The two-dimensional shape of spatial interaction zones in the parafovea

Toet, Alexander; Levi, Dennis M.

doi:10.1016/0042-6989(92)90227-a

Cited by 521 publications

(639 citation statements)

References 40 publications

Supporting

Mentioning

553

Contrasting

Unclassified

Order By: Relevance

“…The mean extent of interaction is 8 deg, roughly 0.5 times the eccentricity (16.5 deg) of the test stimulus. These extents of contour interaction are similar to those that have been reported in other studies of peripheral vision (Bouma, 1970;Andriessen & Bouma, 1976;Toet & Levi, 1992;Kooi et al, 1994). Clearly, the extent of dichoptic contour interaction in the region corresponding to the contralateral eye's blind spot is comparable to the extents of contour interaction seen at similar eccentricities in other regions of the visual field.…”

Section: )/ (Sw (2)*ad) -1)/u (1)supporting

confidence: 90%

“…It has been reported in a variety of visual tasks, e.g. letter discrimination (Bouma, 1970;Toet & Levi, 1992;Nazir, 1992), tilt discrimination (Andriessen & Bouma, 1976;Westheimer, Shimamura & McKee, 1976) and vernier acuity (Westheimer & Hauske, 1975;Levi, Klein & Aitsebaomo, 1985). It is believed to be a cortical phenomenon because performance is seen to be similar when flanking contours are placed in either the same eye as the test stimulus or in the opposite eye (Flom, Heath & Takahashi, 1963;Westheimer & Hauske, 1975).…”

Section: Blind Spot Contour Interaction Long-range Horizontal Connectmentioning

confidence: 96%

“…The goal of the present study is to test psychophysically whether binocular interactions exist in the region of the cortex that corresponds to the blind spot in humans by measuring dichoptic contour interaction using stimuli that would be expected to stimulate this "monocular" cortical region, Visual perfo~ance is degraded when additional contours are placed in the neighborhood of the stimulus used to measure ~rfo~ance, This degradation of performance in the presence of flanking contours is termed contour interaction (Flom, Weymouth & Kahneman, 1963;Bouma, 1970). Contour interaction extends radially from the test stimulus as far as half the eccentricity of the test stimulus (Bouma, 1970;Andriessen & Bouma, 1976;Toet & Levi, 1992). It has been reported in a variety of visual tasks, e.g.…”

Section: Blind Spot Contour Interaction Long-range Horizontal Connectmentioning

confidence: 99%

See 2 more Smart Citations

Long-range dichoptic interactions in the human visual cortex in the region corresponding to the blind spot

Tripathy

Levi

1994

Vision Research

Self Cite

View full text Add to dashboard Cite

Tbe region of tbe visual field of one eye tbat corresponds to tbe blind spot of the coutraIatera1 eye is beiieved to be monocular. We measured dicboptic coatour interaction in this region of tbe visual field in bumans by having observers report tbe orientation of a test letter "T" presenH to tbis region, in the presence of thud&g T's presented around tbe blind spot of the fellow eye. A large drop in performance was seen because of tbe Bauks, showing clearly tbe existence of dicboptic contour interaction in this 'cmonocular" region of tbe visual field. Tbis suggests that the cortical representatioa of the region of tbe visual field tbat corresponds to the -t&ate& eye's blind spot is sot strictly monocular. Tbe absence of direct retinal aiferents from oue eye to tbis region of cortex swggests tbe involvement of horizontal cortical connectious in tbe contour interaction phenomenon. Our estimates of the extent of contour interaction in mm of striate cortex are comparable to the reported lengths of the long-range horizontal connections in tbe striate cortex of monkeys. Our results are consistent with the proposition that long-range horizontal conuections of the striate cortex may mediate the eontour interaction p~~rnenon.

show abstract

Section: )/ (Sw (2)*ad) -1)/u (1)supporting

confidence: 90%

Section: Blind Spot Contour Interaction Long-range Horizontal Connectmentioning

confidence: 96%

Section: Blind Spot Contour Interaction Long-range Horizontal Connectmentioning

confidence: 99%

See 1 more Smart Citation

Long-range dichoptic interactions in the human visual cortex in the region corresponding to the blind spot

Tripathy

Levi

1994

Vision Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…Studies of crowding (Bouma, 1970;Pelli et al, 2007;Toet & Levi, 1992) have indicated that the letters in our experiments-presented at a retinal eccentricity of 6.0°-should be free from crowding when separated by about 3.0° or more. In fact, they were separated by 8.5° (see Figure 1a), suggesting that crowding played no appreciable role in either condition.…”

Section: A Bilateral Advantage?mentioning

confidence: 59%

“Pseudoextinction”: Asymmetries in simultaneous attentional selection.

Goodbourn

Holcombe

2015

Journal of Experimental Psychology: Human Perception and Perfor

117

View full text Add to dashboard Cite

We report robust visual-field asymmetries associated with selecting simultaneous targets. One letter embedded in a rapid serial visual presentation (RSVP) of letters was encircled by a white ring, cueing it as the target to report. In some conditions, 2 RSVP streams were presented concurrently, and targets appeared simultaneously in both. When only 1 stream was cued, performance was similar regardless of whether it was in the left or right visual field. Cueing 2 streams barely affected performance in the left stream, but performance in the right stream suffered markedly. We term this phenomenon pseudoextinction, by analogy to pseudoneglect whereby observers bisect lines to the left of center. Such attentional asymmetries are often believed to originate from a processing imbalance between the 2 cerebral hemispheres. But pseudoextinction also occurred with vertically arrayed streams, with higher efficacy in the superior than in the inferior stream. Mixture modeling of errors indicated that pseudoextinction did not affect the temporal precision or latency of selection episodes; rather, only the efficacy of selection suffered. These findings lead us to suggest that pseudoextinction arises because perceptual traces are activated simultaneously in a visual buffer, but must be tokenized serially. Observers succeed in selecting simultaneous targets because trace activation occurs in parallel. However, observers often fail to report both targets because tokenization proceeds serially: While 1 target is being tokenized, the other’s trace may decay below the activation level necessary for tokenization.

show abstract

“…Pada skala ini, saiz zon interaksi kelihatan serupa untuk kedua-dua kumpulan subjek. Ciri kualitatif zon interaksi ini adalah hampir sama seperti yang telah dilaporkan untuk subjek normal sebelum ini (Toet & Levi 1992).…”

Section: Uji Kaji 2: Akuiti Periferi Subjek Normal Yang Dikaburkan Peunclassified

Perbandingan Zon Interaksi Ruang Dua Dimensi Subjek Normal dan Ambliopia Anisometropik

Hairol¹,

Latif

Woi

et al. 2017

JSM

View full text Add to dashboard Cite

show abstract

The two-dimensional shape of spatial interaction zones in the parafovea

Cited by 521 publications

References 40 publications

Long-range dichoptic interactions in the human visual cortex in the region corresponding to the blind spot

Long-range dichoptic interactions in the human visual cortex in the region corresponding to the blind spot

“Pseudoextinction”: Asymmetries in simultaneous attentional selection.

Perbandingan Zon Interaksi Ruang Dua Dimensi Subjek Normal dan Ambliopia Anisometropik

Contact Info

Product

Resources

About