goxpyriment

Hemispheric Differences in Word Processing

A lateralized recognition memory experiment investigating differences between the left and right cerebral hemispheres in processing written words.

Study phase: words are presented in the left visual field (LVF) or right visual field (RVF) — projecting initially to the right and left hemispheres respectively.

Test phase: words appear at the centre of the screen. Participants judge whether each word is old (seen during study) or new.

Trial structure

Study phase

Central fixation  →  Word (LVF or RVF)  →  ITI

Test phase

Central fixation  →  Word (centre)  →  Old/New response  →  ITI

Response keys

Key	Meaning
`F`	Old (seen before)
`J`	New (not seen before)

Prerequisites

Go 1.25+
SDL3 development libraries (sudo apt install libsdl3-dev on Ubuntu/Debian)

Running

# Fullscreen, participant 1
go run main.go -s 1

# Windowed (development / testing)
go run main.go -s 1 -d

Flags

Flag	Default	Description
`-s`	`0`	Participant ID (integer)
`-d`	off	Development mode: windowed 1024×768

Output

Data are saved to goxpy_data/ as a .xpd file (CSV with a metadata header). One row per trial:

Column	Description
`trial_index`	Trial number
`phase`	`study` or `test`
`word`	The presented word
`vf`	Visual field during study: `LVF` or `RVF`
`lag_tag`	Lag category between study and test
`lag_ms`	Time between study and test presentation (ms)
`key`	Key pressed
`rt`	Reaction time in milliseconds
`correct`	Whether the response was correct

This site is open source. Improve this page.