Philippa A. Johnson

ORCID: 0000-0002-6125-3138
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About
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Research Areas
  • Neural dynamics and brain function
  • Visual perception and processing mechanisms
  • EEG and Brain-Computer Interfaces
  • Functional Brain Connectivity Studies
  • Vestibular and auditory disorders
  • Receptor Mechanisms and Signaling
  • Memory and Neural Mechanisms
  • Human Pose and Action Recognition
  • Advanced Vision and Imaging
  • Neuropeptides and Animal Physiology
  • Categorization, perception, and language
  • Optical measurement and interference techniques
  • Neuroendocrine regulation and behavior

Leiden University
2023-2025

Czech Academy of Sciences, Institute of Psychology
2023-2025

The University of Melbourne
2004-2024

Australian Psychological Society
2020

The transmission of sensory information through the visual system takes time. As a result these delays, available to brain always lags behind timing events in present moment. Compensating for delays is crucial functioning within dynamic environments, since interacting with moving object (e.g., catching ball) requires real-time localization object. One way might achieve this via prediction anticipated events. Using time-resolved decoding electroencephalographic (EEG) data, we demonstrate that...

10.1073/pnas.1917777117 article EN Proceedings of the National Academy of Sciences 2020-03-16

When interacting with the dynamic world, brain receives outdated sensory information, due to time required for neural transmission and processing. In motion perception, may overcome these fundamental delays through predictively encoding position of moving objects using information from their past trajectories. present study, we evaluated this proposition multivariate analysis high temporal resolution electroencephalographic data. We tracked representations at different stages visual...

10.7554/elife.82424 article EN cc-by eLife 2023-01-19

Predictive updating of an object's spatial coordinates from pre-saccade to post-saccade contributes stable visual perception. Whether object features are predictively remapped remains contested. We set out characterise the spatiotemporal dynamics feature processing during fixation and active vision. To do so, we applied multivariate decoding methods electroencephalography (EEG) data collected while human participants (male female) viewed brief stimuli. Stimuli appeared at different locations...

10.1523/jneurosci.1652-24.2024 article EN Journal of Neuroscience 2025-01-29

How consciousness arises from brain activity has been a topic of intense scientific research for decades. But how does one identify the neural basis something that is intrinsically personal and subjective? A hallmark approach to ask observers judge stimuli as ‘seen’ (conscious) ‘unseen’ (unconscious) use post hoc sorting measurements based these judgments. Unfortunately, cognitive response biases are known strongly affect place their criterion judging vs. ‘unseen’, thereby confounding...

10.7554/elife.102335.2 preprint EN 2025-02-03

How consciousness arises from brain activity has been a topic of intense scientific research for decades. But how does one identify the neural basis something that is intrinsically personal and subjective? A hallmark approach to ask observers judge stimuli as ‘seen’ (conscious) ‘unseen’ (unconscious) use post hoc sorting measurements based these judgments. Unfortunately, cognitive response biases are known strongly affect place their criterion judging vs. ‘unseen’, thereby confounding...

10.7554/elife.102335.3 preprint EN 2025-04-15

Abstract Neural processing of sensory information takes time. Consequently, to estimate the current state world, brain must rely on predictive processes – for example, extrapolating motion a ball determine its probable present position. Some evidence implicates early (pre-cortical) in extrapolation, but it remains unclear whether extrapolation continues during later-stage (cortical) processing, where further delays accumulate. Moreover, majority such relies invasive neurophysiological...

10.1101/2024.04.22.590502 preprint EN cc-by 2024-04-25

It has been suggested that, prior to a saccade, visual neurons predictively respond stimuli that will fall in their receptive fields after completion of the saccade. This saccadic remapping process is thought compensate for shift world across retina caused by eye movements. To map timing this predictive brain, we recorded neural activity using electroencephalography during saccade task. Human participants (male and female) made saccades between two fixation points while covertly attending...

10.1523/jneurosci.2134-23.2024 article EN cc-by-nc-sa Journal of Neuroscience 2024-06-13

Predictive updating of object spatial coordinates from retinotopic pre-saccadic to post-saccadic positions contributes stable visual perception. However, whether features are predictively represented at the remapped location remains contested. Many previous studies showing evidence feature remapping neglect spatially invariant representation in system. For example, feature-based attention boosts attended across entire field, potentially contributing maintenance stimulus saccades. We set out...

10.1101/2024.10.09.617414 preprint EN cc-by-nc-nd bioRxiv (Cold Spring Harbor Laboratory) 2024-10-12

How consciousness arises from brain activity has been a topic of intense scientific research for decades. But how does one identify the neural basis something that is intrinsically personal and subjective? A hallmark approach to ask observers judge stimuli as ‘seen’ (conscious) ‘unseen’ (unconscious) use post hoc sorting measurements based these judgments. Unfortunately, cognitive response biases are known strongly affect place their criterion judging ’seen’ vs. ’unseen’, thereby confounding...

10.7554/elife.102335.1 preprint EN 2024-12-02

How consciousness arises from brain activity has been a topic of intense scientific research for decades. But how does one identify the neural basis something that is intrinsically personal and subjective? A hallmark approach to ask observers judge stimuli as ‘seen’ (conscious) ‘unseen’ (unconscious) use post hoc sorting measurements based these judgments. Unfortunately, cognitive response biases are known strongly affect place their criterion judging ’seen’ vs. ’unseen’, thereby confounding...

10.7554/elife.102335 preprint EN 2024-12-02

A bstract When localising a moving object, the brain receives outdated sensory information about its position, due to time required for neural transmission and processing. The may overcome these fundamental delays through predictively encoding position of objects using from their past trajectories. In present study, we evaluated this proposition multivariate analysis high temporal resolution electroencephalographic data. We tracked representations at different stages visual processing,...

10.1101/2022.06.26.496535 preprint EN cc-by-nc-nd bioRxiv (Cold Spring Harbor Laboratory) 2022-06-29

Abstract It has been suggested that, prior to a saccade, visual neurons predictively respond stimuli that will fall in their receptive fields after completion of the saccade. This saccadic remapping process is thought compensate for shift world across retina caused by eye movements. To map timing this predictive brain, we recorded neural activity using electroencephalography (EEG) during saccade task. Participants made saccades between two fixation points while covertly attending oriented...

10.1101/2023.11.07.565952 preprint EN cc-by-nc-nd bioRxiv (Cold Spring Harbor Laboratory) 2023-11-09

A range of visual illusions, including the much-studied flash-lag effect, demonstrate that neural signals coding for motion and position interact in system. One interpretation these illusions is they are consequence extrapolation mechanisms early Here, we study recently reported High-Phi illusion to investigate whether it might be caused by same underlying mechanisms. In illusion, a rotating texture abruptly replaced new, uncorrelated texture. This leads percept large illusory jump, which...

10.1167/jov.20.13.8 article EN cc-by-nc-nd Journal of Vision 2020-12-09
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