Lexical priming from partial-word previews.

Two naming and 2 lexical decision experiments examined the use of partial-word previews in visual word recognition. Replicating results of an earlier reading study, the results of Exps 1 and 2 revealed significant benefits from position-specific beginning- and ending-letter previews. Furthermore, benefits from beginning letters were greater for words than for pseudowords. Ending-letter previews showed no corresponding lexical superiority. Exp 3 revealed that preview of position-specific letters from the beginning plus the ending part of target stimuli, which did not reveal a unique word-beginning letter sequence, facilitated the classification of words but not pseudowords. The results support a 2-route model of lexical access in which some partial-word previews afford activation of specific lexical representations, and some partial-word previews afford activation of subword representations. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Transsaccadic perception of saccade target and flanker objects.

To account for location-dependent and location-independent preview benefits in transsaccadic object perception, J. M. Henderson (1994) and J. M. Henderson and M. D. Anes (1994) proposed a dual-route model in which both episodic object representations and long-term memory representations store information across a saccade. Four experiments are reported in which the dual-route model was assessed. Preview benefits for saccade target objects were found to be location independent, whereas preview benefits for flanker objects were location dependent. These results support a single-route, 2-stage model of transsaccadic object perception. First, preattentive object files are set up to parse a set of attentional and/or saccade targets from peripheral vision, causing location-dependent preview benefits. Second, 1 object is attentionally selected for further processing, activating long-term memory representations and resulting in location-independent preview benefits. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of semantic priming on visual encoding of pictures.

We investigated the effects of semantic priming on initial encoding of briefly presented pictures of objects and scenes. Pictures in 4 experiments were presented for varying durations and were followed immediately by a mask. In Exps 1 and 2, pictures of simple objects were either preceded or not preceded by the object's category name (e.g., dog). In Exp 1 we measured immediate object identification; in Exp 2 we measured delayed old/new recognition in which targets and distractors were from the same categories. In Exp 3 naturalistic scenes were either preceded or not preceded by the scene's category name (e.g., supermarket). We measured delayed recognition in which targets and distractors were described by the same category names. In Exps 1–3, performance was better for primed than for unprimed pictures. Exp 4 was similar to Exp 2 in that we measured delayed recognition for simple objects. As in Exps 1–3, a prime that preceded the object improved subsequent memory performance for the object. However, a prime that followed the object did not affect subsequent performance. Together, these results imply that priming leads to more efficient information acquisition. We offer a picture-processing model that accounts for these results. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Role of Saccade Targeting in the Transsaccadic Integration of Object Types and Tokens.

The presence of location-dependent and location-independent benefits on object identification in an eye movement contingent preview paradigm has been taken as support for the transsaccadic integration of object types and object tokens (J. M. Henderson, 1994). A recent study, however, suggests a critical role for saccade targeting in the generation of the 2 preview effects (F. Germeys, De Gr?f, & Verfaillie, 2002). In the present study, eye movements were monitored in a preview paradigm, and both location-independent and location-dependent preview benefits were observed regardless of the saccade target status of the preview object. The findings support the view that type and token representational systems contribute independently to the integration of object information across eye movements. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The influence of enantiomorphic transformation on transsaccadic object integration.

Two experiments investigated whether the left–right orientation of an object is retained and integrated across a saccade during object identification. In Experiment 1, participants moved their eyes to the target object and named it as quickly as possible. In Experiment 2, participants looked through an array of 4 target objects in preparation for an immediate recognition test. In both experiments, a peripheral preview of the target object was presented before fixation. The preview stimulus was identical to the target object, the enantiomorph of the target object, or a control stimulus. Naming latencies were faster (Experiment 1) and gaze durations were shorter (Experiment 2) when the preview was identical to the target than when it was an enantiomorph of the target, suggesting that left–right orientation was retained and integrated across saccades. The results constrain models of transsaccadic integration and object identification. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Presaccadic attention allocation and express saccades

Express saccades are visually-guided saccades that are characterized by an extremely short latency of about 100 ms. The present experiments tested the hypothesis that a disengagement of visual attention is necessary for the generation of express saccades. All subjects produced large numbers of express saccades in the gap paradigm, in which the fixation stimulus is removed 200 ms before target onset (Exp. 1), but not in the overlap paradigm, in which the fixation stimulus remained on during the entire trial (Exp. 2). By means of peripheral cues (Exps. 3-5) and central cues (Exps. 6-7), visual attention was directed at the target location for the saccade before the actual appearance of the saccade target. In all experiments, the location cues facilitated rather than abolished express saccades. The generation of express saccades was facilitated even when the currently fixated visual stimulus was not removed before target onset (fixation-overlap; Exps. 5-7). The results are explained by the hypothesis that a disengagement of a separate fixation system is necessary for the generation of express saccades, a hypothesis that is in line with current neurobiological findings.     

Evidence for the use of phonological representations during transsaccadic word recognition.

The authors explored the role of phonological representations in the integration of lexical information across saccadic eye movements. Study participants executed a saccade to a preview letter string that was presented extrafoveally. In Experiment 1, the preview string was replaced by a target string during the saccade, and the participants performed a lexical decision. Targets with phonologically regular initial trigrams benefited more from a preview than did targets with irregular initial trigrams. In Experiment 2, words with regularly pronounced initial trigrams were more likely to be correctly identified from the preview alone. In Experiment 3, participants were more likely to detect a change across a saccade from regular to irregular initial trigrams than from irregular to regular trigrams. The results suggest that phonological representations are activated from an extrafoveal preview and that this phonological information can be integrated with foveal information following a saccade. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Presenting words without interior letters: Superiority over single letters and influence of postmask boundaries.

In 5 experiments with a total of 32 Ss, exterior letter pairs from 4-letter words (e.g., d??k from dark) were presented in pattern-postmasked displays, in the positions they would occupy if the whole word were shown. In Exp 1, letter pairs (d??k) were reported more accurately than single letters (d) (the pair–letter effect). In Exps 2 and 3, performances with letter pairs dropped to those for single letters when each letter in a pair was masked individually or when masks were much wider than letter pairs. In Exps 4 and 5, the pair–letter effect and mask influence were both removed when one letter in each pair was replaced by a number sign (d??#) or when letter pairs were not the exterior letters of real words (e.g., y??f). These findings suggest that the exterior letter combinations of words are represented psychologically and access to these representations is affected by mask configuration. Implications for current word-recognition models are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Identification of objects in scenes: The role of scene background in object naming.

Research with brief presentations of scenes had indicated that scene context facilitates object identification. In the present experiments a paradigm was used in which an object in a scene is "wiggled," drawing both attention and an eye fixation to itself, and then named. Thus, the effect of scene context on object identification can be examined in a situation in which the target object is fixated and hence is fully visible. Exp 1 indicated that a scene background that was episodically consistent with a target object facilitated the speed of naming. In Exps 2 and 3, the time course of scene background information acquisition was investigated using display changes contingent on eye movements to the target object. The results from Exp 2 were inconclusive; however, Exp 3 demonstrated that scene background information present only on either the 1st or 2nd fixation on a scene significantly affected naming time. Thus, background information appears to be both extracted and able to affect object identification continuously during scene viewing. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Parafoveal processing of words and saccade computation during eye fixations in reading.

Studied parafoveal word processing during eye fixations in reading to answer two questions: (a) Is the processing of parafoveally available words limited to the identification of beginning letters? (b) Does the parafoveal processing of words affect the following interword saccade? Reading afforded either no parafoveal preview, preview of beginning trigrams, preview of ending trigrams, or preview of the whole parafoveal word. Previews were controlled by replacing original letters either with X's or dissimilar letters. Preview benefits were larger for the whole word previews than for beginning or ending trigram previews. X-masks yielded preview benefits from intact beginning and ending trigrams but dissimilar letter masks yielded benefits from beginning trigrams only. Saccades were larger for whole word previews than for no previews. These results support Logogen-type models of word recognition and a model of saccade computation that posits a time-locked functional relation between the acquisition of parafoveal word information and the positioning of each fixation. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Components of the location probability effect in visual search tasks.

In visual search tasks, targets are detected more rapidly when they appear in locations that commonly contain a target than when they appear in locations that rarely contain a target. Five experiments were conducted to investigate 2 specific properties of this location probability effect. In Exp I spatial location of a stimulus row was varied to determine whether high location probability facilitates target detection in a particular location in visual space or a particular relative position within the row. Both were facilitated to approximately the same extent. In Exp II an inducing target occurred with high probability in 1 of 4 display locations, and a test target occurred with equal probability in all 4 locations. Both targets were found more quickly in the high-probability location than in the other locations, but the advantage associated with targets in the high-probability location was larger for the inducing target than for the test target. In Exps III–V the correspondence between the components observed in Exps I and II was examined. The overall pattern of results was compatible with a model in which the location probability effect is produced partly by an attentional spotlight, which facilitates processing of any stimulus appearing in a particular location in visual space, and partly by a network of position-specific letter detectors, which facilitates detection of a particular letter in a particular relative position within a display. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Stimulus-driven attentional capture: Evidence from equiluminant visual objects.

Previous work has shown that abrupt visual onsets capture attention. Possible mechanisms for this phenomenon include (1) luminance-change detection system and (2) a mechanism that detects the appearance of new perceptual objects. Exps 1 and 2 revealed that attention is captured in visual search by the appearance of a new perceptual object even when the object is equiluminant with its background and thus exhibits no luminance change when it appears. Exp 3 showed that a highly salient luminance increment alone is not sufficient to capture attention. These findings suggest that attentional capture is mediated by a mechanism that detects the appearance of new perceptual objects. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Object orientation information in semantic and episodic memory.

Investigated the contributions of object orientation information in semantic and episodic memories to implicit and explicit memory test performance, in 3 experiments. 456 undergraduates were shown color photos of objects, and their memory was assessed either with an old/new recognition test or with a test that required Ss to identify slowly faded objects. The critical variables were the type of photo and the orientation at which the photos were displayed. Half of the targets were displayed in study condition and the rest in non-study condition (baseline). Results show that in Exp 1, baseline identification was slower for objects displayed upside down rather than upright. Baseline orientation-specific effects were much larger for cardinal than non-cardinal objects in Exps 2 and 3. The extent to which orientation is coded in the semantic and episodic memory representations of different kinds of objects is discussed. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Generalization of visual matching by a bottlenosed dolphin (Tursiops truncatus): Evidence for invariance of cognitive performance with visual and auditory materials.

Generalization of a visual matching-to-sample rule was shown in a bottlenosed dolphin, normally considered an auditory specialist. The visual items used were all real-world objects. Some objects had acoustic names in an artificial acoustic language taught to the dolphin named Phoenix. Other objects were unnamed but familiar to Phoenix, and others were objects entirely new to her experience. In Exps 1 and 2, we demonstrated Phoenix's ability to match these objects, from among 2 alternative comparison objects, at levels of 87% correct responses or better, after O-s delay. In Exp 3, Phoenix's matches of familiar and of new objects were better than 94% correct through to delays of 30 s and were 73% correct after a delay of 80 s. In Exp 4, performance was nearly equivalent for statically displayed and dynamically displayed sample objects. Over the 4 experiments, Phoenix matched 16 of 18 objects successfully on the 1st trial that they appeared as samples. From these and other recent findings, it appears that bottlenosed dolphins are capable of carrying out both visual- and auditory-based complex cognitive tasks approximately equally well, a finding at variance with earlier notions of sensory modality limitations in cognitive performance of animals. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

On the orienting value of attitudes: Attitude accessibility as a determinant of an object's attraction of visual attention.

Tested the hypothesis that objects toward which individuals hold attitudes that are highly accessible from memory (i.e., attitude-evoking objects) are more likely to attract attention when presented in a visual display than objects involving less accessible attitudes. In Exps 1 and 2, Ss were more likely to notice and report such attitude-evoking objects. Exp 3 yielded evidence of incidental attention; Ss noticed attitude-evoking objects even when the task made it beneficial to ignore the objects. Exp 4 demonstrated that inclusion of attitude-evoking objects as distractor items interfered with Ss' performance of a visual search task. Apparently, attitude-evoking stimuli attract attention automatically. Thus, accessible attitudes provide the functional benefit of orienting an individual's visual attention toward objects with potential hedonic consequences. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Auditory priming: Implicit and explicit memory for words and voices.

Five experiments explore priming effects on auditory identification and completion tasks as a function of semantic and nonsemantic encoding tasks and whether speaker's voice is same or different at study and test. Auditory priming was either unaffected by the study task manipulation (Exps 2, 4, and 5) or was less affected than was explicit memory (Exps 1 and 3). Study-to-test changes of speaker's voice had significant effects on priming when white noise masked target items on the identification test (Exps 1 and 2) or the stem-completion test (Exp 5). However, significant voice change effects were observed on priming of completion performance when stems were spoken clearly (Exps 3 and 4). Results are consistent with the idea that a presemantic auditory perceptual representation system plays an important role in the observed priming. Alternative explanations of the presence or absence of voice change effects under different task conditions are considered. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Role of the inertia tensor in haptically perceiving where an object is grasped.

When an object is held and wielded, a time-invariant quantity of the wielding dynamics is the inertia tensor Iij. Examination of Iij as a function of different locations at which a cylindrical object is grasped revealed that the off-diagonal components of Iij, the products of inertia, related most systematically to grip position. In 3 experiments, Ss wielded an occluded rod held at an intermediate point along its length and reproduced, with the other hand, the felt grip position on a visible rod. In Exp 1, the wielded rods were homogeneous; in Exps 2 and 3, weights were added on either side of the grasp, with different manners of grasp contrasted in Exp 3. In all 3 experiments, perceived hand position was predicted by Iij. Discussion is focused on the role of Iij's eigenvalues in perceiving the magnitudes of objects and Iij's eigenvectors in perceiving hand–object relations (e.g., position of grasp). (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Word frequency effects in speech production: Retrieval of syntactic information and of phonological form.

In 7 experiments the authors investigated the locus of word frequency effects in speech production. Exp 1 demonstrated a frequency effect in picture naming that was robust over repetitions. Exps 2, 3, and 7 excluded contributions from object identification and initiation of articulation. Exps 4 and 5 investigated whether the effect arises in accessing the syntactic word (lemma) by using a grammatical gender decision task. Although a frequency effect was found, it dissipated under repeated access to a word's gender. Exp 6 tested whether the robust frequency effect arises in accessing the phonological form (lexeme) by having Ss translate words that produced homophones. Low-frequent homophones behaved like high-frequent controls, inheriting the accessing speed of their high-frequent homophone twins. Because homophones share the lexeme, not the lemma, this suggests a lexeme-level origin of the robust effect. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Role of spatial location in integration of pictorial information across saccades.

Identification of a fixated object in a visual display is facilitated by integrating information from a preview of that object in the periphery with information extracted on the subsequent foveal fixation (A. Pollatsek et al; see record 1985-16415-001). These experiments investigated the extent to which this integration is dependent on the spatial location of the information remaining constant. Two preview objects were presented in the periphery; Ss fixated that region and named a single target object that appeared in the same spatial location in which one of the two preview objects had been presented. Of primary interest was the facilitative effect when a preview object was identical to the target object as a function of whether they were in the same spatial location. Although there was a small effect of switching, there was still a substantial preview benefit even when the location of the identical object switched. There was also a preview benefit in conditions in which there were no eye movements and the preview and target objects were at least 5° apart. The process of object identification may be relatively insensitive to location information. Object information and location information coded fairly independently. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Does implicit memory extend to legal and illegal nonwords?

In 4 experiments, implicit and explicit memory for words and nonwords were compared. In Exps 1–2 memory for words and legal nonwords (e.g., kers) was assessed with an identification (implicit) and a recognition (explicit) memory task: Robust priming was obtained for both words and nonwords, and the priming effects dissociated from explicit memory following a levels-of-processing manipulation (Exp 1) and following a study-test modality shift (Exp 2). In Exp 3, priming for legal and illegal nonwords (e.g., xyks) was observed on an identification task, and the effects dissociated from explicit memory following a levels-of-processing manipulation. Finally, in Exp 4, significant inhibitory priming for legal nonwords was observed when a lexical-decision task was used. Results suggest that implicit memory can extend to legal and illegal nonwords. Implications for theories of implicit memory are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)