11. This visual signal , a Japanese concept, is called a kanban. 12. When messages were even more urgent, visual signals were used. 13. He relies on visual signals to communicate with his teammates. 14. Members of the group communicate using a complex system including vocal, chemical, and visual signals . 15. Superimposing and processing these monocular visual signals allow the visual cortex to generate stereoscopic vision. 16. Yale later used visual signals , including adjustments of the captain's knit hat, to call plays. 17. The adults use chest rubbing as a visual signal , dragging branches along their chest slowly. 18. When a fencer hits an opponent properly, the machine issues an audible and visual signal . 19. The majority of visual signals throughout the 1970s and 1980s were white or red incandescent lights. 20. Fossas communicate using sounds, scents, and visual signals .
