Keeping It Short

Wiens, Stefan; Fransson, Peter; Dietrich, Thomas; Lohmann, Peter; Ingvar, Martin; Öhman, Annelie Bränström

doi:10.1111/j.0956-7976.2004.00667.x

Cited by 45 publications

(41 citation statements)

References 9 publications

(7 reference statements)

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“…A limitation of LCD projectors, which are easier to adapt to MR environments, is that they provide less precise control over the timing of visual presentation than traditional CRT displays. Nonetheless, recent studies have shown that LCD projectors still provide a high correspondence between desired and actual target durations, with trial-by-trial variability on the order of ϳ5 ms (Wiens et al 2004). Using a photodiode connected to an oscilloscope, we confirmed that our LCD projector was able to present changes in luminance up to the highest presentation rates used in the study (37.5 Hz).…”

Section: Experimental Design and Stimulisupporting

confidence: 76%

Temporal Limitations in Object Processing Across the Human Ventral Visual Pathway

McKeeff¹,

Remus²,

Tong³

2007

Journal of Neurophysiology

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. Behavioral studies have shown that object recognition becomes severely impaired at fast presentation rates, indicating a limitation in temporal processing capacity. Here, we studied whether this behavioral limit in object recognition reflects limitations in the temporal processing capacity of early visual areas tuned to basic features or high-level areas tuned to complex objects. We used functional MRI (fMRI) to measure the temporal processing capacity of multiple areas along the ventral visual pathway progressing from the primary visual cortex (V1) to high-level object-selective regions, specifically the fusiform face area (FFA) and parahippocampal place area (PPA). Subjects viewed successive images of faces or houses at presentation rates varying from 2.3 to 37.5 items/s while performing an object discrimination task. Measures of the temporal frequency response profile of each visual area revealed a systematic decline in peak tuning across the visual hierarchy. Areas V1-V3 showed peak activity at rapid presentation rates of 18 -25 items/s, area V4v peaked at intermediate rates (9 items/s), and the FFA and PPA peaked at the slowest temporal rates (4 -5 items/s). Our results reveal a progressive loss in the temporal processing capacity of the human visual system as information is transferred from early visual areas to higher areas. These data suggest that temporal limitations in object recognition likely result from the limited processing capacity of high-level object-selective areas rather than that of earlier stages of visual processing.

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Section: Experimental Design and Stimulisupporting

confidence: 76%

Temporal Limitations in Object Processing Across the Human Ventral Visual Pathway

McKeeff¹,

Remus²,

Tong³

2007

Journal of Neurophysiology

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“…7; see also Liang & Badano, 2007;Wiens et al, 2004), the present estimates highlight the substantial improvement in temporal response characteristics brought about by overdrive technology. For example, our estimated rise time of 1-6 ms is considerably shorter than estimates obtained without overdrive (2-25 ms in our estimates, 20-150 ms in past research; Liang & Badano, 2007;Wiens et al, 2004) and approaches that of CRTs (<1 ms). Clearly, recent advances in LCD technology have resulted in a substantial reduction in response times, making LCD screens suitable for presenting brief displays.…”

Section: General Discussion and Conclusionsupporting

confidence: 50%

“…Earlier estimates of the time to reach maximum luminance in LCD screens have ranged up to 47 ms for black-to-white transitions (Wiens et al, 2004) and up to 150 ms for gray-togray transitions (Liang & Badano, 2007). Those estimates, however, were obtained before the advent of overdrive technology, which boosts the voltage applied to the liquid crystals, thereby markedly improving the temporal response characteristics of LCD screens.…”

Section: Part Ii: Photometric Estimates Of Luminancementioning

confidence: 99%

LCDs are better: Psychophysical and photometric estimates of the temporal characteristics of CRT and LCD monitors

Lagroix

Yanko

Spalek

2012

Atten Percept Psychophys

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Many cognitive and perceptual phenomena, such as iconic memory and temporal integration, require brief displays. A critical requirement is that the image not remain visible after its offset. It is commonly believed that liquid crystal displays (LCD) are unsuitable because of their poor temporal response characteristics relative to cathode-raytube (CRT) screens. Remarkably, no psychophysical estimates of visible persistence are available to verify this belief. A series of experiments in which white stimuli on a black background produced discernible persistence on CRT but not on LCD screens, during both dark-and light-adapted viewing, falsified this belief. Similar estimates using black stimuli on a white background produced no visible persistence on either screen. That said, photometric measurements are available that seem to confirm the poor temporal characteristics of LCD screens, but they were obtained before recent advances in LCD technology. Using current LCD screens, we obtained photometric estimates of rise time far shorter (1-6 ms) than earlier estimates (20-150 ms), and approaching those of CRTs (<1 ms). We conclude that LCDs are preferable to CRTs when visible persistence is a concern, except when black-on-white displays are used.

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“…The response time also differs depending on the target gray levels (Elze & Tanner, 2009;Liang & Badano, 2007). Wiens et al (2004) suggested that LCDs (earlier than 2004) were not suitable for psychological experiments requiring high temporal precision in stimulus presentations. They compared the temporal accuracy of an LCD with that of a raster scan CRT display by manipulating the duration of stimulus presentations from 8 to 200 msec and found that the LCD provided poor accuracy: Specifically, the LCD failed to present a target on some trials.…”

mentioning

confidence: 99%

Usability of liquid crystal displays for research in the temporal characteristics of perception and attention

Kihara

Kawahara

Takeda

2010

Behavior Research Methods

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Recently, the use of liquid crystal displays (LCDs) in computer monitors has increased in popularity. Can LCDs produce results similar to those obtained in cathode-ray tube (CRT) displays in studies of temporal attention and perception tasks? Performance in two tasks (metacontrast masking and attentional blink) was examined using an LCD, a CRT oscilloscope, and a raster scan CRT display. Experiment 1 focused on metacontrast masking where a typical metacontrast function emerged irrespective of monitor type. Experiments 2 and 3 examined whether differences in monitors influence the attentional blink. Again, all displays elicited similar performance profiles for both the attentional blink and the trade-off between identification accuracy of the two targets. Although our results may not generalize to all LCD applications and all experimental paradigms, they indicate that LCDs can reproduce results similar to those found in metacontrast masking and attentional blink studies that were originally identified with CRT displays.

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Keeping It Short

Cited by 45 publications

References 9 publications

Temporal Limitations in Object Processing Across the Human Ventral Visual Pathway

Temporal Limitations in Object Processing Across the Human Ventral Visual Pathway

LCDs are better: Psychophysical and photometric estimates of the temporal characteristics of CRT and LCD monitors

Usability of liquid crystal displays for research in the temporal characteristics of perception and attention

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