Influence of Microsaccades on Contrast Sensitivity: Theoretical Analysis and Experimental Results

Mostofi, Naghmeh; Boi, Marco; Rucci, Michele

doi:10.1167/14.10.109

Cited by 4 publications

(3 citation statements)

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“…A recent study that specifically measured contrast thresholds in the presence and absence of microsaccades found no differences between these two conditions neither at low nor high spatial frequencies (Mostofi et al, 2014). …”

Section: Visual Functions Of Microsaccadesmentioning

confidence: 99%

A compact field guide to the study of microsaccades: Challenges and functions

2016

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Following a period of quiescence at the end of last century, the study of microsaccades has now regained strong impetus and broad attention within the vision research community. This new wave of interest, partly fueled by the advent of a new generation of high-resolution eyetrackers, has attracted new researchers and led to new ideas. Old hypothesis have been revisited and new ones formulated. This article is designed to serve as a practical guide for researchers in the field. Because of the history of the field and the difficulty of measuring very small eye movements, the study of microsaccades presents peculiar challenges. Here, we summarize some of the main challenges and describe methods for assessing and improving the quality of the recordings. Furthermore, we examine how these experimental challenges have influenced analysis of the visual functions of microsaccades and critically review current evidence on three long-debated proposals: the maintenance of fixation, the prevention of visual fading, and the exploration of fine spatial detail.

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Section: Visual Functions Of Microsaccadesmentioning

confidence: 99%

A compact field guide to the study of microsaccades: Challenges and functions

2016

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“…( D ) Mean amplification resulting from ocular drift as a function of spatial frequency. Data represent averages across N =5 observers [78]. ( E ) Same as in C after adjusting contrasts to match the structure of natural images.…”

Section: Figurementioning

confidence: 99%

The unsteady eye: an information-processing stage, not a bug

Rucci

Victor

2015

Trends in Neurosciences

185

178

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How is space represented in the visual system? At first glance, the answer to this fundamental question appears straightforward: spatial information is directly encoded in the locations of neurons within maps. This concept has long dominated visual neuroscience, leading to mainstream theories of how neurons encode information. However, an accumulation of evidence indicates that this purely spatial view is incomplete, and that even for static images, the representation is fundamentally spatiotemporal. The evidence for this new understanding centers on recent experimental findings concerning the functional role of fixational eye movements, the tiny movements humans and other species continually perform, even when attending to a single point. Here, we review some of these findings and discuss their functional implications.

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“…( B ) Mean amplification resulting from ocular drift as a function of spatial frequency. Data represent averages across N =5 observers (Mostofi, Boi & Rucci 2014). ( C ) Results of experiments in which subjects judged the orientation of a noisy grating (±45° either at low or high spatial frequency) in the presence (normal) and absence (stabilized) of normal fixational eye movements.…”

Section: Figurementioning

confidence: 99%

Control and Functions of Fixational Eye Movements

Rucci

Poletti

2015

Annu. Rev. Vis. Sci.

183

151

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Humans and other species explore a visual scene by rapidly shifting their gaze 2-3 times every second. Although the eyes may appear immobile in the brief intervals in between saccades, microscopic (fixational) eye movements are always present, even when attending to a single point. These movements occur during the very periods in which visual information is acquired and processed and their functions have long been debated. Recent technical advances in controlling retinal stimulation during normal oculomotor activity have shed new light on the visual contributions of fixational eye movements and their degree of control. The emerging body of evidence, reviewed in this article, indicates that fixational eye movements are important components of the strategy by which the visual system processes fine spatial details, enabling both precise positioning of the stimulus on the retina and encoding of spatial information into the joint space-time domain.

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Influence of Microsaccades on Contrast Sensitivity: Theoretical Analysis and Experimental Results

Cited by 4 publications

References 0 publications

A compact field guide to the study of microsaccades: Challenges and functions

A compact field guide to the study of microsaccades: Challenges and functions

The unsteady eye: an information-processing stage, not a bug

Control and Functions of Fixational Eye Movements

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