Jonathan A. Winawer

Foveated metamers of the early visual system

This paper investigates how visual feature representation changes with eccentricity by comparing human perception and models of luminance and spectral energy.

Normalization accounts for temporal dynamics in human somatosensory cortex

The paper shows that divisive normalization models better capture temporal dynamics in human somatosensory cortex compared to linear models, mirroring visual cortex findings.

An increasingly efficient narrowband object-recognition channel along the ventral stream

The paper investigates how the ventral stream processes natural images with noise, finding that recognition bandwidth is conserved but noise tolerance increases along the stream.

EasyEyes: Crowded Dynamic Fixation for Online Psychophysics

EasyEyes introduces a crowded dynamic fixation task to improve gaze accuracy in online psychophysics testing, reducing peeking and implausible low thresholds.

Unpacking the V1 map: Differential covariation of preferred spatial frequency and cortical magnification across spatial dimensions

The paper examines how cortical magnification and preferred spatial frequency in V1 covary with eccentricity and polar angle, finding proportionality in eccentricity but not polar angle.

Precise Spatial Tuning of Visually Driven Alpha Oscillations in Human Visual Cortex

The paper measures alpha oscillations in human visual cortex using intracranial electrodes and finds they are spatially specific, with receptive field models showing larger spatial tuning compared to broadband power.

Neuronal or vascular receptive fields? On the relation between BOLD-fMRI population receptive field (pRF) estimates and cortical vascularization.

This study examines how vascular compartments affect pRF size estimates in early visual cortex using BOLD-fMRI and finds no significant vascular influence on pRF size.

Machine Learning Matches Human Performance at Segmenting the Human Visual Cortex

This paper trains CNNs to segment human visual cortex areas with accuracy comparable to human raters using functional and anatomical data.

Traveling Waves in the Human Visual Cortex: an MEG-EEG Model-Based Approach

This paper develops a model-based approach to detect traveling waves in human visual cortex using MEG-EEG, showing improved accuracy when modeling stimulus-induced traveling waves.

Early visual cortex supports one-shot episodic memory via spatially tuned reactivation

This study shows that early visual cortex reactivates spatially tuned representations during one-shot episodic memory retrieval, linking neural activity to memory performance.

Feedback scales the spatial tuning of cortical responses during both visual working memory and long-term memory

The paper shows that visual cortex responses during memory differ in spatial tuning from perception, with feedback widening tuning during both working and long-term memory.

Temporal dynamics of short-term neural adaptation across human visual cortex

The paper examines how neural adaptation in human visual cortex varies across the visual hierarchy using iEEG data and a computational model of normalization dynamics.

Human V4 size predicts crowding distance

The paper measures crowding distance and V4 map size in humans to find that V4 size predicts the spacing limit of visual perception.

How spatial attention alters visual cortical representation during target anticipation

This study shows spatial attention alters visual cortex responses before target onset, improving performance at cued locations and changing neural response properties across visual field maps.

Normalization by orientation-tuned surround in human V1-V3

The paper shows that a tuned normalization model better explains fMRI responses to curved and straight stimuli in V1-V3 than a classical divisive normalization model.

The Bouma law accounts for crowding in fifty observers

This paper validates the Bouma law across 50 observers, showing it explains 82-94% of crowding distance variance, with additional factors revealing asymmetries and proposing a standardized Bouma factor b for cross-study comparisons.

Spatial Frequency Maps in Human Visual Cortex: A Replication and Extension

The paper replicates and extends a model of spatial frequency tuning in human visual cortex, showing consistent parameters across datasets and revealing increased tuning bandwidth in higher visual areas.

Comparing retinotopic maps of children and adults reveals a late-stage change in how V1 samples the visual field

The paper compares retinotopic maps in children and adults, finding that children have similar V1 surface area for upper and lower vertical meridians, while adults show asymmetry, indicating a late-stage developmental change.

Mnemonic content and hippocampal patterns shape judgments of time

The paper investigates how memory accessibility and hippocampal patterns influence temporal duration judgments through behavioral and fMRI experiments.

Perception and memory have distinct spatial tuning properties in human visual cortex

This study shows that spatial tuning properties differ between perceptual activity and memory retrieval in human visual cortex, with reduced spatial precision in memory that cannot be explained by noise or performance.

Variability of the Surface Area of the V1, V2, and V3 Maps in a Large Sample of Human Observers

The paper quantifies individual variability in the size and structure of visual areas V1, V2, and V3 across a large sample of human observers and examines twin similarities.

Temporal dynamics of neural responses in human visual cortex

The paper models temporal dynamics of neural responses in human visual cortex using a computational model that captures contrast and adaptation effects across different visual areas.

Non-neural factors influencing BOLD response magnitudes within individual subjects

The paper investigates non-neural factors affecting BOLD response magnitudes in human participants and proposes a correction method to improve fMRI data interpretation.

Structural covariance and heritability of the optic tract and primary visual cortex in living human brains

The paper examines the structural covariance and heritability between the optic tract and primary visual cortex in living humans using neuroimaging data.

Linking individual differences in human primary visual cortex to contrast sensitivity around the visual field

The paper links individual differences in V1 cortical magnification to contrast sensitivity across visual field meridians using fMRI and psychophysics.

Mapping Spatial Frequency Preferences Across Human Primary Visual Cortex

The paper maps spatial frequency preferences in human primary visual cortex using fMRI, finding a relationship between preferred spatial frequency and eccentricity, with small effects from stimulus orientation.

Asymmetries around the visual field: From retina to cortex to behavior

The paper quantifies polar angle asymmetries in visual performance and shows that mRGC signals and phototransduction contribute to these differences, but cortical factors also play a role.

A visual encoding model links magnetoencephalography signals to neural synchrony in human cortex

The paper develops a model linking MEG signals to neural synchrony in the human cortex, finding two distinct response types: synchronous and asynchronous.

Cross-dataset reproducibility of human retinotopic maps

This study assesses the reproducibility of retinotopic maps across two fMRI datasets, finding consistent pRF properties despite differences in experimental protocols.

A Population Receptive Field Model of the Magnetoencephalography Response

This paper introduces a model that uses fMRI-derived population receptive fields to predict MEG responses, showing they explain up to 60% of variance in sensor data.