Search

Your search keyword '"Rucci, Michele"' showing total 290 results
Start Over Author "Rucci, Michele"
290 results on '"Rucci, Michele"'

1. Detailed characterization of neural selectivity in free viewing primates.

Author

Yates, Jacob, Coop, Shanna, Sarch, Gabriel, Wu, Ruei-Jr, Butts, Daniel, Rucci, Michele, and Mitchell, Jude

Subjects
Animals, Visual Cortex, Visual Fields, Vision, Ocular, Eye Movements, Haplorhini, Photic Stimulation
Abstract

Fixation constraints in visual tasks are ubiquitous in visual and cognitive neuroscience. Despite its widespread use, fixation requires trained subjects, is limited by the accuracy of fixational eye movements, and ignores the role of eye movements in shaping visual input. To overcome these limitations, we developed a suite of hardware and software tools to study vision during natural behavior in untrained subjects. We measured visual receptive fields and tuning properties from multiple cortical areas of marmoset monkeys who freely viewed full-field noise stimuli. The resulting receptive fields and tuning curves from primary visual cortex (V1) and area MT match reported selectivity from the literature which was measured using conventional approaches. We then combined free viewing with high-resolution eye tracking to make the first detailed 2D spatiotemporal measurements of foveal receptive fields in V1. These findings demonstrate the power of free viewing to characterize neural responses in untrained animals while simultaneously studying the dynamics of natural behavior.

Published
2023

11. Temporal sensitivity in the central fovea

Author

Lin, Ruitao, primary, Benedetto, Alessandro, additional, Intoy, Janis, additional, Moon, Benjamin, additional, Clark, Ashley M., additional, Jenks, Samantha K., additional, Kapisthalam, Sanjana, additional, Poletti, Martina, additional, and Rucci, Michele, additional

Published
2023
Full Text
View/download PDF

14. Microsaccades in head-free high-acuity tasks

Author

Jolly, Paul, primary, Li, Yuanhao H., additional, Cox, Michele A., additional, Clark, Ashley M., additional, Yang, Bin, additional, Lin, Ruitao, additional, Zhao, Zhetuo, additional, and Rucci, Michele, additional

Published
2023
Full Text
View/download PDF

19. Eye blinks as a visual processing stage.

Author

Bin Yang, Intoy, Janis, and Rucci, Michele

Subjects
BLINKING (Physiology), EYE movements, EYE tracking, NEURAL pathways, SPATIAL behavior
Abstract

Humans blink their eyes frequently during normal viewing, more often than it seems necessary for keeping the cornea well lubricated. Since the closure of the eyelid disrupts the image on the retina, eye blinks are commonly assumed to be detrimental to visual processing. However, blinks also provide luminance transients rich in spatial information to neural pathways highly sensitive to temporal changes. Here, we report that the luminance modulations from blinks enhance visual sensitivity. By coupling high-resolution eye tracking in human observers with modeling of blink transients and spectral analysis of visual input signals, we show that blinking increases the power of retinal stimulation and that this effect significantly enhances visibility despite the time lost in exposure to the external scene. We further show that, as predicted from the spectral content of input signals, this enhancement is selective for stimuli at low spatial frequencies and occurs irrespective of whether the luminance transients are actively generated or passively experienced. These findings indicate that, like eye movements, blinking acts as a computational component of a visual processing strategy that uses motor behavior to reformat spatial information into the temporal domain. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

21. Active Encoding of Space through Time

Author

Rucci, Michele and Victor, Jonathan D

Subjects
Computational Neuroscience, eye movements, Behavioral Neurobiology, Visual perception, Cognitive Neuroscience, sensory representations, Systems Neuroscience
Published
2023

22. Task-driven influences on fixational eye movements

Author

Victor, Jonathan, Lin, Yen-Chu, and Rucci, Michele

Subjects
active vision, Computational Neuroscience, fixational eye movements, Systems Neuroscience, ocular drift
Abstract

There is now compelling evidence that the spatiotemporal remapping carried out by fixational eye movements (FEMs) is an essential step in visual processing. Moreover, the overall Brownian-like statistics of FEMs are calibrated to map fine spatial detail into the temporal frequency range to which retinal circuitry is tuned. Here, we tested the hypothesis that the detailed spatial characteristics of FEMs can be adjusted to task demands via cognitive influences that operate even in the absence of a visual stimulus. We examined FEMs in a task that required subjects (N=6) to report which of two letters was displayed. Trials were blocked; in each block, the letter pair was known in advance: H vs. N or E vs. F. The task was demanding: letters were 1.5 deg and embedded in 1/f noise, and had a contrast that yielded ~75% correct performance. Note that the HN discrimination could be accomplished by identification of either a horizontal or oblique contour, but the EF discrimination required identification of a horizontal contour. Thus, in the EF blocks, only a vertical ocular drift would be expected to maximize the neural signal. For each condition, FEM velocity statistics, which were approximately Gaussian, were characterized by their covariance. As predicted, the ratio of velocity variance in the vertical vs. oblique direction was greater in EF trials than in HN trials. This difference was greater when no stimulus was present (20% of trials in each block), indicating open-loop control. We also found that single-trial drift trajectories could be decoded by a simple decoder to identify the task (HN vs. EF) at above-chance levels in most subjects. While the observed covariance patterns showed substantial inter-subject variability, we found that a single transformation, applied with subject-specific strengths, could largely account for all subjects’ findings. Critically, this shared transformation acts holistically on the plane, rather than individually on horizontal and vertical axes. In sum, we find that knowledge of the specific requirements of a visual task exerts fine-tuned open-loop control over ocular drifts, and we characterize the nature of this control.

Published
2023

29. Depth Estimation during Fixational Head Movements in a Humanoid Robot

Author

Antonelli, Marco, del Pobil, Angel P., Rucci, Michele, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Chen, Mei, editor, Leibe, Bastian, editor, and Neumann, Bernd, editor

Published
2013
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results