scholarly journals Effects of spatial attention on disparity thresholds in detecting dual targets in the central and peripheral visual field

2010 ◽  
Vol 8 (17) ◽  
pp. 81-81
Author(s):  
M. Sato ◽  
K. Uchikawa
Keyword(s):  
Visual Field ◽  
Spatial Attention ◽  
Peripheral Visual Field

Spatial Frequency and Selective Attention to Spatial Location

Perception ◽  
1987 ◽  
Vol 16 (1) ◽  
pp. 103-111 ◽  
Author(s):  
Gordon L Shulman ◽  
James Wilson
Keyword(s):  
Visual Field ◽  
Selective Attention ◽  
Spatial Frequency ◽  
Spatial Attention ◽  
Spatial Location ◽  
Peripheral Visual Field ◽  
Low Frequencies ◽  
Full Field ◽  
High Frequencies ◽  
Probe Technique

The effect of spatial attention on the detectability of gratings of different spatial frequency was measured using a probe technique. Three experiments are reported in which the detectability of full-field probe gratings was measured while subjects analyzed stimuli presented in either the central or the peripheral visual field. Selective attention to peripheral stimuli produced a facilitation at low frequencies and a decrement at high frequencies. These effects disappeared under forced-choice presentation.

On Why Objects Appear Smaller in the Visual Periphery

2019 ◽  
Vol 31 (1) ◽  
pp. 88-96 ◽  
Author(s):  
Wladimir Kirsch ◽  
Roland Pfister ◽  
Wilfried Kunde
Keyword(s):  
Visual Field ◽  
Visual System ◽  
Structural Properties ◽  
Spatial Attention ◽  
Visuospatial Attention ◽  
Peripheral Target ◽  
Perceptual Distortion ◽  
Visual Periphery ◽  
Peripheral Location ◽  
Exogenous Cue

An object appears smaller in the periphery than in the center of the visual field. In two experiments ( N = 24), we demonstrated that visuospatial attention contributes substantially to this perceptual distortion. Participants judged the size of central and peripheral target objects after a transient, exogenous cue directed their attention to either the central or the peripheral location. Peripheral target objects were judged to be smaller following a central cue, whereas this effect disappeared completely when the peripheral target was cued. This outcome suggests that objects appear smaller in the visual periphery not only because of the structural properties of the visual system but also because of a lack of spatial attention.

Occipitoparietal alpha-band responses to the graded allocation of top-down spatial attention

2014 ◽  
Vol 112 (6) ◽  
pp. 1307-1316 ◽  
Author(s):  
Isabel Dombrowe ◽  
Claus C. Hilgetag
Keyword(s):  
Visual Field ◽  
Spatial Attention ◽  
Brain Regions ◽  
Alpha Band ◽  
Top Down ◽  
Attentional Resources ◽  
Parietal Lobes ◽  
Visual Spatial ◽  
Entire Visual Field ◽  
Band Activity

The voluntary, top-down allocation of visual spatial attention has been linked to changes in the alpha-band of the electroencephalogram (EEG) signal measured over occipital and parietal lobes. In the present study, we investigated how occipitoparietal alpha-band activity changes when people allocate their attentional resources in a graded fashion across the visual field. We asked participants to either completely shift their attention into one hemifield, to balance their attention equally across the entire visual field, or to attribute more attention to one-half of the visual field than to the other. As expected, we found that alpha-band amplitudes decreased stronger contralaterally than ipsilaterally to the attended side when attention was shifted completely. Alpha-band amplitudes decreased bilaterally when attention was balanced equally across the visual field. However, when participants allocated more attentional resources to one-half of the visual field, this was not reflected in the alpha-band amplitudes, which just decreased bilaterally. We found that the performance of the participants was more strongly reflected in the coherence between frontal and occipitoparietal brain regions. We conclude that low alpha-band amplitudes seem to be necessary for stimulus detection. Furthermore, complete shifts of attention are directly reflected in the lateralization of alpha-band amplitudes. In the present study, a gradual allocation of visual attention across the visual field was only indirectly reflected in the alpha-band activity over occipital and parietal cortexes.

scholarly journals Evaluation of Central and Peripheral Visual Field Concordance in Glaucoma

2016 ◽  
Vol 57 (6) ◽  
pp. 2797 ◽  
Author(s):  
Jamie L. Odden ◽  
Aleksandra Mihailovic ◽  
Michael V. Boland ◽  
David S. Friedman ◽  
Sheila K. West ◽  
...  
Keyword(s):  
Visual Field ◽  
Peripheral Visual Field

scholarly journals Cortical responses to moderate- and high-speed gratings extending 60° in the peripheral visual field

2016 ◽  
Vol 16 (12) ◽  
pp. 1179
Author(s):  
Kyriaki Mikellidou ◽  
Francesca Frijia ◽  
Domenico Montanaro ◽  
Vincenzo Greco ◽  
David Burr ◽  
...  
Keyword(s):  
Visual Field ◽  
High Speed ◽  
Peripheral Visual Field ◽  
Cortical Responses

scholarly journals Optic-flow and egocentric-direction strategies in walking: Central vs peripheral visual field

2005 ◽  
Vol 45 (25-26) ◽  
pp. 3117-3132 ◽  
Author(s):  
Kathleen A. Turano ◽  
Dylan Yu ◽  
Lei Hao ◽  
John C. Hicks
Keyword(s):  
Visual Field ◽  
Optic Flow ◽  
Peripheral Visual Field ◽  
Egocentric Direction
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