Prof Paul Hibbard

Kingdom, FAA., Read, JCA., Hibbard, PB. and May, KA., (2022). Special issue: Coding strategies in binocular vision and stereopsis. Vision Research. 193, 107989-107989

Webb, A., Hibbard, P. and Asher, J., (2022). Saccadic eye movements are deployed faster for salient facial stimuli, but are relatively indifferent to their emotional content. Vision Research. 198, 108054-108054

Chiappini, E., Sel, A., Hibbard, P., Avenanti, A. and Romei, V., (2022). Increasing interhemispheric connectivity between human visual motion areas uncovers asymmetric sensitivity to horizontal motion. Current Biology. 32 (18), 4064-4070.e3

Hibbard, P. and Asher, J., (2022). Robust natural depth for anticorrelated random dot stereogram for edge stimuli, but minimal reversed depth for embedded circular stimuli, irrespective of eccentricity. PLoS One. 17 (9), e0274566-e0274566

Asher, JM. and Hibbard, PB., (2022). Visual Field Loss: Integrating Overlayed Information to Increase the Effective Field of View. Vision. 6 (4), 67-67

Hibbard, P., Hornsey, R. and Asher, J., (2022). Binocular Information Improves the Reliability and Consistency of Pictorial Relief. Vision. 7 (1), 1-1

Hornsey, R. and Hibbard, P., (2021). Contributions of Pictorial and Binocular Cues to the Perception of Distance in Virtual Reality. Virtual Reality. 25 (4), 1087-1103

O’Hare, L., Asher, JM. and Hibbard, PB., (2021). Migraine Visual Aura and Cortical Spreading Depression—Linking Mathematical Models to Empirical Evidence. Vision. 5 (2), 30-30

Asher, J., O'Hare, L. and Hibbard, P., (2021). No Evidence of Reduced Contrast Sensitivity in Migraine-with-Aura for Large, Narrowband, Centrally Presented Noise-Masked Stimuli. Vision. 5 (2), 32-32

Goutcher, R., Barrington, C., Hibbard, P. and Graham, B., (2021). Binocular Vision Supports the Development of Scene Segmentation Capabilities: Evidence from a Deep Learning Model. Journal of Vision. 21 (7), 13-13

Kingdom, FAA., Yared, K-C., Hibbard, PB. and May, KA., (2020). Stereoscopic depth adaptation from binocularly correlated versus anti-correlated noise: Test of an efficient coding theory of stereopsis. Vision Research. 166, 60-71

Hibbard, P., Hornsey, R. and Scarfe, P., (2020). Size and Shape Constancy in Consumer Virtual Reality. Behavior Research Methods. 52 (4), 1587-1598

Goutcher, R. and Hibbard, PB., (2020). Impairment of cyclopean surface processing by disparity-defined masking stimuli.. Journal of Vision. 20 (2), 1-18

Webb, ALM., Hibbard, PB. and O'Gorman, R., (2020). Contrast normalisation masks natural expression-related differences and artificially enhances the perceived salience of fear expressions. PLoS One. 15 (6), e0234513-e0234513

Asher, JM. and Hibbard, PB., (2020). No effect of feedback, level of processing or stimulus presentation protocol on perceptual learning when easy and difficult trials are interleaved. Vision Research. 176, 100-117

Webb, ALM. and Hibbard, PB., (2020). Suppression durations for facial expressions under breaking continuous flash suppression: effects of faces’ low-level image properties. Scientific Reports. 10 (1), 17427-

Asher, J., Romei, V. and Hibbard, P., (2019). Spatial Frequency Tuning and Transfer of Perceptual Learning for Motion Coherence Reflects the Tuning Properties of Global Motion Processing. Vision. 3 (3), 44-44

Webb, ALM. and Hibbard, PB., (2019). The effect of facial expression on contrast sensitivity: A behavioural investigation and extension of Hedger, Adams & Garner (2015). PLoS One. 14 (11), e0205621-e0205621

Aldrich, A., Hibbard, P. and Wilkins, A., (2019). Vision and Hyper-Responsiveness in Migraine. Vision. 3 (4), 62-62

Hunter, DW. and Hibbard, PB., (2018). The effect of image position on the Independent Components of natural binocular images. Scientific Reports. 8 (1), 449-

Webb, ALM., Hibbard, PB. and O'Gorman, R., (2018). Natural variation in female reproductive hormones does not affect contrast sensitivity.. Royal Society Open Science. 5 (2), 171566-171566

Chiappini, E., Silvanto, J., Hibbard, PB., Avenanti, A. and Romei, V., (2018). Strengthening functionally specific neural pathways with transcranial brain stimulation. Current Biology. 28 (13), R735-R736

Asher, J., O’Hare, L., Romei, V. and Hibbard, P., (2018). Typical Lateral Interactions, but Increased Contrast Sensitivity, in Migraine-With-Aura. Vision. 2 (1), 7-7

Asher, JM. and Hibbard, PB., (2018). First- and second-order contributions to depth perception in anti-correlated random dot stereograms.. Scientific Reports. 8 (1), 14120-

Goutcher, R., Connolly, E. and Hibbard, PB., (2018). Surface continuity and discontinuity bias the perception of stereoscopic depth. Journal of Vision. 18(12) (13), 1-15

Beattie, L., Curran, W., Benton, CP., Harris, JM. and Hibbard, PB., (2017). Perceived duration of brief visual events is mediated by timing mechanisms at the global stages of visual processing. Royal Society Open Science. 4 (3), 160928-160928

Hibbard, PB., Haines, AE. and Hornsey, RL., (2017). Magnitude, precision, and realism of depth perception in stereoscopic vision. Cognitive Research: Principles and Implications. 2 (25), 25-

Jonas, C., Spiller, MJ., Hibbard, PB. and Proulx, M., (2017). Introduction to the special issue on individual differences in multisensory perception: An overview. Multisensory Research. 30 (6), 461-466

Jonas, C., Spiller, MJ. and Hibbard, P., (2017). Summation of visual attributes in auditory–visual crossmodal correspondences. Psychonomic Bulletin and Review. 24 (4), 1104-1112

Hunter, DW. and Hibbard, PB., (2017). The threshold of binocularity: natural image statistics explain the reduction of visual acuity in peripheral vision

Hunter, DW. and Hibbard, PB., (2016). Ideal Binocular Disparity Detectors Learned Using Independent Subspace Analysis on Binocular Natural Image Pairs. PloS One. 11 (3), e0150117-e0150117

Romei, V., Chiappini, E., Hibbard, PB. and Avenanti, A., (2016). Empowering Reentrant Projections from V5 to V1 Boosts Sensitivity to Motion. Current Biology. 26 (16), 2155-2160

Hornsey, RL., Hibbard, PB. and Scarfe, P., (2016). Binocular depth judgments on smoothly curved surfaces. PLoS ONE. 11 (11), e0165932-e0165932

O'Hare, L. and Hibbard, PB., (2016). Visual processing in migraine. Cephalalgia. 36 (11), 1057-1076

Hibbard, PB., Goutcher, R. and Hunter, DW., (2016). Encoding and estimation of first- and second-order binocular disparity in natural images. Vision Research. 120, 108-120

Curran, W., Benton, CP., Harris, JM., Hibbard, PB. and Beattie, L., (2016). Adapting to time: Duration channels do not mediate human time perception. Journal of Vision. 16 (5), 4-4

Curran, W., Benton, CP., Harris, JM., Hibbard, PB. and Beattie, L., (2016). Adapting to time: Duration channels do not mediate human time perception. Journal of Vision. 16 (5), creators-Hibbard=3APaul_B=3A=3A

Jonas, CN. and Hibbard, PB., (2015). Migraine in Synesthetes and Nonsynesthetes: A Prevalence Study. Perception. 44 (10), 1179-1202

Hibbard, PB. and O'Hare, L., (2015). Uncomfortable images produce non-sparse responses in a model of primary visual cortex. Royal Society Open Science. 2 (2), 140535-140535

Zhang, T., O’hare, L., Hibbard, PB., Nefs, HT. and Heynderickx, I., (2015). Depth of Field Affects Perceived Depth in Stereographs. ACM Transactions on Applied Perception. 11 (4), 1-18

Hunter, DW. and Hibbard, PB., (2015). Distribution of independent components of binocular natural images. Journal of Vision. 15 (13), 6-6

Hunter, DW. and Hibbard, PB., (2015). Distribution of independent components of binocular natural images. Journal of Vision. 15 (6)

Goutcher, R. and Hibbard, PB., (2014). Mechanisms for similarity matching in disparity measurement. Frontiers in Psychology. 4 (JAN), 1014-

Hibbard, PB., Scott-Brown, KC., Haigh, EC. and Adrain, M., (2014). Depth Perception Not Found in Human Observers for Static or Dynamic Anti-Correlated Random Dot Stereograms. PLoS ONE. 9 (1), e84087-e84087

Hunter, D. and Hibbard, P., (2014). Effect of eccentricity on disparity distributions in binocular natural images. Journal of Vision. 14 (10), 973-973

Hibbard, PB., Scott-Brown, KC., Haigh, EC. and Adrain, M., (2014). Depth Perception Not Found in Human Observers for Static or Dynamic Anti-Correlated Random Dot Stereograms. PloS One. 9 (1), creators-Hibbard=3APaul_B=3A=3A

Scarfe, P. and Hibbard, PB., (2013). Reverse correlation reveals how observers sample visual information when estimating three-dimensional shape. Vision Research. 86, 115-127

O'Hare, L., Zhang, T., Nefs, HT. and Hibbard, PB., (2013). Visual Discomfort and Depth-of-Field. i-Perception. 4 (3), 156-169

O'Hare, L., Clarke, ADF. and Hibbard, PB., (2013). Visual Search and Visual Discomfort. Perception. 42 (1), 1-15

O'Hare, L. and Hibbard, PB., (2013). Visual discomfort and blur. Journal of Vision. 13 (5), 7-7

Vishwanath, D. and Hibbard, PB., (2013). Seeing in 3-D With Just One Eye. Psychological Science. 24 (9), 1673-1685

Hibbard, PB., (2013). Review: Sensory Cue Integration. Perception. 42 (4), 477-479

Harris, JM., Chopin, A., Zeiner, K. and Hibbard, PB., (2012). Perception of Relative Depth Interval: Systematic Biases in Perceived Depth. Quarterly Journal of Experimental Psychology. 65 (1), 73-91

Bannerman, RL., Hibbard, PB., Chalmers, K. and Sahraie, A., (2012). Saccadic latency is modulated by emotional content of spatially filtered face stimuli.. Emotion. 12 (6), 1384-1392

May, KA., Zhaoping, L. and Hibbard, PB., (2012). Perceived Direction of Motion Determined by Adaptation to Static Binocular Images. Current Biology. 22 (1), 28-32

Hibbard, PB., Goutcher, R., O’Kane, LM. and Scarfe, P., (2012). Misperception of aspect ratio in binocularly viewed surfaces. Vision Research. 70, 34-43

O’Hare, L. and Hibbard, PB., (2011). Spatial frequency and visual discomfort. Vision Research. 51 (15), 1767-1777

Martinovic, J., Mordal, J. and Wuerger, SM., (2011). Event-related potentials reveal an early advantage for luminance contours in the processing of objects. Journal of Vision. 11 (7), 1-1

Keefe, BD., Hibbard, PB. and Watt, SJ., (2011). Depth-cue integration in grasp programming: No evidence for a binocular specialism. Neuropsychologia. 49 (5), 1246-1257

Martinovic, J., Mordal, J. and Wuerger, SM., (2011). Event-related potentials reveal an early advantage for luminance contours in the processing of objects.. Journal of vision. 11 (7), 1-

Scarfe, P. and Hibbard, PB., (2011). Statistically optimal integration of biased sensory estimates. Journal of Vision. 11 (7), 12-12

Scarfe, P. and Johnston, A., (2011). Global motion coherence can influence the representation of ambiguous local motion. Journal of Vision. 11 (12), 6-6

O’Kane, LM. and Hibbard, PB., (2010). Contextual effects on perceived three-dimensional shape. Vision Research. 50 (11), 1095-1100

Mon-Williams, M., Murphy, S. and Hibbard, P., (2010). The tactics and timing of smooth corrections in human arm movements. Journal of Vision. 3 (9), 388-388

Sahraie, A., Hibbard, PB., Trevethan, CT., Ritchie, KL. and Weiskrantz, L., (2010). Consciousness of the first order in blindsight. Proceedings of the National Academy of Sciences. 107 (49), 21217-21222

Goutcher, R. and Hibbard, PB., (2010). Evidence for relative disparity matching in the perception of an ambiguous stereogram. Journal of Vision. 10 (12), 35-35

Hibbard, PB., (2010). Integration and segmentation of opposite contrast polarities in the perception of motion. Journal of Vision. 2 (7), 396-396

Goutcher, R. and Hibbard, PB., (2010). Evidence for relative disparity matching in the perception of an ambiguous stereogram. Journal of Vision. 10 (12), 35-35

Hibbard, PB., (2008). Binocular energy responses to natural images. Vision Research. 48 (12), 1427-1439

Hibbard, P., (2008). Can appearance be so deceptive? Representationalism and binocular vision. Spatial Vision. 21 (6), 549-559

Hibbard, PB., (2008). Binocular energy responses to natural images. VISION RESEARCH. 48 (12), 1427-1439

Curran, W., Hibbard, PB. and Johnston, A., (2007). The visual processing of motion-defined transparency. Proceedings of the Royal Society B: Biological Sciences. 274 (1613), 1049-1057

O'Kane, LM. and Hibbard, PB., (2007). Vertical Disparity Affects Shape and Size Judgments across Surfaces Separated in Depth. Perception. 36 (5), 696-702

Hibbard, PB., (2007). A statistical model of binocular disparity. Visual Cognition. 15 (2), 149-165

Bradshaw, MF., Hibbard, PB., Parton, AD., Rose, D. and Langley, K., (2006). Surface orientation, modulation frequency and the detection and perception of depth defined by binocular disparity and motion parallax. Vision Research. 46 (17), 2636-2644

Hibbard, PB. and Bradshaw, MF., (2006). 2-D Tilt and 3-D Slant Illusions in Perception and Action Tasks. Perception. 35 (10), 1297-1305

Scarfe, P. and Hibbard, PB., (2006). Disparity-defined objects moving in depth do not elicit three-dimensional shape constancy. Vision Research. 46 (10), 1599-1610

Hibbard, PB., (2005). The orientation bandwidth of cyclopean channels. Vision Research. 45 (21), 2780-2785

Bouzit, S. and Hibbard, P., (2005). Stereoscopic correspondence for ambiguous targets is affected by elevation and fixation distance. Spatial Vision. 18 (4), 399-411

Watt, S., Elliott, K., Bradshaw, M., Simpson, PJ., Davies, I. and Hibbard, P., (2004). Binocular cues and the control of prehension. Spatial Vision. 17 (1-2), 95-110

Bradshaw, MF., Elliott, KM., Watt, SJ., Hibbard, PB., Davies, IRL. and Simpson, PJ., (2004). Binocular cues and the control of prehension. Spatial vision. 17 (1-2), 95-110

Hibbard, PB. and Bradshaw, MF., (2003). Reaching for virtual objects: binocular disparity and the control of prehension. Experimental Brain Research. 148 (2), 196-201

Rose, D., Bradshaw, MF. and Hibbard, PB., (2003). Attention Affects the Stereoscopic Depth Aftereffect. Perception. 32 (5), 635-640

Bradshaw, MF. and Hibbard, PB., (2003). Reaching for virtual objects: binocular disparity, retinal motion and the control of prehension. Arquivos Brasileiros de Oftalmologia. 66 (5), 53-61

Bradshaw, M. and Hibbard, P., (2002). Isotropic integration of binocular disparity and relative motion in the perception of three-dimensional shape. Spatial Vision. 15 (2), 205-217

Hibbard, P., Simpson, PJ. and Bradshaw, M., (2002). The stereoscopic anisotropy affects manual pointing. Spatial Vision. 15 (4), 443-458

Bradshaw, MF., Hibbard, PB. and Gillam, B., (2002). Perceptual latencies to discriminate surface orientation in stereopsis. Perception & Psychophysics. 64 (1), 32-40

Hibbard, PB., Bradshaw, MF., Langley, K. and Rogers, BJ., (2002). The stereoscopic anisotropy: Individual differences and underlying mechanisms.. Journal of Experimental Psychology: Human Perception and Performance. 28 (2), 469-476

Hibbard, PB., Bradshaw, MF., Langley, K. and Rogers, BJ., (2002). The stereoscopic ansiotropy: Individual differences and underlying mechanisms.. Journal of Experimental Psychology: Human Perception and Performance. 28 (2), 469-476

Hibbard, PB., Bradshaw, MF. and Eagle, RA., (2000). Cue combination in the motion correspondence problem. Proceedings of the Royal Society of London. Series B: Biological Sciences. 267 (1450), 1369-1374

Langley, K., Fleet, DJ. and Hibbard, PB., (1999). Stereopsis from contrast envelopes. Vision Research. 39 (14), 2313-2324

Hibbard, PB., Bradshaw, MF. and DeBruyn, B., (1999). Global motion processing is not tuned for binocular disparity. Vision Research. 39 (5), 961-974

Everatt, J., Bradshaw, MF. and Hibbard, PB., (1999). Visual Processing and Dyslexia. Perception. 28 (2), 243-254

Hibbard, PB. and Bradshaw, MF., (1999). Does Binocular Disparity Facilitate the Detection of Transparent Motion?. Perception. 28 (2), 183-191

Hibbard, PB. and Langley, K., (1998). Plaid slant and inclination thresholds can be predicted from components. Vision Research. 38 (8), 1073-1084

Langley, K., Fleet, DJ. and Hibbard, PB., (1998). Linear and nonlinear transparencies in binocular vision. Proceedings of the Royal Society of London. Series B: Biological Sciences. 265 (1408), 1837-1845

Bradshaw, MF. and Hibbard, PB., (1998). Depth Perception. Perception. 27 (11), 1263-1265

Langley, K., Fleet, DJ. and Hibbard, PB., (1996). Linear filtering precedes nonlinear processing in early vision. Current Biology. 6 (7), 891-896

Asher, JM., Vigh, G. and Hibbard, PB., (2021). Augmenting reality for visual field loss: integrating overlayed information to increase the field of view, a pilot study

Stephens, JR., Hibbard, PB. and van Dam, LCJ., (2021). Computer cursor orientation affects both pointing behaviour and the sense of agency in a target pointing task

Van Dam, LCJ., Webb, ALM., Jarvis, L., Linley, M. and Hibbard, PB., (2020). "The Mystery of the Raddlesham Mumps": A case study for combined storytelling in a theatre play and Virtual Reality

Hibbard, P., Van Dam, L. and Scarfe, P., (2020). The Implications of Interpupillary Distance Variability for Virtual Reality

Hibbard, P., Webb, A., Linley, M. and Van Dam, L., (2019). Combining Virtual Reality and Traditional Story Telling in “The Mystery of the Raddlesham Mumps”: A case study.

Asher, J. and Hibbard, P., (2019). The effect of feedback and stimulus presentation protocol on perceptual learning for local and global motion and form

Hughes, R., Scarfe, P., Hibbard, P. and Van Dam, L., (2018). Perception of Object Movement in Virtual Reality

Webb, ALM., Hibbard, PB. and O'Gorman, R., (2017). The Effect of Emotional Expression on the Luminance Contrast of Faces

Asher, JM., O'Hare, L., Romei, V. and Hibbard, PB., (2017). Normal Lateral Interactions, but Increased Contrast Sensitivity, in Migraine With Aura

Hibbard, PB., Hornsey, RL. and Khan, NZ., (2017). The Contribution of Binocular and Motion Cues to Depth Quality in Complex Naturalistic Scenes

Asher, J., Romei, V. and Hibbard, P., (2017). External Reinforcement Is Needed for Perceptual Learning of Global Motion

Hunter, DW. and Hibbard, PB., (2016). When does an encoding become a percept?

Asher, JM., Romei, V. and Hibbard, PB., (2016). Perceptual learning for global motion is tuned for spatial frequency

Hibbard, PB. and Goutcher, R., (2016). The Extraction of Disparity- Defined Structure Using Cyclopean Filtering

Webb, AL. and Hibbard, PB., (2016). The threat bias for fearful expressions is evident in apparent contrast

Hibbard, PB., Scarfe, P., Goutcher, R. and Hunter, DW., (2015). Optimal encoding of binocular images by cortical neurons

Hornsey, RL., Hibbard, PB. and Scarfe, P., (2015). Ordinal judgments of depth in monocularly- and stereoscopically-viewed photographs of complex natural scenes

Hornsey, RL. and Hibbard, PB., (2015). Evaluation of the accuracy of the Leap Motion controller for measurements of grip aperture

Haines, AE., Hornsey, RL. and Hibbard, PB., (2015). Quality, quantity and precision of depth perception in stereoscopic displays

Hunter, DW., Goutcher, R. and Hibbard, PB., (2015). Towards a biologically plausible model of binocular disparity encoding

Webb, A., Hibbard, P. and O'Gorman, R., (2015). Variation in female reproductive hormones does not affect contrast sensitivity

Wilkins, AJ. and Hibbard, PB., (2014). Discomfort and hypermetabolism

O'Hare, L., Clarke, A. and Hibbard, PB., (2013). Modelling Responses to Uncomfortable Images

Clarke, A., O'Hare, L. and Hibbard, PB., (2013). Rating Riloids: the effect of curvature and luminance frequency on visual discomfort

Hibbard, PB. and Scott-Brown, KC., (2013). Surface slant can be perceived from orientation disparities

Goutcher, R., Hunter, DW. and Hibbard, PB., (2013). Tuned Inhibitory Responses in Binocular Natural Images

Hunter, DW. and Hibbard, PB., (2013). Statistics of Natural Binocular Images

O'Hare, L. and Hibbard, PB., (2012). A Wider Look at Visual Discomfort

Curran, W., Benton, CP., Hibbard, PB. and Harris, JM., (2012). Testing the channel-based model of duration perception

O'Hare, L. and Hibbard, PB., (2011). Visual discomfort and blur

Goutcher, R. and Hibbard, PB., (2011). What does a decorrelated stereogram look like?

O'Hare, L. and Hibbard, PB., (2011). Visual discomfort and blur

Hibbard, PB., Scott-Brown, K., Haigh, E. and Adrain, M., (2011). No evidence for the perception of depth in anticorrelated random dot stereograms in a large number of observers

Sahraie, A., Trevethan, CT., Ritchie, KL., Macleod, M-J., Hibbard, PB. and Weiskrantz, L., (2011). Awareness of visual targets within the field defect of hemianopic patients

O'Hare, L. and Hibbard, PB., (2010). Visual discomfort and spatial frequency

May, KA., Zhaoping, L. and Hibbard, PB., (2010). Binocular integration in human vision adapts to maximize information coding efficiency

Scarfe, P. and Hibbard, PB., (2006). Viewing an object from above: The role of height in the visual field and object contour in the perception of 3-D shape

Goutcher, R. and Hibbard, PB., (2006). Perception of multi-stable stereograms

Hibbard, PB., Scarfe, P. and Watt, SJ., (2006). Integration of information across the visual scene in the control of prehension

Scarfe, P. and Hibbard, PB., (2005). Perceptual distortions of three-dimensional shape are consistent between stationary and moving objects

Hibbard, PB. and Harris, JM., (2005). Spatial variation in the statistics of binocular disparity

Hibbard, PB., (2004). Redundancy in natural binocular images

Scarfe, P. and Hibbard, PB., (2004). Noise in horizontal-disparity and vergence signals predicts systematic distortions in the estimation of shape

Rose, D., Bradshaw, MF. and Hibbard, PB., (2004). Do depth aftereffects arise pre-attentively?

Hibbard, PB., (2003). Orientation bandwidths of cyclopean channels measured with the use of notched noise

Hibbard, PB., (2002). The independent components of binocular images

O'Kane, LM. and Hibbard, PB., (2002). Vertical-disparity pooling across spatially segregated surfaces

Watt, SJ., Bradshaw, MF., Hibbard, PB., Davies, IRL., Stringer, NS. and Willis, AR., (2001). <title>Can observers exploit enhanced motion parallax to control reaching movements within telepresence environments?</title>

Willis, AR., Bradshaw, MF., Hibbard, PB., Stringer, NS., Davies, IRL. and Watt, SJ., (2001). <title>Can telepresent observers learn to take account of enhanced binocular disparities?</title>

Bradshaw, MF., Hibbard, PB., van der Willigen, R., Watt, SJ., Davies, IRL., Stringer, NS., Beagley, N. and Willis, AR., (2000). Can observers exploit enhanced-disparity information to control reaching movements within telepresence environments?

Frisby, JP., Catherall, C., Porrill, J. and Buckley, D., (1997). Sequential Stereopsis Demonstrated with High-Bandpass Spatial-Frequency Filtered Textures

Lankheet, MJM. and Palmen, M., (1996). Stereoscopic Transparency and Segregation in Depth