Temporal Transfer Properties of the Afferent Visual System Psychophysical,Neurophysiological and Theoretical Investigations

Grind, W. A. van de; Grüsser, O.‐J.; Lunkenheimer, H.-U.

doi:10.1007/978-3-642-65352-0_7

Cited by 46 publications

(27 citation statements)

References 419 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Their loss is at more moderate rates, at which normals can see not only that a light is¯ickering but also that it is either on or off at each given moment. This ability to individuate the successive states of the light gives way to an experience of steady¯icker at a frequency of 8 Hz or so in normals, and this threshold rate is called the Gestalt¯icker fusion rate (van de Grind et al, 1973). Above this limit of 7±10 Hz, subjects cannot perform attentive tracking, report the direction of apparent motion, or make phase judgements for widely spaced items (Forte et al, 1999;Verstraten et al, 2000;Victor and Conte, 2002).…”

Section: Discussioncontrasting

confidence: 39%

“…Detecting the rapid changes of¯icker is not the same as experiencing each light and dark phase of the¯icker as individual events, a percept referred to as Gestalt¯icker (van de Grind et al, 1973) and having a much lower threshold rate (7±8 Hz; Verstraten et al, 2000). The parietal patients may have preserved the detection of¯icker but suffered a loss in the rate at which they can individuate events with attention.…”

Section: Experiments 3: Testing Different Phase Shiftscontrasting

confidence: 40%

See 1 more Smart Citation

Bilateral deficits of transient visual attention in right parietal patients

Battelli¹,

Cavanagh²,

Martini³

et al. 2003

Brain

View full text Add to dashboard Cite

SummaryVision tells us not only what and where objects are but also when they appear and disappear. We have found that patients with right parietal damage have an unusual loss in the ability to differentiate object onset from offset. Speci®cally, when a single target¯ickers at the same frequency as ®ve distractors, but out of phase (it is light when they are dark and vice versa), right parietal patients require much slower rates than normals or left parietal patients to detect the target.When we shifted the phase of the¯icker in the target relative to the distractors so that the onsets and offsets were not simultaneous, the performance of the patients improved dramatically. Remarkably, the patients showed this loss equally in both visual ®elds. Sincē icker detection was normal for the patients, we suggest that the de®cit lies at a level where stimulus transients are interpreted as the appearance or disappearance of objects.

show abstract

Section: Discussioncontrasting

confidence: 39%

Section: Experiments 3: Testing Different Phase Shiftscontrasting

confidence: 40%

Bilateral deficits of transient visual attention in right parietal patients

Battelli¹,

Cavanagh²,

Martini³

et al. 2003

Brain

View full text Add to dashboard Cite

show abstract

“…In order to obtain the same light intensity for both functions, the square wave had to have a slightly lower modulation (60%) than the sine wave (100%). Nevertheless, this is not likely to have had an important effect on the results as modulation down to even 35% is only expected to have a slight effect on CFF values (van de Grind et al, 1973). The aim of using the two different functions was to confirm that flickering stimuli produced by slightly different methods result in similar estimates of CFF.…”

Section: Discussionsupporting

confidence: 38%

The presence of UV wavelengths improves the temporal resolution of the avian visual system

Rubene

Håstad

Tauson

et al. 2010

Journal of Experimental Biology

View full text Add to dashboard Cite

SUMMARYThe ability to perceive rapid movement is an essential adaptation in birds, which are involved in rapid flight, pursuing prey and escaping predators. Nevertheless, the temporal resolution of the avian visual systems has been less well explored than spectral sensitivity. There are indications that birds are superior to humans in their ability to detect movement, as suggested by higher critical flicker frequencies (CFFs). It has also been implied, but not properly tested, that properties of CFF, as a function of light intensity, are affected by the spectral composition of light. This study measured CFF in the chicken, Gallus gallus L., using four different light stimuli -white, full-spectrum (white with addition of UV), yellow (590nm) and UV (400nm) -and four light intensity levels, adjusted to relative cone sensitivity. The results showed significantly higher CFF values for full-spectrum compared with white light, as well as a steeper rate of increase with intensity. The presence of UV wavelengths, previously demonstrated to affect mate choice and foraging, appears to be important also for detection of rapid movement. The yellow and UV light stimuli yielded rather similar CFFs, indicating no special role for the double cone in flicker detection.

show abstract

“…For example, subjects can detect the presence of rapid flicker at rates up to 60 Hz or more. However, if subjects are asked to discriminate between the light and dark phase of the flicker as individual events (a percept referred to as Gestalt flicker), the maximum rate is an order of magnitude lower, 6 to 8 Hz [34].…”

Section: Discriminating the Order Of Visual Eventsmentioning

confidence: 46%

The ‘when’ pathway of the right parietal lobe

Battelli

Pascual‐Leone

Cavanagh

2007

Trends in Cognitive Sciences

211

148

View full text Add to dashboard Cite

The order of events, whether two events are seen as simultaneous or successive, sets the stage for the moment-to-moment interpretation of the visual world. Evidence from patients who have lesions to the parietal lobes and transcranial magnetic stimulation studies in normal subjects suggest that the right inferior parietal lobe underlies this analysis of event timing. Judgment of temporal order, simultaneity and high-level motion are all compromised following right parietal lesions and degraded after transcranial magnetic stimulation over the right parietal but not elsewhere. The results suggest that the right parietal lobe serves as part of a when pathway for both visual fields. We propose that the disruption of this mechanism is the underlying cause of a wide range of seemingly unrelated tasks being impaired in right parietal patients.

show abstract

Temporal Transfer Properties of the Afferent Visual System Psychophysical,Neurophysiological and Theoretical Investigations

Cited by 46 publications

References 419 publications

Bilateral deficits of transient visual attention in right parietal patients

Bilateral deficits of transient visual attention in right parietal patients

The presence of UV wavelengths improves the temporal resolution of the avian visual system

The ‘when’ pathway of the right parietal lobe

Contact Info

Product

Resources

About