Neuroscience and Neurobiology Commons^™

Learning Expands The Preplanning Horizon In Finger Sequence Tasks, Neda Kordjazi

Electronic Thesis and Dissertation Repository

Many everyday skills involve the production of complex sequences of movements. However, the dynamics of the interplay between action selection and execution processes in sequential movements is poorly understood.Here, we set out to investigate the extent to which information regarding upcoming actions is utilized by the motor system to preplan into the future and furthermore, how this ability is influenced by learning. We designed a finger sequence taskwhere participants were shown only a fixed number of upcoming cues regarding future presses in every trial (viewing window, W). W varied between 1 (next digit revealed with pressing the current digit – …

Characterizing The Sensorimotor Properties Of A Rapid Visuomotor Reach Movement On Human Upper Limb Muscles, Chao Gu

Electronic Thesis and Dissertation Repository

Humans and other primates rely heavily on vision as a primary sensory input to drive our upcoming volitional motor actions. Our motor system makes so many of these visual-to-motor transformations that they become ubiquitous in our daily lives. However, a central question in systems neuroscience is how does the brain perform these transformations?

Reaching movements have been an ideal model for studying volitional motor control in primates. Broadly, these visually-guided reach movements contain three inherent sensorimotor components: an action selection component, a motor execution component, and a motor learning component. A core assumption is that as reach movements become more …

Characterizing The Cortical Contributions To Working Memory-Guided Obstacle Locomotion, Carmen Wong

Electronic Thesis and Dissertation Repository

While walking in complex environments, the ability to acquire information about objects in our surroundings is essential for successful obstacle negotiation. Furthermore, the ease with which most animals can traverse cluttered terrain while grazing, exploring, or hunting is facilitated by the capacity to store obstacle information in working memory (WM). However, the underlying neural substrates supporting such complex behaviours are poorly understood. Therefore, the goal of this thesis is to examine the neural underpinnings of WM-guided obstacle negotiation in the walking cat.

Obstacle locomotion was studied in two main paradigms, characterized by whether obstacle presence was detected via vision or …