Once a behaving organism has acquired, processed, and transmitted sensory information it must still alter patterns of motor activation in a manner that enables control. A central challenge in understanding motor control, particularly during complex rhythmic behaviors like flight, is decoding the specific features of body dynamics that are control by patterns of neural feedback […]
Continue reading Simultaneous dimensionality reduction of motor commands and movement
Locomotion is an inherently closed-loop process. What that means is that when we move it changes how we perceive the world — turning to your left is like the world around you rotating to the right. As a result, what we see (or sense) is the difference between how an object in our world is […]
Continue reading Control theoretic approaches to experiment and analysis of locomotion
The established perspective of flight control in insects holds that their remarkable maneuverability arises from neural modulation of relatively small steering muscles acting in concert with the regular, clock-like activation of larger power muscles. Yet the power output of these main muscles is very sensitive to subtle timing changes in neural activation. To test if […]
In the previous project we altered the commands the cockroach’s brain was sending to its muscle in real-time while the animal was running or maintaining its posture. We found that the same muscle could have three different function even when activated by the same commands. These differences seemed to arise for the mechanical context in […]
Continue reading An intact-limb workloop reveals how cockroach muscle changes function
What is the potential of a particular muscle to control locomotion and how does mechanics affect the control consequences of neural feedback to a muscle?Electrophysiological recordings of nerves and muscles during perturbations do not address how particular motor activation patterns control locomotion since many muscles can change in parallel and each can act in unexpected […]
Animals must sense their environment in order to navigate. American cockroaches (Periplaneta americana L.) in the natural world often face navigation challenges in cluttered, low-light environments. To supplement their vision, they use their antenna as tactile probes. They can track surfaces with their long antennae by letting the antenna bend against the surface and rapidly […]
Continue reading Bio-inspiration from how cockroaches navigate by touch
We tested whether mechanical stabilization strategies without external sensing can yield successful locomotion in a challenging environment. In this study, we ran cockroaches (Blaberus discoidalis) over a highly complex terrain with obstacles up to three times cockroach hip height to repeatedly perturb body dynamics. Cockroaches provide excellent systems for neuromechanical experiments because they are experimentally robust and […]
