Neural State Classifier · EEG Mental Imagery

Acquisition

Neurofeedback

Model

Library

Protocol & stimulus Timing · markers

Protocol mode

Visual: short stimulus + gray ISI; align band powers with onsets.

Stimulus type Same taxonomy as the standalone stimulus pages (color / shape / both).

Timing

Prep countdown before recording Seconds before the backend trial starts (LSL marker + beep fire at trial onset).

Stimulus duration (ms) Displayed & sent in LSL marker (external VR/stimulus app).

Inter-stimulus interval / gray mask (ms)

Repetitions per block

Recording epoch (display) Progress bar only; backend epoch extraction stays at 4 s unless the server is updated.

EEG analysis window (ms post-onset)

Recording & cues

Send LSL markers via backend (POST /lsl/marker) Audio cue at trial onset (short beep)

Angular size (visual °)

Blocks & modular options

Enable breaks between series Trials per series (before break)

Randomize trial order (logged locally) WebXR / VR session (use external fullscreen stimulus page)

3D rotation speed (rad/s) Tracking dots (pilot testing)

Ganzfeld pre-experiment (optional)

Enable Ganzfeld sequence before color trials (long run-in) Durations are stored for your external runner; not executed in this dashboard.

Duration per color (s)

HSV transition (s)

Final black (s)

Settings saved in this browser

Current trial —

—

No active trial — start Class A or B

Self-rating

Excellent

EEG topomap Live

Alpha—

Beta—

Theta—

Gamma—

History · Class A 0 trials · 0 kept

Prep 3 s · stim 300 ms · ISI 2500 ms · epoch display 4 s

Convergence to stable state Phase 3 · Active

Class A —

Target

Class B —

Target

Raw signal · preview 250 Hz

Audio feedback (NF)

On target

—

Divergence detected

—

Neutral band

Last trial NF · —

Distance to reference model · history

Metric: cosine distance · 8D CSP space

Feature extraction pipeline

EEG raw
16 ch

→

Filter
1–40 Hz

→

CSP
8 comp.

→

Log-var
features

→

LDA
classifier

→

Stable
state

CSP parameters

n_components8

reg0.05 (Ledoit-Wolf)

logTrue

norm_traceFalse

epoch window2–8 s

Convergence criterion

MetricCosine distance

Convergence thresholdd < 0.12

Rolling window5 trials

Min. trials kept8

Min. score≥ 4 / 5

Library · session

Apple

Session 1 · 23 trials
11 kept · 3 NF sessions

Cube

Session 1 · 20 trials
9 kept · 2 NF sessions

Flame

Session 2 · 25 trials
13 kept · 4 NF sessions

Chair

Session 3 · in progress
18 trials · NF active

Spiral

Session 3 · in progress
17 trials · phase 2

New class

Cross-subject generalization

S01

Subject 01

4 classes · 86 trials · Ref

91%

S02

Subject 02

4 classes · 72 trials · Transfer

78%

S03

Subject 03

In progress · session 1

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EEG mental-imagery classification paradigm — acquisition, neurofeedback, and object library dashboard