Buildup of Choice-Predictive in Human Motor Cortex during Perceptual Decision M

gpretations of sensory information onto complex courses of anterior part of dorsal premotor cortex (PMd). Thus, in accordaction. A simple example is perceptual detection, in which a noisy sensory signal is converted into an arbitrary behavioral response (e.g., a verbal report or button press) indicating our sensory experience, or the lack thereof [3]. Although this is the most elementary perceptual task, our understanding of the neural mechanisms mediating this conversion is still incomplete [1, 5]. Here, we used magnetoencephalography with previous studies [16–18, 20], neural activity in human motor cortex exhibited robust lateralized effector selectivity of opposite polarity in beta and gamma frequency bands. Buildup of Choice-Predictive Activity during Stimulus Viewing A notable aspect of the effector-selective activity was that it gradually built up already during stimulus viewing (Figure 2B; Figure 3). To study this in more detail, we estimated single-tria