Temporal frequency discrimination above threshold

Mandler, Marc B.

doi:10.1016/0042-6989(84)90020-8

Cited by 42 publications

(19 citation statements)

References 27 publications

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“…In this respect, we were careful not to choose a frequency at which the blinking object might be perceptually treated as one and the same object across frames (i.e., faster than once every 100 ms; Yantis & Gibson, 1994), a point to which we will return in the General Discussion. Finally, psychophysical studies have shown that observers are quite sensitive to frequency and phase differences below 10 Hz (as used in the present study), with relative difference thresholds of around 0.1 (Mandler, 1984;Mowbray & Gebhard, 1955; see also Forte, Hogben, & Ross, 1999). This means that observers should be able to distinguish the 50-ms differences between rates.…”

Section: Discussionsupporting

confidence: 56%

When is search for a static target among dynamic distractors efficient?

Pinto¹,

Olivers²,

Theeuwes³

2006

Journal of Experimental Psychology: Human Perception and Perfor

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Intuitively, dynamic visual stimuli, such as moving objects or flashing lights, attract attention. Visual search tasks have revealed that dynamic targets among static distractors can indeed efficiently guide attention. The present study shows that the reverse case, a static target among dynamic distractors, allows for relatively efficient selection in certain but not all cases. A static target was relatively efficiently found among distractors that featured apparent motion, corroborating earlier findings. The important new finding was that static targets were equally easily found among distractors that blinked on and off continuously, even when each individual item blinked at a random rate. However, search for a static target was less efficient when distractors abruptly varied in luminance but did not completely disappear. The authors suggest that the division into the parvocellular pathway dealing with static visual information, on the one hand, and the magnocellular pathway common to motion and new object onset detection, on the other hand, allows for efficient filtering of dynamic and static information.

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Section: Discussionsupporting

confidence: 56%

When is search for a static target among dynamic distractors efficient?

Pinto¹,

Olivers²,

Theeuwes³

2006

Journal of Experimental Psychology: Human Perception and Perfor

View full text Add to dashboard Cite

show abstract

“…One remaining question concerning the patient's residual motion perception is whether it is best represented in terms of temporal frequency or velocity. The similarity of the results in Figure 11, A, B leave this matter unresolved since grating data 100 from Hess and Plant (1985) and Mandler (1984).…”

Section: Resultsmentioning

confidence: 93%

“…At low temporal frequencies, the discriminable step size is on the order of 50% of the base frequency. This declines to around 8% in the intermediate temporal frequency range (2-10 Hz) and then increases again in the higher frequency range (Mandler, 1984;Hess and Plant, 1985). This is schematically illustrated by the dash-dot lines in Figure 8.…”

Section: Resultsmentioning

confidence: 99%

The "motion-blind" patient: low-level spatial and temporal filters

1989

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The “motion-blind” patient previously described by Zihl et al. (1983) was investigated using standard psychophysical procedures with stimuli whose spatial and temporal properties could be separately manipulated. Detection experiments for sinewave grating stimuli of varying spatial and temporal frequency showed sensitivity in this patient to be only slightly impaired. Temporal integration for stimuli of varying spatiotemporal frequency exhibited the expected space-time covariation seen in normal vision. An examination of the suprathreshold discriminative capacity of this patient was undertaken for spatial frequency, contrast, and temporal frequency. Although all of these discriminative functions were impaired, those concerning temporal frequency or velocity were dramatically reduced. No similar loss was seen for spatial frequency discrimination for moving or temporally varying stimuli. No measurable temporal frequency discrimination was present above 6 Hz and no velocity discrimination above 6 degrees/sec. Experiments involving the direction discrimination of suprathreshold drifting gratings of arrays of random dots revealed an inability to perceive direction of movement above a velocity of about 6 degrees/sec. Contrast thresholds contingent on direction of motion of a drifting grating also showed a much greater deficit than simple detection. Apparent motion using 2-flash random dot kinematograms revealed that the residual motion vision of this patient corresponded to the “short- range” motion process of normal vision. This process originally defined by Braddick (1974) operates over restricted space and time intervals. Apparent motion could only be supported by a narrow range of intermediate spatial displacements. These results suggest that this patient does exhibit some residual motion perception, probably corresponding to a severely impaired “short-range” mechanism. The patient's relatively intact ability to perform simple types of discrimination but severe impairment of performance at making judgments relevant to the nature of motion of the same stimuli suggests that while the components necessary for the analysis of motion are intact their more global associations have been disrupted. This implicates an extrastriate locus of the brain damage. Alternative explanations for the nature of the deficit are discussed.

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“…With respect to the overall results a great deal of uniformity across subjects was verified, indicating that particular organ systems react in an increasingly characteristic way once the stress is high. Emotions can be considered the result of two major components: a physiological arousal, which prepares the action and cognitive assessment of the environmental situation, which drives the behavioral response of the subject [52]. State anxiety, typical of sport situation, is the tendency to perceive competitive situations as dangerous and to respond accordingly with feelings of tension and apprehension [53].…”

Section: Discussionmentioning

confidence: 99%