How Optic Flow and Inertial Cues Improve Motion Perception

Angelaki, Dora E.

doi:10.1101/sqb.2014.79.024638

Cited by 11 publications

(7 citation statements)

References 97 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In MEC, speed cells retain their general coding features in complete darkness, but firing rates and the slopes of linear fits between firing rate and running speed decrease 16 , suggesting that visual inputs calibrate their response features. Visual inputs could provide a measure of self-motion in the form of optic flow 20 , which must be combined with other multisensory signals to generate a unified self-motion percept 21 . However, the influence of optic flow on MEC speed cells has not been directly measured.…”

Section: Main Textmentioning

confidence: 99%

Principles governing the integration of landmark and self-motion cues in entorhinal cortical codes for navigation

et al. 2018

View full text Add to dashboard Cite

To guide navigation, the nervous system integrates multisensory self-motion and landmark information. We examined how these inputs generate the representation of self-location by recording entorhinal grid, border and speed cells in mice navigating virtual environments. Manipulating the gain between the animal’s locomotion and the visual scene revealed that border cells responded to landmark cues while grid and speed cells responded to combinations of locomotion, optic flow, and landmark cues in a context-dependent manner, with optic flow becoming more influential when it was faster than expected. A network model explained these results, providing principled regimes under which grid cells remain coherent with or break away from the landmark reference frame. Moreover, during path integration-based navigation, mice estimated their position following the principles predicted by our recordings. Together, these results provide a quantitative framework for understanding how landmark and self-motion cues combine during navigation to generate spatial representations and guide behavior.

show abstract

Section: Main Textmentioning

confidence: 99%

Principles governing the integration of landmark and self-motion cues in entorhinal cortical codes for navigation

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Likewise, the role of attention shift after the first perturbation cycle was not considered [ 112 ]. Our experimental approach does not allow to address all these issues, given the multifaceted patterns of brain areas activation following adaptation to postural perturbations [ 54 ], the presence of a condition of predictable continuous perturbations [ 54 ], and the amazing complexity of theories on this topic [ 14 , 113 – 116 ]. As a consequence, our model used to calculate the time constant could have been too simplistic, or biased, in particular when the data variance around the population mean was high and the changes in amplitude of the steady state PP segments’ displacement were unimportant compared to the initial cycles.…”

Section: Limitationsmentioning

confidence: 99%

Adaptation of balancing behaviour during continuous perturbations of stance. Supra-postural visual tasks and platform translation frequency modulate adaptation rate

2020

View full text Add to dashboard Cite

When humans are administered continuous and predictable perturbations of stance, an adaptation period precedes the steady state of balancing behaviour. Little information is available on the modulation of adaptation by vision and perturbation frequency. Moreover, performance of supra-postural tasks may modulate adaptation in as yet unidentified ways. Our purpose was to identify differences in adaptation associated to distinct visual tasks and perturbation frequencies. Twenty non-disabled adult volunteers stood on a platform translating 10 cm in antero-posterior (AP) direction at low (LF, 0.18 Hz) and high frequency (HF, 0.56 Hz) with eyes open (EO) and closed (EC). Additional conditions were reading a text fixed to platform (EO-TP) and reading a text stationary on ground (EO-TG). Peak-to-peak (PP) displacement amplitude and AP position of head and pelvis markers were computed for each of 27 continuous perturbation cycles. The time constant and extent of head and pelvis adaptation and the cross-correlation coefficients between head and pelvis were compared across visual conditions and frequencies. Head and pelvis mean positions in space varied little across conditions and perturbation cycles but the mean head PP displacements changed over time. On average, at LF, the PP displacement of the head and pelvis increased progressively. Adaptation was rapid or ineffective with EO, but slower with EO-TG, EO-TP, EC. At HF, the head PP displacement amplitude decreased progressively with fast adaptation rates, while the pelvis adaptation was not apparent. The results show that visual tasks can modulate the adaptation rate, highlight the effect of the perturbation frequency on adaptation and provide evidence of priority assigned to pelvis stabilization over visual tasks at HF. The effects of perturbation frequency and optic flow and their interaction with other sensory inputs and cognitive tasks on the adaptation strategies should be investigated in impaired individuals and considered in the design of rehabilitation protocols.

show abstract

“…Higher precision reflects more reliable discrimination by the observer. Precision is a measure of variance in responses corresponding to the steepness of the fitted sigmoid, calculated as the 'sigma' of the cumulative Gaussian fit of the psychometric function [1]. "Bias" in this sense is the bias of the percept compared to the true stimulus value.…”

Section: Discussionmentioning

confidence: 99%

“…In studies of perceptual decision-making, two independent features can be disentangled, by fitting a psychometric function to behavioural data from two-alternative forced choice (2AFC) paradigms [1]: bias (i.e. how biased perception of a stimulus is in relation to its actual properties) and precision (i.e.…”

Section: Introductionmentioning

confidence: 99%

Reducing variability of perceptual decision making with offline theta-burst TMS of dorsal medial frontal cortex

et al. 2020

View full text Add to dashboard Cite

Background: Recent evidence suggests that the dorsal medial frontal cortex (dMFC) may make an important contribution to perceptual decision-making, and not only to motor control. Objective/hypothesis: By fitting psychometric functions to behavioural data after TMS we tested whether the dMFC is critical specifically for the precision and/or bias of perceptual judgements. Additionally we aimed to disentangle potential roles of the dMFC in dealing with perceptual versus response switching. Methods: A subjective visual vertical task (SVV) was used in which participants weight visual (and other, e.g., vestibular) information to establish whether a line is oriented vertically. To ensure a high perceptual demand (putatively necessary to demonstrate a dMFC involvement) SVV lines were presented inside pop-out targets within a visual search array. Distinct features of perceptual performance were analysed before as compared to following theta-burst TMS stimulation of the dMFC, a control site, or no stimulation, in three groups, each of 20 healthy participants. Results: dMFC stimulation improved the precision of verticality judgments. Moreover, dMFC stimulation improved accuracy, selectively when response switches occurred with perceptual repeats. Conclusion: These findings point to a causal role of the dMFC in establishing the precision of perceptual decision making, demonstrably dissociable from an additional role in motor control in attentionally demanding contexts.

show abstract

How Optic Flow and Inertial Cues Improve Motion Perception

Cited by 11 publications

References 97 publications

Principles governing the integration of landmark and self-motion cues in entorhinal cortical codes for navigation

Principles governing the integration of landmark and self-motion cues in entorhinal cortical codes for navigation

Adaptation of balancing behaviour during continuous perturbations of stance. Supra-postural visual tasks and platform translation frequency modulate adaptation rate

Reducing variability of perceptual decision making with offline theta-burst TMS of dorsal medial frontal cortex

Contact Info

Product

Resources

About