Sohie Lee Moody's research while affiliated with Wellesley College and other places
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Publications (7)
This chapter discusses population coding in the motor cortex. Single unit activity, accounted for input-output transforms in distributed neural networks. Serial recording during a stereotyped task has no demerits in understanding population coding, assuming a reasonable neuronal sample, and a hypothesis related to relatively stereotyped input-outpu...
When a small, focally attended visual stimulus and a larger background frame shift location at the same time, the frame's new location can affect spatial perception. For horizontal displacements on the order of 1--2 degrees, when the frame moves more than the attended stimulus, human subjects may perceive that the attended stimulus has shifted to t...
Neural network models were examined during delayed matching-to-sample tasks (DMS), and neurons in a monkey's prefrontal cortex were studied during the performance of comparable tasks. In DMS, various input stimuli follow a sample stimulus, and an output should occur whenever the sample reappears. Our previous models have been restricted to certain...
We examined neuronal activity in three motor cortical areas while a rhesus monkey adapted to novel visuomotor transforms. The monkey moved a joystick that controlled a cursor on a video screen. Each trial began with the joystick centered. Next, the cursor appeared in one of eight positions, arranged in a circle around a target stimulus at the cente...
A fully recurrent neural network model was optimized to perform a spatial delayed matching-to-sample task (DMS). In DMS, a stimulus is presented at a sample location, and a match is reported when a subsequent stimulus appears at that location. Stimuli elsewhere are ignored. Computationally, a DMS system could consist of memory and comparison compon...
Features of virtually all voluntary movements are represented in the primary motor cortex. The movements can be ongoing, imminent, delayed, or imagined. Our goal was to investigate the dynamics of movement representation in the motor cortex. To do this we trained a fully recurrent neural network to continually output the direction and magnitude of...
Citations
... There recently has also been the development of larger-scale cortical models which contain tens of thousands of spiking neuron models [43,2]. However, previous models of the motor cortex have been limited in replicating physiological detail and mainly been focused on generating movement dynamics or responses to stimulation [44,45,43,46]. The role of network connectivity in generating spontaneous cortical activity in physiologically-based spiking neural network models has not been explored. ...
... Our work follows up on earlier neurocomputational work addressing the putative cortical basis of working memory [24,[115][116][117]. A clear and strong difference between model architectures was present in the duration of maintained activity within activated cell assembly circuits. ...
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... Error-based learning is associated with changes in connectivity between the supplementary motor area (SMA) and other sensorimotor regions in humans (Vahdat et al. 2011;Tzvi et al. 2022). Movement-related neural spiking activity in the macaque SMA changes over the course of sensory error-based learning (Wise et al. 1998;Padoa-Schioppa et al. 2004), particularly in the early stages (Paz et al. 2005). It has previously been argued that sensory error is confounded with reinforcement outcomes when perturbations causing sensory errors also disrupt attainment of task goals. ...
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... [139], "proactive control", see [140] for a review). Such an interpretation is supported by a modeling study of Moody and Wise [141] showing that an anticipatory activity emerges in some neurons before the cue during a match-tosample task, but only if the cue timing is predictable. Removing these neurons either leads to false negative or false positive responses. ...
... The ventral stream for the perception of the sensory feedback ("external monitoring" of error) from the environment at the primary sensory cortex flows to the sensory association cortex and then to the posterior association cortex (e.g., supramarginal gyrus), leading to conscious error perception in the ventrolateral PFC (VLPFC). Here, the PFC interacts through reciprocal and reentrant connections with different areas of the posterior association cortex [27], including the superior parietal lobule (SPL) and supramarginal gyrus (SMG), to integrate the information from multiple sensory inputs and motor actions [54] for action perception [53]. These multiple visual streams are increasingly being established in humans via functional connectivity and diffusion tractography [81]. ...
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... The most extensive analysis of neuronal activity during the adaptation of displacement maps has been for " rotation " experiments (Wise, Moody, Blomstrom, and Mitz, 1998;Moody and Wise, 2001), although other transforms have also been used. As a population, cells in PMd, the supplementary motor area (SMA), and M1 all showed dramatic changes in their properties during adaptation of displacement maps. ...
