Encoding of Reward and Physical Effort by sensorimotor cortical local field potentials

Taruna Yadav
Reward expectation in humans and animals is known to modulate behavior and its valuation
is discounted by the physical effort associated with the movement. Our previous work has
shown reward encoding within the macaque premotor (PMd), motor (M1), and
somatosensory (S1) cortices. However, the involvement of these regions in concurrent
processing of reward and effort information is not clearly understood. To address this gap,
we asked how the reward representation in local field potentials (LFPs), recorded from the
PMd, M1, and S1 are influenced by physical effort requirements of the motor task. We
trained a nonhuman primate to perform three variations of a planar center-out reaching
task: reward-only, effort-only, and reward-effort tasks. Our results showed an inverse
relationship between reward-value and LFP amplitude as well as subjective influence of
effort information on the reward value encoded by the LFP amplitude.