An investigation into hemisphere differences in adaptation to contrast

Rose, David

doi:10.3758/bf03205901

Cited by 18 publications

(14 citation statements)

References 51 publications

(56 reference statements)

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“…No significant differences between the two visual fields were found in the other 3 observers, and we therefore conclude that there is identical contrast sensitivity in the RVF and LVF. These results confirm the published fmdings of Fiorentini and Berardi (1984), Kitterle and Kaye (1985), and Rose (1983), and suggest that any nasal-temporal differences in contrast sensitivity balance out when stimuli are viewed binocularly.…”

Section: Resultssupporting

confidence: 81%

“….50 Whitman, 1981), most investigators report no differences (Beaton & Blakemore, 1981;Blake & Mills, 1979;Delis, Robertson, & Efron, 1986;Fiorentini & Berardi, 1984;Kitterle & Kaye, 1985;Rijsdijk, Kroon, & van der Wildt, 1980;Rose, 1983;Szelag, Budohoska, & Koltuska, 1987;Vassilev, Verskaya, Manahilov, Mitov, & Leushina, 1985). Kitterle (1986) provides a review of this literature.…”

mentioning

confidence: 99%

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Spatial frequencies and the cerebral hemispheres: Contrast sensitivity, visible persistence, and letter classification

Peterzell

Harvey

Hardyck

1989

Perception & Psychophysics

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Section: Resultssupporting

confidence: 81%

mentioning

confidence: 99%

Spatial frequencies and the cerebral hemispheres: Contrast sensitivity, visible persistence, and letter classification

Peterzell

Harvey

Hardyck

1989

Perception & Psychophysics

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“…One possibility is to assume that simple detection occurs at a sensory level; therefore, hemispheric differences would arise only when some higher level processing of the input is required (e.g., discrimination, identification). Differences in hemispheric processing tend to occur in psychophysical tasks that require relatively extensive computation by the visual system (Christman, 1988;Cohen, 1982;Greenwood, Rotkin, Wilson, & Gazzaniga, 1980;Kitterle, 1986;Rose, 1983). Thus, if hemispheric differences depend on computational processes that monitor and compare the output of different spatial frequency channels, one might expect to find laterality effects in spatial frequency discrimination and identification tasks.…”

Section: Strategy 2: Simple Stimulimentioning

confidence: 99%

“…The detection of a grating is a relatively simple task. Perhaps hemispheric asymmetries arise only when there is a limited capacity for handling information or for allocating attention (Rose, 1983). In addition, the detection of a grating may occur relatively early in processing.…”

Section: Strategy 2: Simple Stimulimentioning

confidence: 99%

Hemispheric differences are found in the identification, but not the detection, of low versus high spatial frequencies

Kitterle

Christman

Hellige

1990

Perception & Psychophysics

154

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The processing of sine-wave gratings presented to the left and right visual fields was examined in four experiments. Subjects were required either to detect the presence of a grating (Experiments 1 and 2) or to identify the spatial frequency of a grating (Experiments 3 and 4). Orthogonally to this, the stimuli were presented either at threshold levels of contrast (Experiments 1 and 3) or at suprathreshold levels (Experiments 2 and 4). Visual field and spatial frequency interacted when the task required identification of spatial frequency, but not when it required only stimulus detection. Regardless of contrast level (threshold, suprathreshold), high-frequency gratings were identified more readily in the right visual field (left hemisphere), whereas low-frequency gratings showed no visual field difference (Experiment 3) or were identified more readily in the left visual field (right hemisphere) (Experiment 4). Thus, hemispheric asymmetries in the processing of spatial frequencies depend on the task. These results support Sergent's (1982) spatial frequency hypothesis, but only when the computational demands of the task exceed those required for the simple detection of the stimuli.Perceptual characteristics of input, as well as cognitive characteristics of task, have been shown (by, e.g., Sergent & Hellige, 1986) to influence obtained patterns of cerebral asymmetry. Sergent (1982Sergent ( , 1983 proposed that the right visual field/left hemisphere (RVF/LH) is specialized for the perceptual processing of higher spatial frequencies, and that the left visual field/right hemisphere (LVF /RH) is specialized for the processing of lower spatial frequencies. Two general strategies, one involving complex stimuli and the other, simple stimuli, have been employed in testing this hypothesis, and each strategy will be discussed below in turn. Strategy 1: Complex StimuliFirst, some researchers have used complex stimuli (e.g., alphanumeric characters, faces) and have varied input characteristics (e.g., size, eccentricity, luminance, exposure duration) in order to vary the proportion of high and low frequencies in the input. When Christman (1989) reviewed such studies, he found moderate support for the spatial frequency hypothesis. However, the manipulations used in these studies have only crude and/or indirect effects on the spatial frequency content of the input, and thus they cannot be considered simple or straightforward manipulations of spatial frequency as opposed to other input variables (e.g., stimulus perceptibility; see Michimata & Hellige, 1987).In only four studies have quantitative forms of spatial filtering been employed to directly test the spatial frequency hypothesis. Sergent (1985) presented clear versus low-pass blurred faces and found, as predicted by the hypothesis, that low-pass blurring produced greater relative LH impairment. In a similar experiment, however, Sergent (1987) obtained an LH advantage with broad-pass faces and no hemispheric differences with low-pass faces. Christman (1990) used dioptric blur...

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“…Iyzed in terms of their spatial-frequency Fourier components, there have been recent attempts to account for asymmetries at early stages in the processing of visual information in terms of differences in the sensitivity of the cerebral hemispheres to orientation and spatial frequency (Beaton & Blakemore, 1981;Rao, Rourke, & Whitman, 1981;Rose, 1983;Rovamo & Virsu, 1979;Sergent, 1982aSergent, , 1982bSergent, , 1982cSergent, , 1983aSergent, , 1983bTei & Owen, 1980). An important implication of this work is that the nature of the visual input may play an important role in processing asymmetries (Sergent, 1983b).…”

mentioning

confidence: 99%