Stroop Task

Field	Value
Name	Stroop Task
Version	v1.1.2
URL / Repository	https://github.com/TaskBeacon/T000014-stroop
Short Description	Classic color-word Stroop task measuring interference control (congruent vs incongruent trials).
Created By	Zhipeng Cao (zhipeng30@foxmail.com)
Date Updated	2026-03-02
PsyFlow Version	0.1.9
PsychoPy Version	2025.1.1
Modality	Behavior / EEG
Language	Chinese
Voice Name	zh-CN-YunyangNeural

Run Modes

• Human (default): python main.py
• QA: python main.py qa --config config/config_qa.yaml
• Scripted Sim: python main.py sim --config config/config_scripted_sim.yaml
• Sampler Sim: python main.py sim --config config/config_sampler_sim.yaml

1. Task Overview

This Stroop implementation presents Chinese color words in either congruent or incongruent ink colors. Participants respond to ink color while ignoring word meaning. The key outcomes are reaction time and accuracy differences between congruent and incongruent conditions.

2. Task Flow

Block-Level Flow

Step	Description
Setup	Load config, initialize mode context (human/qa/sim), open PsychoPy window, load stimuli, initialize trigger runtime.
Instruction	Show task instructions (instruction_text; optional voice in human mode).
Block Loop	Generate conditions and run trial loop via BlockUnit.run_trial(...).
Block Summary	Compute block accuracy and show block_break screen.
Finalize	Show good_bye, send exp_end, save CSV, close trigger runtime, quit PsychoPy.

Trial-Level Flow

Step	Description
Fixation	Show fixation cross (+) for fixation_duration.
Stroop Response	Show one condition stimulus (congruent_* / incongruent_*) and capture response within stim_duration.
Feedback	Show correct_feedback, incorrect_feedback, or no_response_feedback.
ITI	Blank interval sampled from iti_duration.

Controller Logic

No adaptive controller is used in this baseline Stroop variant.

3. Configuration Summary

a. Subject Info

Field	Meaning
subject_id	Participant ID (3 digits).
subname	Participant name (pinyin).
age	Age (5-60).
gender	Male or Female.

b. Window Settings

Parameter	Value
window.size	[1920, 1080]
window.units	deg
window.fullscreen	true
window.bg_color	gray
window.monitor_width_cm	60
window.monitor_distance_cm	72

c. Stimuli

Name	Type	Description
fixation	text	Central + fixation.
congruent_red	text	Character "红" in red.
congruent_green	text	Character "绿" in green.
incongruent_red	text	Character "绿" in red.
incongruent_green	text	Character "红" in green.
correct_feedback	text	Correct response message.
incorrect_feedback	text	Incorrect response message.
no_response_feedback	text	No-response message.
instruction_text	textbox	Chinese task instructions.
block_break	text	Block transition with accuracy summary.
good_bye	text	End-of-task message.

d. Timing

Phase	Duration
fixation_duration	0.5 s
stim_duration	2.0 s
feedback_duration	0.5 s
iti_duration	Random in [0.8, 1.2] s

e. Triggers

Event	Code
exp_onset	98
exp_end	99
block_onset	100
block_end	101
fixation_onset	1
congruent_stim_onset	10
incongruent_stim_onset	20
red_key_press	30
green_key_press	31
feedback_correct_response	51
feedback_incorrect_response	52
feedback_no_response	53

4. Methods (for academic publication)

Participants performed a computerized Stroop color-word task. Each trial started with a fixation cross, followed by a single Chinese color word rendered in either congruent or incongruent ink color. Participants were instructed to respond to the ink color (red vs green) while ignoring lexical meaning.

Stimuli remained on screen for up to 2 seconds or until response, followed by brief trial-wise feedback and a jittered inter-trial interval. The design included both congruent and incongruent trials within each block, enabling estimation of classical Stroop interference through reaction-time and accuracy contrasts.

The task is implemented for behavioral and EEG-compatible runs with explicit trigger coding for experiment boundaries, stimulus onset class, response channel, and feedback outcome.