Search results for: Adam Reeves

Items from 1 to 20 out of 22 results

article

The dependence of color constancy and brightness constancy on saturation

Adam Reeves

Color Research & Application > 43 > 5 > 630 - 632

Color constancy and brightness constancy are not independent, as often assumed, since increasing sample saturation decreases the demand on color constancy mechanisms and increases the demand on brightness constancy mechanisms made by changes in illuminant color temperature. Re‐analyzed published data illustrates these tendencies for low saturations, but comprehensive measurements will be needed to...

article

A new principle of figure-ground segregation: The accentuation

Baingio Pinna, Adam Reeves, Jan Koenderink, Andrea van Doorn, more

Vision Research > 2018 > 143 > C > 9-25

The problem of perceptual organization was studied by Gestalt psychologists in terms of figure-ground segregation. In this paper we explore a new principle of figure-ground segregation: accentuation. We demonstrate the effectiveness of accentuation relative to other Gestalt principles, and also consider it autonomous as it can agree with or oppose them. We consider three dynamic aspects of the principle,...

article

Short-term visual memory for location in depth: A U-shaped function of time

Adam Reeves, Quan Lei

Attention, Perception, & Psychophysics > 2017 > 79 > 7 > 1917-1932

Short-term visual memory was studied by displaying arrays of four or five numerals, each numeral in its own depth plane, followed after various delays by an arrow cue shown in one of the depth planes. Subjects reported the numeral at the depth cued by the arrow. Accuracy fell with increasing cue delay for the first 500 ms or so, and then recovered almost fully. This dipping pattern contrasts with...

article

Genetic analysis of variation in lifespan using a multiparental advanced intercross Drosophila mapping population

Chad A. Highfill, G. Adam Reeves, Stuart J. Macdonald

BMC Genetics > 2016 > 17 > 1 > 1-13

Background Considerable natural variation for lifespan exists within human and animal populations. Genetically dissecting this variation can elucidate the pathways and genes involved in aging, and help uncover the genetic mechanisms underlying risk for age-related diseases. Studying aging in model systems is attractive due to their relatively short lifespan, and the ability to carry out programmed...

article

On the purposes of color for living beings: toward a theory of color organization

Baingio Pinna, Adam Reeves

Psychological Research > 2015 > 79 > 1 > 64-82

Phylogenetic and paleontological evidence indicates that in the animal kingdom the ability to perceive colors evolved independently several times over the course of millennia. This implies a high evolutionary neural investment and suggests that color vision provides some fundamental biological benefits. What are these benefits? Why are some animals so colorful? What are the adaptive and perceptual...

article

Is visual short-term memory depthful?

Adam Reeves, Quan Lei

Vision Research > 2014 > 96 > Complete > 106-112

Does visual short-term memory (VSTM) depend on depth, as it might be if information was stored in more than one depth layer? Depth is critical in natural viewing and might be expected to affect retention, but whether this is so is currently unknown. Cued partial reports of letter arrays (Sperling, 1960) were measured up to 700ms after display termination. Adding stereoscopic depth hardly affected...

article

Attentional release in the saccadic gap effect

Zhenlan Jin, Adam Reeves

Vision Research > 2009 > 49 > 16 > 2045-2055

Can a release of attention from fixation help explain the saccadic ‘gap effect’, the shortening of saccadic latency (SL) when the fixation spot is extinguished just before saccade target onset? Practiced observers generated SLs and button-presses to one of four 10° eccentric targets in overlap (fixation spot stays on), gap0 (fixation offsets at target onset), and gap200 conditions; in gap200, the...

article

Metzger's Challenge

Adam Reeves

Advances in Cognitive Psychology > 2007 > 3 > 1-2 > 361-361

article

An analysis of visual masking, with a defense of 'Stopped Processing'

Adam Reeves

Advances in Cognitive Psychology > 2007 > 3 > 1-2 > 57-65

The use of a backward mask (a patterned mask which follows the target in time) to 'stop the processing' of the target illustrates an important application of masking - the study of the 'microgenesis' of visual perception, that is, visual processing over about the first one-fifth of a second. This paper provides evidence for stopped processing and some applications of this to object recognition and...

article

METZGER'S CHALLENGE

Adam Reeves

Advances in Cognitive Psychology > 2007 > 3 > 1-2 > 361-361

not available

article

AN ANALYSIS OF VISUAL MASKING, WITH A DEFENSE OF 'STOPPED PROCESSING'

Adam Reeves

Advances in Cognitive Psychology > 2007 > 3 > 1-2 > 57-65

article

The role of attention in binding shape to color

Adam Reeves, Heather Fuller, Elisabeth M. Fine

Vision Research > 2005 > 45 > 27 > 3343-3355

Pictures of easily-identifiable objects with novel colors (e.g. a blue frog) or of forms with arbitrary colors (e.g. a green triangle) were presented briefly at 10.6° eccentricity. Stimuli had strong outlines and vivid fill colors (red, green, yellow, blue, or purple). The same pictures were repeated once in each block of 30 trials for 6, 9, or 12 blocks, and recognition was probed after each block...

article

Transient lumanopia at high intensities

Adam Reeves, Shuang Wu

Vision Research > 2004 > 44 > 27 > 3203-3209

Transient lumanopia is the loss of sensitivity to a flicker burst presented in early dark adaptation. We earlier reported that lumanopia with 18Hz flicker was greatest after turning off 400td adapting fields and progressively disappeared as the adapting field was intensified. We now report that lumanopia can occur with intense adapting fields, but only with faster flickers (e.g. 40Hz, 5000td fields)...

article

The roles of distractor noise and target certainty in search: A signal detection model

Nayantara Santhi, Adam Reeves

Vision Research > 2004 > 44 > 12 > 1235-1256

Observers searched arrays of briefly presented near-isoluminant colored disks for a single disk of known color (feature search) or unknown color (oddity search). Speed and accuracy were converted to a single, model-based measure of performance (Perf), in units of (d^′)² per second of latency. Perf decreased with set size in feature search and increased in oddity. In both types of search, grouping the...

article

Generating visual mental images: Latency and vividness are inversely related

Amedeo D'Angiulli, Adam Reeves

Memory & Cognition > 2002 > 30 > 8 > 1179-1188

In three experiments, participants pressed a reaction time key and rated vividness after reading descriptions of common objects and imagining them as accurately as possible within a visual display subtending 1.2° or 10.8°. Display size had small effects on vividness and on image latency. Latency was much faster (≈2.5 sec) for vivid images than for nonvivid ones (≈7.5 sec), regardless of display size...

article

The use of word-picture verification to study entry-level object recognition: Further support for view-invariant mechanisms

Stefano A. DeCaro, Adam Reeves

Memory & Cognition > 2002 > 30 > 5 > 811-821

There are substantial logical and empirical reasons for rejecting the popular view that plane-misoriented objects are identified after normalization of global orientation. Our subjects determined the entry-level identity of common objects (line drawings)before determining basic orientation (upright vs. rotated)-as they must if they are to begin to know how to restore the image to the canonical upright...

article

Rotating objects to determine orientation, not identity: Evidence from a backward-masking/dual-task procedure

Stefano A. Caro, Adam Reeves

Attention, Perception, & Psychophysics > 2000 > 62 > 7 > 1356-1366

The effects of picture-plane rotations on times taken to name familiar objects (RTs) may reflect a process of mental rotation to stored viewpoint-specific representations: therotate-to-recognize hypothesis. Alternatively, mental rotation might be used after stored object representations are activated by a misoriented stimulus in order to verify a weak or distorted shape percept: thedouble-checking hypothesis...

article

The effect of photon noise on the detection of white flashes

Adam Reeves, Shuang Wu, James Schirillo

Vision Research > 1998 > 38 > 5 > 691-703

Thresholds for detecting brief, white, foveal test flashes drop abruptly within 0.2 sec of the offset of a white adapting field. The magnitude of the abrupt drop is proportional to the square root of field intensity (√I) corrected for bleaching and dark light. Thresholds are then stable out to 1.6 sec for 200 msec tests, or recover only slightly for 20 msec tests. These results exclude some simple...

article

Simulated Cataract does not Reduce the Benefit of RSVP

Elisabeth M. Fine, Eli Peli, Adam Reeves

Vision Research > 1997 > 37 > 18 > 2639-2647

Normally sighted younger and older (mean age 71 years) observers read sentences and random lists of words from a rapid serial visual presentation (RSVP) display and a scroll display using their normal vision and through two levels of cataract simulators. Unlike patients with central field loss (CFL), there was no decrease in the benefit of RSVP with reduced vision due to the cataract simulators....

article

Flicker brightness enhancement and visual nonlinearity

Shuang Wu, Stephen A. Burns, Adam Reeves, Ann E. Elsner

Vision Research > 1996 > 36 > 11 > 1573-1583

The purpose of this study was to investigate the nonlinear mechanism underlying brightness enhancement, in which a flickering stimulus appears brighter than a steady stimulus of equal mean luminance. The flickering and matching stimuli were temporally alternated. Both were cosine windowed to minimize the potential effects of temporal transients. Subjects adjusted the amplitude of the matching stimulus...

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INFONA - science communication portal

Search results for: Adam Reeves

The dependence of color constancy and brightness constancy on saturation

A new principle of figure-ground segregation: The accentuation

Short-term visual memory for location in depth: A U-shaped function of time

Genetic analysis of variation in lifespan using a multiparental advanced intercross Drosophila mapping population

On the purposes of color for living beings: toward a theory of color organization

Is visual short-term memory depthful?

Attentional release in the saccadic gap effect

Metzger's Challenge

An analysis of visual masking, with a defense of 'Stopped Processing'

METZGER'S CHALLENGE

AN ANALYSIS OF VISUAL MASKING, WITH A DEFENSE OF 'STOPPED PROCESSING'

The role of attention in binding shape to color

Transient lumanopia at high intensities

The roles of distractor noise and target certainty in search: A signal detection model

Generating visual mental images: Latency and vividness are inversely related

The use of word-picture verification to study entry-level object recognition: Further support for view-invariant mechanisms

Rotating objects to determine orientation, not identity: Evidence from a backward-masking/dual-task procedure

The effect of photon noise on the detection of white flashes

Simulated Cataract does not Reduce the Benefit of RSVP

Flicker brightness enhancement and visual nonlinearity

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