nBack is an ultra-precise, multimodal cognitive working memory training application designed exclusively for Pebble Time 2 (Emery Platform). It harnesses the full capabilities of Emery’s hardware—200×228 64-color Sharp MIP LCD, capacitive touchscreen, tactile 4-button input, and built-in raw tone generator—to deliver rigorous Dual, Triple, and Multi-modal n-Back challenges conforming to modern cognitive science standards.
Shape (10 Distinct geometric primitives rendered via GContext)
Number (1–9 Digit recall)
Letter (8-Letter phonetic working memory)
Vibration (Haptic pulse pattern matching)
Audio (26-Letter A–Z International Morse code audio tone synthesis)
Adaptive Auto-Leveling: Automatically adjusts n-Back difficulty (n=1 to n=7) based on real-time performance thresholds.
Strict FSM Architecture: Zero state-bypass execution model guaranteeing lifecycle purity and instant responsiveness.
OPFS Local Sandbox: Training session histories and player profiles are saved inside the mobile browser’s Origin Private File System (OPFS) for private, robust local storage.
Audio Stimulus: Morse Code Sound Patterns
The audio modality utilizes the Pebble Time 2 (Emery) built-in speaker to synthesize International Morse Code for all 26 English letters (A–Z).
Sound Synthesis Parameters
Parameter
Specification
Description
Tone Pitch
523 Hz (MIDI Note 72, C5)
Pure Sine Wave (SpeakerWaveformSine)
Dot (·) Duration
65 ms
Short tone pulse
Dash (—) Duration
195 ms
Long tone pulse (3 \times \text{Dot})
Element Gap
50 ms
Silence between dots and dashes within a letter
Volume
85 / 100
Internal raw tone generator
Letter-to-Sound Pattern Mapping (A–Z)
Letter
Sound Pattern
Letter
Sound Pattern
Letter
Sound Pattern
Letter
Sound Pattern
A
· —
H
· · · ·
O
— — —
V
· · · —
B
— · · ·
I
· ·
P
· — — ·
W
· — —
C
— · — ·
J
· — — —
Q
— — · —
X
— · · —
D
— · ·
K
— · —
R
· — ·
Y
— · — —
E
·
L
· — · ·
S
· · ·
Z
— — · ·
F
· · — ·
M
— —
T
—
G
— — ·
N
— ·
U
· · —
Target Platform Specifications
Specification
Details
Target Device
Pebble Time 2 (Emery)
Display
200 × 228 pixels, 64-Color MIP LCD
Sensors & I/O
4 Physical Buttons, Capacitive Touchscreen, 3D Accelerometer, Built-in Speaker
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