Resting-state Task (EC+EO)

Field	Value
Name	Resting state
Version	main
URL / Repository	https://github.com/TaskBeacon/REST
Short Description	EC + EO
Created By	Zhipeng Cao (zhipeng30@foxmail.com)
Date Updated	2025/06/21
PsyFlow Version	0.1.0
PsychoPy Version	2025.1.1
Modality	Behavior/EEG
Language	Chinese
Voice Name	zh-CN-YunyangNeural

1. Task Overview

This task is a resting‐state paradigm with two conditions—eyes closed (EC) and eyes open (EO)—each presented sequentially in a single block. Participants receive general instructions, complete a brief countdown, then experience alternating EC and EO trials of fixed duration without any active response requirements; triggers mark key events for synchronization.

2. Task Flow

Block-Level Flow

Step	Description
Load configuration	Call load_config() to read config/config.yaml and parse subform, task, stimulus, and trigger settings.
Collect subject info	Instantiate SubInfo(cfg['subform_config']) and call .collect() to prompt for subject_id, subname, age, and gender via a form.
Initialize Task Settings	Create TaskSettings.from_dict(cfg['task_config']), then settings.add_subinfo(subject_data) to store demographics in settings.
Setup triggers	Assign settings.triggers = cfg['trigger_config']; open a loopback serial port at 115200 baud; create TriggerSender with trigger_func writing bytes [1,225,1,0,code] and post_delay=0.001 s.
Initialize window & input	Call initialize_exp(settings) to open a PsychoPy window with parameters from window config and enable keyboard input.
Setup stimulus bank	Instantiate StimBank(win, cfg['stim_config']); call .convert_to_voice() on instruction keys (general_instruction, EC_instruction, EO_instruction, good_bye); then .preload_all().
Save settings	Call settings.save_to_json() to export all settings and subject info to a JSON file for record‐keeping.
Experiment onset	Use trigger_sender.send(settings.triggers.get("exp_onset")) to mark the start of the experiment.
Present general instructions	Create StimUnit('instruction', win, kb); add visual and voice versions of general_instruction; call .wait_and_continue() to display until spacebar press.
Countdown	Call count_down(win, 3) to show a 3-second onscreen countdown.
Run block	Instantiate BlockUnit(block_id='block_0', block_idx=0, settings, window=win, keyboard=kb); .generate_conditions(order='sequential'); .on_start() sends block_onset trigger; .on_end() sends block_end trigger; .run_trial() loops over conditions using run_trial with stim_bank and trigger_sender.
Present goodbye	Create StimUnit('block', win, kb); add visual and voice good_bye stimuli; call .wait_and_continue(terminate=True) to display until final spacebar press and then close.
Experiment end	Use trigger_sender.send(settings.triggers.get("exp_end")) to mark the end of the experiment.
Cleanup	Close the serial port (ser.close()) and call core.quit() to exit PsychoPy.

Trial-Level Flow

Step	Description
Initialize trial data	Create trial_data = {"condition": condition} to record the current condition (“EC” or “EO”).
Create StimUnit factory	Use make_unit = partial(StimUnit, win=win, kb=kb, triggersender=trigger_sender) to simplify subsequent stimulus calls.
Present condition instruction	Call make_unit(unit_label='inst'); add stim_bank.get(f"{condition}_instruction") and its voice (..._instruction_voice); then .show() to display until a keypress.
Present stimulus	Call make_unit(unit_label='stim'); add stim_bank.get(f"{condition}_stim") (EC_stim or EO_stim); then .show(duration=settings.{condition}_duration, onset_trigger=settings.triggers.get(f"{condition}_onset"), offset_trigger=settings.triggers.get(f"{condition}_offset")); finally .to_dict(trial_data) to log timestamps.
Return trial data	Return trial_data, containing condition and any timing/trigger fields added by .to_dict().

3. Configuration Summary

a. Subject Info

Field	Meaning
subject_id	Three-digit integer identifier between 101 and 999
subname	Subject’s name in Pinyin
age	Integer age in years (5–60)
gender	Choice: “Male” or “Female”

b. Window Settings

Parameter	Value
size	[1920, 1080]
units	deg
screen	1
bg_color	gray
fullscreen	True
monitor_width_cm	60
monitor_distance_cm	72

c. Stimuli

Name	Type	Description
EO_stim	text	A black “+” fixation cross shown at screen center.
EC_stim	text	A black text “请闭眼” (“please close your eyes”) shown at screen center.
general_instruction	textbox	Initial instructions in Chinese (【静息态任务说明】…), displayed centrally (font = SimHei, color = white, letterHeight = 0.78 deg, box size = [20, 5] deg); prompts participants to follow guidance and press space to start.
EC_instruction	textbox	Eyes-closed instructions in Chinese (“请您闭上眼睛…直到听到提示为止”), centrally displayed with same font, color, size, and units as above.
EO_instruction	textbox	Eyes-open instructions in Chinese (“请您睁开眼睛…直到听到提示为止”), centrally displayed with same properties.
good_bye	textbox	End-of-task screen in Chinese (“任务结束\n\n感谢您的参与\n请按【空格键】键退出”), centrally displayed with same font, color, letterHeight, and box size.

d. Timing

Phase	Duration
EC	180 seconds
EO	180 seconds

e. Triggers

Event	Code
exp_onset	98
exp_end	99
block_onset	100
block_end	101
EC_onset	10
EC_offset	11
EO_onset	20
EO_offset	21

4. Methods

The experiment consists of one block containing four sequential rest trials: eyes closed (EC), eyes open (EO), eyes closed (EC), and eyes open (EO), each lasting 180 s for a total data collection time of 720 s (12 minutes).Participants first provide demographic information (ID, name in Pinyin, age, gender) via a modal form. After settings and triggers initialize, they view general task instructions in Chinese, followed by a 3‑second on‑screen countdown. Each trial begins with an on‑screen text instruction and its pre‑recorded voice version. Immediately afterward, the resting‑state stimulus (a central fixation cross for EO trials or the text “请闭眼” (“close your eyes”) for EC trials) appears for exactly 180 s. The display window is set to 1920×1080 pixels in degrees of visual angle, with a gray background and a viewing distance of 72 cm.