more objective, and web-based test of theory of mind for autistic and neurotypical adults’, Autism Research, 14(9), pp. 1905–1912. Available at: https://doi.org/10.1002/aur.2575..

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Intact passage

Summary:

Listen to normal sentences.

Details:

Participants listen to normal, intelligible speech passages. Paired with the degraded passage condition, this allows isolation of higher-level language comprehension from basic auditory processing.

Recorded metrics:

None

Reference:

Scott, T. L., Gallee, J., & Fedorenko, E. (2017). A new fun and robust version of an fMRI localizer for the frontotemporal language system. Cognitive Neuroscience, 8(3), 167�176.

Task file parameters

Parameter	Type	Default	Description
run_number	int	None	Run number, used to select which passage to play.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	14.5	Duration of each passage in seconds.
iti_dur	float	0.5	Inter-trial interval duration in seconds.

---

Liking

Summary:

Video clips of people interacting, participants must determine if the interaction was positive or negative.

Recorded metrics:

Accuracy + RT

Conditions:

like, dislike

Reference:

Heerey, E.A. and Gilder, T.S.E. (2019) ‘The subjective value of a smile alters social behaviour’, PLoS ONE, 14(12), pp. 1–19. Available at: https://doi.org/10.1371/journal.pone.0225284.

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Movie

Summary:

30s clips of planet earth documentary or of a pixar movie, no audio no subtitles

Details:

Participants passively watch 30-second video clips without audio or subtitles. Conditions include romance clips from Pixar’s Up, nature clips, and landscape clips. Each run presents one clip from the selected condition. The Movie clips are usually shown in sequence across runs, so participant can follow a consistent narrative across runs. The task requires no motor response and is designed to engage visual processing and social/emotional processes depending on the condition.

Recorded metrics:

None

Conditions:

romance, landscape, nature

Reference:

Planet Earth and Pixar UP” movie as used in King, M. et al. (2019) ‘Functional boundaries in the human cerebellum revealed by a multi-domain task battery’, Nature Neuroscience, 22(8), pp. 1371–1378. Available at: https://doi.org/10.1038/s41593-019-0436-x.

Task file parameters

Parameter	Type	Default	Description
run_number	int	None	Run number, used to select which clip to show from the stimulus list.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	30	Duration of each trial (clip) in seconds.
iti_dur	float	0	Inter-trial interval duration in seconds.
condition	str	None	Which condition to use: ‘romance’, ‘nature’, or ‘landscape’. If None, all non-practice clips are used.

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N back

Summary:

2AFC, is the current stimulus the same as the one presented n ago

Details:

A 2-back working memory task. Participants view a sequence of images and must indicate whether the current image matches the one shown two items ago. The task engages working memory networks.

Recorded metrics:

Accuracy + RT

Task file parameters

Parameter	Type	Default	Description
hand	str	right	Hand used for response.
responses	list	[1, 2]	Response keys for match and no-match.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	2	Duration each stimulus is displayed in seconds.
iti_dur	float	0.5	Inter-trial interval duration in seconds.
picture_scale	float	1.0	Scaling factor for stimulus images. Values > 1 enlarge the pictures.
stim	list	[‘9.jpg’, ‘11.jpg’, ‘18.jpg’, ‘28.jpg’]	List of stimulus image filenames to draw from.

---

Nonword reading

Summary:

Read nonwords, nonwords presented sequentially one at a time. Press a button at the end of each list of nonwords.

Details:

Pronounceable nonwords are presented one at a time. Participants read each nonword silently and press a button when a hand-press image appears at the end of the list. Serves as a control for sentence reading, isolating low-level visual and phonological processing from sentence-level comprehension.

Recorded metrics:

RT

Reference:

Fedorenko, E., Hsieh, P.-J., Nieto-Castanon, A., Whitfield-Gabrieli, S., & Kanwisher, N. (2010). New method for fMRI investigations of language: defining ROIs functionally in individual subjects. Journal of Neurophysiology, 104(2), 1177�1194.

Task file parameters

Parameter	Type	Default	Description
run_number	int	None	Run number, used to select which nonwords to show.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	5.8	Duration of each nonword list presentation in seconds.
iti_dur	float	0.2	Inter-trial interval duration in seconds.

---

Oddball

Summary:

Black or red “K” or “O” is shown on the screen. Press a button when red “K” is shown

Details:

A rapid visual oddball detection task. On each trial a letter (‘K’ or ‘O’) is briefly shown in either black or red. Participants must press a button when they see a red ‘K’ (the target) and withhold responses to all other stimuli. The task is designed to engage attention and executive control .

Recorded metrics:

Accuracy + RT

Reference:

Du, J., DiNicola, L. M., Angeli, P. A., Saadon-Grosman, N., Sun, W., Kaiser, S., … & Buckner, R. L. (2024). Organization of the human cerebral cortex estimated within individuals: networks, global topography, and function. Journal of neurophysiology, 131(6), 1014-1082.

Task file parameters

Parameter	Type	Default	Description
hand	str	right	Hand used for response (‘right’ or ‘left’).
responses	list	[1, 2]	Response keys.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	0.15	Duration the stimulus is displayed in seconds.
iti_dur	float	0.85	Inter-trial interval duration in seconds.

---

Picture sequence

Summary:

4 cartoon pictures are presented, participants must order them chronologically.

Recorded metrics:

Accuracy + RT

Conditions:

fbelief, tbelief, control, sscript, mechanical

Reference:

Heleven, E., van Dun, K. and Van Overwalle, F. (2019) ‘The posterior Cerebellum is involved in constructing Social Action Sequences: An fMRI Study’, Scientific Reports, 9(1), pp. 1–11. Available at: https://doi.org/10.1038/s41598-019-46962-7.

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Pong

Summary:

Classic pong game. A ball moves across the screen downwards and the participant uses buttons to move a paddle left or right to catch it.

Recorded metrics:

Accuracy

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Rest

Summary:

Lie in scanner with a fixation cross.

Details:

Participants lie still and fixate on a central crosshair. No stimuli are presented and no response is required. For most fMRI experiments, rest is used as the baseline condition, and it is recommended to include it into every task battery to allow for alignment with other datasets.

Recorded metrics:

None

Task file parameters

Parameter	Type	Default	Description
task_dur	float	30	Total rest duration in seconds.

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Rmet

Summary:

Pictures of faces with different emotions presented (eyes only) along with four attribute words, participants must identify which attribute describes person best.

Details:

The Reading the Mind in the Eyes Test. On each trial a photograph of a person’s eye region is shown together with four response options. Participants select which word best describes the mental state shown.

Recorded metrics:

Accuracy + RT

Conditions:

age, emotion

Reference:

Kim, H.A. et al. (2024) ‘Multiracial Reading the Mind in the Eyes Test (MRMET): An inclusive version of an influential measure’, Behavior Research Methods. Revised from Baron-Cohen, Wheelwright, Hill, Raste, & Plumb, 2001

Task file parameters

Parameter	Type	Default	Description
hand	str	right	Hand used for response (‘right’ or ‘left’).
responses	list	[1, 2, 3, 4]	Response keys mapped to the four options.
run_number	int	None	Run number, used to select which stimuli to present.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	6	Duration each stimulus is displayed in seconds.
iti_dur	float	1.5	Inter-trial interval duration in seconds.
option_text_height	float	1.2	Height of the answer-option text in degrees of visual angle.
option_position_scale	float	1.0	Spatial scaling factor for option positions. Values < 1 bring options closer together.
condition	str	None	If set, only trials of this condition are included (‘emotion’ or ‘age’).

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Semantic prediction

Summary:

Sentence presented, participants decide if last word makes sense.

Details:

On each trial a sentence stem is displayed and participants must decide whether the final word makes the sentence meaningful or meaningless. The task engages language comprehension and semantic processing regions.

Recorded metrics:

Accuracy + RT

Task file parameters

Parameter	Type	Default	Description
hand	str	right	Hand used for response (‘right’ or ‘left’).
responses	list	[1, 2]	Response keys: 1 = meaningful, 2 = meaningless.
run_number	int	None	Run number, used to select which sentences to present.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	15	Duration of each trial in seconds.
sentence_dur	float	2	Duration the sentence stem is displayed before the final word appears, in seconds.

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Semantic switching

Summary:

sentence presented, participants decide if last word makes sense.

Recorded metrics:

Accuracy + RT

Conditions:

predictable, switched, meaningless

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Sensmot control

Summary:

Assess basic sensorimotor control. Measure reaction time and response accuracy to evaluate low-level perceptual and motor processing. Part 1 is a Go/No-Go. Part 2 is a 2AFC

Recorded metrics:

Accuracy + RT

Conditions:

Go/No-Go 2AFC.

Reference:

: Koechlin, E., & Summerfield, C. (2007). An information theoretical approach to prefrontal executive function. Trends in cognitive sciences, 11(6), 229-235.Koechlin 2007

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Sentence reading

Summary:

Read sentences, words presented sequentially one at a time. Press a button at the end of each sentence.

Details:

Words from English sentences are presented one at a time. Participants read each word silently and press a button when a hand-press image appears at the end of the sentence. Paired with nonword reading, this isolates sentence-level language processing.

Recorded metrics:

RT

Reference:

Fedorenko, E., Hsieh, P.-J., Nieto-Castanon, A., Whitfield-Gabrieli, S., & Kanwisher, N. (2010). New method for fMRI investigations of language: defining ROIs functionally in individual subjects. Journal of Neurophysiology, 104(2), 1177-1194.

Task file parameters

Parameter	Type	Default	Description
run_number	int	None	Run number, used to select which sentences to show.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	5.8	Duration of each sentence presentation in seconds.
iti_dur	float	0.2	Inter-trial interval duration in seconds.

---

Serial reaction time

Summary:

Single boxes light up one at a time in a row of four. Press corrosponding button as fast as possible.

Details:

Four boxes are displayed in a row. On each trial one box lights up green and the participant presses the corresponding button as fast as possible. Stimuli are randomized with the constraint that the same box never lights up on consecutive trials. The task measures basic visuomotor response speed.

Recorded metrics:

RT

Task file parameters

Parameter	Type	Default	Description
hand	str	bimanual	Hand used for response.
responses	list	[1, 2, 3, 4]	Response keys mapped to each box position.
task_dur	float	30	Total task duration in seconds.
initial_wait	float	1.0	Wait time in seconds before the first stimulus, showing empty boxes.
trial_dur	float	0.5	Duration the green box is displayed in seconds.
iti_dur	float	1.0	Inter-trial interval duration in seconds.

---

Spatial navigation

Summary:

Imagining walking room to room in childhood home.

Details:

Participants imagine walking from room to room in their childhood home. No visual stimuli are presented beyond the instruction. The task is designed to engage spatial memory and mental navigation.

Recorded metrics:

None

Task file parameters

Parameter	Type	Default	Description
task_dur	float	30	Total task duration in seconds.
trial_dur	float	30	Duration of the imagination period in seconds.
iti_dur	float	0	Inter-trial interval duration in seconds.

---

Story sequence

Summary:

4 sentences are presented, participants must order them chronologically.

Recorded metrics:

Accuracy + RT

Conditions:

fbelief, tbelief, control, sscript, mechanical

Reference:

Heleven, E., van Dun, K. and Van Overwalle, F. (2019) ‘The posterior Cerebellum is involved in constructing Social Action Sequences: An fMRI Study’, Scientific Reports, 9(1), pp. 1–11. Available at: https://doi.org/10.1038/s41598-019-46962-7.

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Strange stories

Summary:

Clips of relationship stories, participants are asked to answer questions about the interaction.

Recorded metrics:

Accuracy + RT

Conditions:

social, control

Reference:

Murray, K. et al. (2017) ‘A new test of advanced theory of mind: The “Strange Stories Film Task” captures social processing differences in adults with autism spectrum disorders’, Autism Research, 10(6), pp. 1120–1132. Available at: https://doi.org/10.1002/aur.1744.

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Theory of mind

Summary:

Short story presented with a question at the end, participants must answer the question.

Details:

Participants read a short story followed by a true/false question. In the belief condition, stories involve understanding another person’s mental state (false beliefs, intentions). In the photo condition, stories involve factual reasoning about outdated photographs. The task is designed to engage mentalizing processes and social cognition.

Recorded metrics:

Accuracy + RT

Conditions:

belief, photo

Reference:

Saxe, R. and Kanwisher, N. (2003) ‘People thinking about thinking people: The role of the temporo-parietal junction in “theory of mind”’, NeuroImage, 19(4), pp. 1835–1842. Available at: https://doi.org/10.1016/S1053-8119(03)00230-1.

Task file parameters

Parameter	Type	Default	Description
hand	str	right	Hand used for response.
responses	list	[1, 2]	Response keys for True and False.
run_number	int	None	Run number, used to select stimuli.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	14	Duration of each trial in seconds.
story_dur	float	10	Duration the story is displayed in seconds.
question_dur	float	4	Duration the question is displayed in seconds.
iti_dur	float	1	Inter-trial interval duration in seconds.
condition	str	None	Which condition to use: belief or photo.
text_height	float	1.25	Height of the story and question text in degrees of visual angle.

---

Time perception

Summary:

Assess the precision of internal timing mechanisms by measuring participants’ perceptual acuity in discriminating short auditory intervals. Participants are presented with sequences of tones and must decide whether a comparison interval is longer or shorter than a standard reference interval.

Recorded metrics:

Accuracy + RT

Conditions:

time interval

Reference:

Ivry, R. B., & Keele, S. W. (1989). Timing Functions of the Cerebellum. Journal of Cognitive Neuroscience, 1(2), 136–152.

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Tongue movement

Summary:

Move tongue from right to left, touching upper premolar teeth guided by a flashing black circle around a fixation crosshair. Black circle means right, no circle means left, 1s periods.

Details:

Participants move their tongue from right to left, touching their upper premolar teeth on each side. A flashing black circle around a fixation crosshair guides the rhythm (1-second periods). The task is designed to activate somatomotor tongue representations.

Recorded metrics:

None

Reference:

A Third Somatomotor Representation in the Human Cerebellum (Bucknet et al., 2022)

Task file parameters

Parameter	Type	Default	Description
task_dur	float	30	Total task duration in seconds.
trial_dur	float	1	Duration of each tongue movement cycle in seconds.
iti_dur	float	0	Inter-trial interval duration in seconds.

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Verb generation

Summary:

Words presented, participants read the words. At halfpoint, “GENERATE” is shown, participants need to covertly generate verbs associated with words

Details:

Words are presented one at a time. In the first half of trials (read condition), participants silently read each word. In the second half (generate condition), a ‘GENERATE’ cue appears and participants covertly generate a verb associated with each presented word. The task is designed to engage the language prcoessing.

Recorded metrics:

None

Conditions:

generate, read

Task file parameters

Parameter	Type	Default	Description
task_dur	float	30	Total task duration in seconds.
trial_dur	float	2	Duration each word is displayed in seconds.
iti_dur	float	0.5	Inter-trial interval duration in seconds.

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Visual search

Summary:

Geometric shapes presented on screen, participants must identify if ‘L’ is present.

Details:

Participants view a display of geometric shapes at different rotations (90, 180, 270, 360 degrees) and must determine whether the target shape (at 90 degrees) is present. On easy trials 4 shapes are shown, on hard trials 8 shapes are shown. Participants press one button if the target is present and another if it is absent. The task is designed to engage selective visual attention and eye-movement control.

Recorded metrics:

Accuracy + RT

Task file parameters

Parameter	Type	Default	Description
hand	str	right	Hand used for response (‘right’ or ‘left’).
responses	list	[1, 2]	Response keys for target present and absent.
task_dur	float	30	Total task duration in seconds.
trial_dur	float	2	Duration of each trial in seconds.
iti_dur	float	0.5	Inter-trial interval duration in seconds.
easy_prob	float	0.5	Probability of an easy trial (4 stimuli vs. 8).

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