Impaired Flicker Detection in Visual Fields Subserved by Non-Damaged Hemispheres

Parsons, Oscar A.; Majumder, Ranjit K.; Chandler, Peter

doi:10.1016/s0010-9452(67)80019-4

Cited by 5 publications

(5 citation statements)

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“…This``method of limits' ' procedure dem onstrated that flicker detection was im paired for the visual field subserved by the damaged hem isphere in the clinical patients. Parsons et al (1967 ) also foun d that flicker detection was better for presentations to the RVF relative to the LVF for the control group. How ever, there was no evidence that LH patients were more impaired than their RH counte rparts.…”

Section: L In I C a L R E S E A R C Hmentioning

confidence: 84%

“…The discrepancy between the studies conduc ted by Parsons et al and Goldm an et al may be related to the type of patients that were used. Parsons et al (1967) used war veterans who had suffered some form of unilateral insult to the frontal, temporal, or parietal cortices. In contrast, Goldm an et al (1968) used patients with unilateral temporal lobectom ies.…”

Section: L In I C a L R E S E A R C Hmentioning

confidence: 99%

“…Thus, the inclusion of patients with damage to other areas of the brain in Parsons et al' s. (1967) study may have obscured any differences between the groups. In addition, Parsons et al (1967) used war veterans with unilateral bullet wounds. This type of insult often results in widespread dam age which, according to Parsons et al (1967, p.312), can cause:``grave difficulties in concluding from neurosurgical and neurological evidence that CNS damage is confined to one hemisphere' ' .…”

Section: L In I C a L R E S E A R C Hmentioning

confidence: 99%

“…As part of a clinical experiment, Parsons et al (1967) examined flicker fusion thresholds in a group of non-c linical adults. Th ey required subjects to attend to a light source which was clearly fused.…”

Section: G a P D E T E C T Io Nmentioning

confidence: 99%

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Temporal Processing Asymmetries Between the Cerebral Hemispheres: Evidence and Implications

Nicholls¹

1996

Laterality

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This paper reviews a large body of research which has investigated the capacities of the cerebral hemispheres to process temporal information. This research includes clinical, non-clinical, and electrophysiological experimentation. On the whole, the research supports the notion of a left hemisphere advantage for temporal resolution. The existence of such an asymmetry demonstrates that cerebral lateralisation is not limited to the higher-order functions such as language. The capacity for the resolution of fine temporal events appears to play an important role in other left hemisphere functions which require a rapid sequential processor. The functions that are facilitated by such a processor include verbal, textual, and fine movement skills. The co-development of these functions with an efficient temporal processor can be accounted for with reference to a number of evolutionary scenarios. Physiological evidence favours a temporal processing m echanism located within the left temporal cortex. The function of this mechanism may be described in terms of intermittency or travelling moment models of temporal processing. The travelling moment model provides the most plausible account of the asymmetry. IN T R O D U C T IO NTh e inherent bipartite nature of the cerebral hem ispheres has prom pted many researchers to portray hem ispheric psychological functions in terms of a dichotom ous or bipolar variable. One of the simplest and most intuitive dichotom ies describes the functions of the left and right hem ispheres in terms of their predispo sitions for the processing of verbal and non-ve rbal m aterial, respectively. Dax first noted an association between the left hem isphere (LH) and language function in the early half of the nineteenth century. This finding , published and popula rised independently by Broca in the latter half of the same LATERALITY, 1996, 1 (2), 97±137Requests for reprints should be sent to M ichael Nicholls,

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Section: L In I C a L R E S E A R C Hmentioning

confidence: 84%

Section: L In I C a L R E S E A R C Hmentioning

confidence: 99%

Section: L In I C a L R E S E A R C Hmentioning

confidence: 99%

Section: G a P D E T E C T Io Nmentioning

confidence: 99%

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Temporal Processing Asymmetries Between the Cerebral Hemispheres: Evidence and Implications

Nicholls¹

1996

Laterality

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“…A deficit following LH damage has been reported for a variety ofother tasks, including two-click fusion (Lackner & Teuber, 1973), the identification of sequences (Carmon & Nachshon, 1971), flicker fusion (Goldman, Lodge, Hammer, Semmes, & Mishkin, 1968), and the temporal integration ofsequences (Szelag, Steinbiichel, & Poppel, 1997). Although the majority of the evidence does appear to support a temporalprocessing deficit following LH damage (Nicholls, 1996), it should be noted that this support is not unanimous (Aram & Ekelman, 1988;Efron et aI., 1985;Parsons, Majumder, & Chandler, 1967). Efron (1963a) and Mills and Rollman (1980) both suggested that perceptual asymmetries for temporal processing were the result of transmission asynchronies between the hemispheres.…”

Section: +---1--t--+--+-+--olf--+--+---1--1mentioning

confidence: 99%

A left hemisphere, but not right hemispace, advantage for tactual simultaneity judgments

Nicholls

Lindell

2000

Perception & Psychophysics

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Hemispheric asymmetries for tactile simultaneity judgments were investigated in 34 dextral adults. Pairs of vibrotactile stimuli with simultaneous or successive onsets were delivered unilaterally to the left or right hand. Participants made a forced-choice, bipedal response, indicating whether a stimulus was simultaneous or successive. The effect of hemispatial attentional biases was investigated, using ipsilateral (arms uncrossed) and contralateral (arms crossed) hand placements. Trialspresented to the right hand were associated with fewer errors and a trend for faster response times than were those presented to the left hand. There was no asymmetry in response bias. Manipulations of hemispace did not affect the right hand advantage. These results confirm the existence of a left hemisphere temporal-processing advantage but fail to demonstrate that the asymmetry is the result of a rightward attentional bias. The implications ofthese results for absolute and relative models of hemispheric specialization are discussed.Efron (1963a) conducted some ofthe first work specifically testing the proposition of a left hemisphere (LH) temporal-processing advantage. Efron required participants to make simultaneity judgments for pairs of stimuli presented in either the visual or the tactile modality. The stimuli were presented bilaterally, either to the left and right hands or to the left and right visual fields. The results revealed that simultaneity thresholds were lower when the right stimulus preceded the left than for the opposite order ofpresentation. Similar right-first advantages for bilateral visual stimuli have been reported by Corballis (1996) for simultaneity judgments and by S1. John (1998) for temporal-order judgments. Within the auditory modality, Mills and Rollman (1980) required participants to make temporal order judgments for a pair of clicks delivered bilaterally to the left and right ears. Calculation of thresholds, using a method of constant stimuli, revealed that the left stimulus needed to precede the right by 4.4 msec in order for simultaneity to be perceived. Efron (1963a) and Mills and Rollman (1980) accounted for the right-first advantage with an absolute model of temporal-processing asymmetry. This model assumes that simultaneity and/or temporal order judgments are carried out exclusively in the LH. Thus, when stimuli are directed to the right side, they are transmitted directly, via the contralateral connections, to the temporal processor in the LH. Stimuli presented to the left side take a similar time to be transmitted to the right hemisphere (RH). However, there is an additional amount oftime (r) required for the message to cross the corpus callosum to reach the LH. Consequently, the time taken for stimuli presented to the left side to reach the temporal analyzer in the LH will be Correspondence concerning this article should be addressed to M.E.R. Nicholls, Department of Psychology, University of Melbourne, Parkville, VIC 3052, Australia (e-mail:m.nichoIls@psych.unimelb.edu.au).t msec longer...

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Clinical Neuropsychology

Parsons

1970

Current Topics in Clinical and Community Psychology

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Impaired Flicker Detection in Visual Fields Subserved by Non-Damaged Hemispheres

Cited by 5 publications

References 10 publications

Temporal Processing Asymmetries Between the Cerebral Hemispheres: Evidence and Implications

Temporal Processing Asymmetries Between the Cerebral Hemispheres: Evidence and Implications

A left hemisphere, but not right hemispace, advantage for tactual simultaneity judgments

Clinical Neuropsychology

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