Sensitivity to chromatic and luminance contrast and its neuronal substrates

Lee, Barry B.

doi:10.1016/j.cobeha.2019.08.006

Cited by 7 publications

(6 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, an umpire will predominantly utilise the ventral stream for their predictive response. Findings from this study add further support to research suggesting that information processed through the dorsal stream is affected by the change or reduction in contrast luminance, 23 thus accounting for the differing opinions around the visibility of the pink ball.…”

Section: Discussionsupporting

confidence: 78%

Is the pink ball still under review? Cricket umpires’ perceptions of the pink ball for day/night matches

Maguire

Timmis

Wilkins

et al. 2021

Journal of Science and Medicine in Sport

View full text Add to dashboard Cite

Section: Discussionsupporting

confidence: 78%

Is the pink ball still under review? Cricket umpires’ perceptions of the pink ball for day/night matches

Maguire

Timmis

Wilkins

et al. 2021

Journal of Science and Medicine in Sport

View full text Add to dashboard Cite

“…The chromatic CSs were isoluminant red/green Gabor patches on an isoluminant gray background, with the isoluminance threshold determined for each participant using flicker photometry. Accordingly, orientation information that differentiated CS 1 and CSwas contained solely in the color, which is known to efficiently activate the P but largely silence the M pathway (Merigan and Maunsell, 1993;Lee, 2011Lee, , 2019. Additionally, these Gabor patches contained only high-spatial frequency information (.4 cycles/°) to further minimize M pathway activation.…”

Section: Discussionmentioning

confidence: 99%

“…1A). These two types of stimuli are known to bias the engagement of the parvocellular (P) versus magnocellular (M) visual pathways, preferentially mediating cortical versus subcortical signal transmission, respectively (Merigan and Maunsell, 1993;Lee, 2011Lee, , 2019. Accordingly, these stimuli would evoke distinct VEPs [e.g., a positive-going (P1) component and a negative-going (C1) component, respectively], allowing for differentiation of CS processing in parallel subcortical and cortical pathways (Fig.…”

Section: Introductionmentioning

confidence: 99%

Human Sensory Cortex Contributes to the Long-Term Storage of Aversive Conditioning

You

Brown

2021

J. Neurosci.

View full text Add to dashboard Cite

Growing animal data evince a critical role of the sensory cortex in the long-term storage of aversive conditioning, following acquisition and consolidation in the amygdala. Whether and how this function is conserved in the human sensory cortex is nonetheless unclear. We interrogated this question in a human aversive conditioning study using multidimensional assessments of conditioning and long-term (15 d) retention. Conditioned stimuli (CSs; Gabor patches) were calibrated to differentially activate the parvocellular (P) and magnocellular (M) visual pathways, further elucidating cortical versus subcortical mechanisms. Full-blown conditioning and long-term retention emerged for M-biased CS (vs limited effects for P-biased CS), especially among anxious individuals, in all four dimensions assessed: threat appraisal (threat ratings), physiological arousal (skin conductance response), perceptual learning [discrimination sensitivity (d9) and response speed], and cortical plasticity [visual evoked potentials (VEPs) and cortical current density]. Interestingly, while behavioral, physiological, and VEP effects were comparable at immediate and delayed assessments, the cortical substrates evolved markedly over time, transferring from high-order cortices [inferotemporal/fusiform cortex and orbitofrontal cortex (OFC)] immediately to the primary and secondary visual cortex after the delay. In sum, the contrast between P-and M-biased conditioning confirms privileged conditioning acquisition via the subcortical pathway while the immediate cortical plasticity lends credence to the triadic amygdala-OFC-fusiform network thought to underlie threat processing. Importantly, long-term retention of conditioning in the basic sensory cortices supports the conserved role of the human sensory cortex in the long-term storage of aversive conditioning.

show abstract

“…This restates the common observation that transient cells deliver vigorous edge responses. The PC pathway is less suitable for such a task; insofar as low‐pass filtering of their signals occurs in the cortex, presumably in the ventral parietal pathway (Lee, 2019), this would further compound their inadequacy.…”

Section: Discussionmentioning

confidence: 99%

“…It is likely that this low-pass filtering applies to the PC (and S cone) signal as a whole, to both achromatic and chromatic components, since it is physiologically difficult to demultiplex the PC signal into luminance and chromatic components (Valberg et al 1992;Lee et al 2011), as well as being computationally expensive in a natural scene (Lee, 2019). It is unclear whether this filtering would decrease coherence rate, which would depend on the implementation of such a low-pass filter.…”

Section: Response Patterns Cell Correlation and Coherencementioning

confidence: 99%

A quantitative description of macaque ganglion cell responses to natural scenes: the interplay of time and space

Schottdorf

Lee

2021

The Journal of Physiology

View full text Add to dashboard Cite

Key points Responses to natural scenes are the business of the retina. We find primate ganglion cell responses to such scenes consistent with those to simpler stimuli. A biophysical model confirmed this and predicted ganglion cell responses with close to retinal reliability. Primate ganglion cell responses to natural scenes were driven by temporal variations in colour and luminance over the receptive field centre caused by eye movements, and little influenced by interaction of centre and surround with structure in the scene. We discuss implications in the context of efficient coding of the visual environment. Much information in a higher spatiotemporal frequency band is concentrated in the magnocellular pathway. Abstract Responses of visual neurons to natural scenes provide a link between classical descriptions of receptive field structure and visual perception of the natural environment. A natural scene video with a movement pattern resembling that of primate eye movements was used to evoke responses from macaque ganglion cells. Cell responses were well described through known properties of cell receptive fields. Different analyses converge to show that responses primarily derive from the temporal pattern of stimulation derived from eye movements, rather than spatial receptive field structure beyond centre size and position. This was confirmed using a model that predicted ganglion cell responses close to retinal reliability, with only a small contribution of the surround relative to the centre. We also found that the spatiotemporal spectrum of the stimulus is modified in ganglion cell responses, and this can reduce redundancy in the retinal signal. This is more pronounced in the magnocellular pathway, which is much better suited to transmit the detailed structure of natural scenes than the parvocellular pathway. Whitening is less important for chromatic channels. Taken together, this shows how a complex interplay across space, time and spectral content sculpts ganglion cell responses.

show abstract

Sensitivity to chromatic and luminance contrast and its neuronal substrates

Cited by 7 publications

References 50 publications

Is the pink ball still under review? Cricket umpires’ perceptions of the pink ball for day/night matches

Is the pink ball still under review? Cricket umpires’ perceptions of the pink ball for day/night matches

Human Sensory Cortex Contributes to the Long-Term Storage of Aversive Conditioning

A quantitative description of macaque ganglion cell responses to natural scenes: the interplay of time and space

Contact Info

Product

Resources

About