Table 1.
Forelimb muscles recorded in each monkey.
| Muscle | Abbreviation | Recording frequency | ||
|---|---|---|---|---|
| Monkey W | Monkey B | |||
| Digits | Extensor digitorum communis | EDC | 7/7 | 3/5 |
| Extensor digitorum two and three | ED23 | 3/5 | ||
| Extensor digitorum four and five | ED45 | 2/7∗ | 1/5 | |
| Flexor digitorum superficialis | FDS | 6/7 | 1/5 | |
| Flexor digitorum profundus | FDP | 3/7 | 2/5 | |
| Extensor pollicis longus | EPL | 1/5 | ||
| Abductor pollicis longus | APL | 7/7 | 2/5 | |
| Palmaris longus | PL | 3/7 | 3/5 | |
| Wrist | Extensor carpii radialis | ECR | 6/7 | 3/5 |
| Extensor carpii ulnaris | ECU | 3/5 | ||
| Flexor carpii radialis | FCR | 6/7 | 3/5 | |
| Flexor carpii ulnaris | FCU | 2/7 | 4/5 | |
| Elbow | Brachioradialis | BR | 2/5 | |
| Biceps | BIC | 2/7 | 2/5 | |
| Triceps | TRI | 4/7 | 2/5 | |
| Shoulder | Acromion deltoid | AcDLT | 5/7 | 2/5 |
| Spino deltoid | SpDLT | 4/7 | 2/5 | |
| Cleido deltoid | ClDLT | 2/5 | ||
| Pectoralis | PEC | 4/7 | 2/5 | |
| Teres major | TM | 2/5 | ||
| Latissimus dorsii | LAT | 2/7 | ||
EMGs were recorded in 12 sessions (1 session/day) over a 2–3-week period. Seven sessions were conducted in monkey W, 5 in monkey B. In a given session, EMGs of combinations of 9 muscles were recorded simultaneously. Numerical entries indicate recording frequency, i.e., (number of sessions in which EMGs of a given muscle were recorded) / (total number of sessions). ∗EMGs of ED45 in monkey W were not included in the analyses because of technical difficulties. EMGs, intramuscular electromyograms.