WorldCat Identities

Snodgrass, Joan Gay

Works: 28 works in 90 publications in 1 language and 946 library holdings
Genres: Conference papers and proceedings  Academic theses 
Roles: Author, Other, Editor
Classifications: BF181, 150.724
Publication Timeline
Most widely held works by Joan Gay Snodgrass
The self across psychology : self-recognition, self-awareness, and the self concept( Book )

16 editions published in 1997 in English and held by 311 WorldCat member libraries worldwide

Human experimental psychology by Joan Gay Snodgrass( Book )

12 editions published in 1985 in English and held by 308 WorldCat member libraries worldwide

The numbers game : statistics for psychology by Joan Gay Snodgrass( Book )

20 editions published between 1977 and 1979 in English and held by 250 WorldCat member libraries worldwide

Foreperiod effects in simple reaction time: anticipation or expectancy? by Joan Gay Snodgrass( Book )

7 editions published in 1969 in English and held by 26 WorldCat member libraries worldwide

Workbook for the numbers game : statistics for psychology by Joan Gay Snodgrass( Book )

5 editions published in 1977 in English and Undetermined and held by 17 WorldCat member libraries worldwide

The effect of foreperiod variability and payoffs upon the simple reaction time distribution by Joan Gay Snodgrass( )

4 editions published in 1966 in English and held by 6 WorldCat member libraries worldwide

Functional magnetic resonance imaging of source versus fact memory by Xia Qi( )

1 edition published in 2000 in English and held by 2 WorldCat member libraries worldwide

In Experiments 1 and 2, two conditions were contrasted: one in which only item memory was required and one in which only source memory was required. Experiments 3 and 4 were factorial designs using the same a visual cue and the same auditory cue respectively. In Experiments 3 and 4, two additional conditions were added. The first required neither item nor source retrieval and the second required both item and source memory retrieval. Statistical parametric mapping was carried out to localize brain activities associated with memory functions. Results showed that the right prefrontal lobe is related to episodic memory retrieval. However, there was increased activation in both left frontal and hippocampal regions for source memory retrieval compared to item memory retrieval. A left-frontal lateralization for source encoding and retrieval was found
Perception and Memory of Pictures( Book )

2 editions published in 1991 in English and held by 2 WorldCat member libraries worldwide

This research is concerned with perception and memory of pictures. The theoretical motivation behind the experiments vary from area to area: in some cases, we want to test predictions of a connectionist model for picture recognition; in others we want to compare pictures with words to determine whether the two surface forms are understood at the same rate; in still others, the pictures are used as a vehicle to study questions about implicit memory. Although there are five areas of research, here I will mention highlights from only two. In the area of perception, interference in identification of a degraded image occurs when even more degraded images of the same object precede it. We tested, and rejected, the explanation proposed by Bruner and Potter that erroneous hypotheses about the object's identity interfere with subsequent recognition in favor of the explanation generated by our connectionist model. This explanation holds that transient activation of perceptual features common to the target and its distractors reduces the signal-to-noise ratio and causes interference. We were able to eliminate interference by having subjects solve math problems between presentations of the more degraded images. In the area of implicit memory, we found that the best priming stimulus for subsequent identification was a moderately fragmented, as compared to a very fragmented or almost complete stimulus. We developed the perceptual closure hypothesis to account for this effect -- it says that the more difficult perceptual closure or completion of the fragmented figure is to achieve, the more priming occurs, as along as closure is finally achieved
Facilitation and Interference in Identification of Pictures and Words( Book )

2 editions published between 1993 and 1994 in English and held by 2 WorldCat member libraries worldwide

This research is concerned with facilitation and interference in the identification of pictures and words. The authors study facilitation by presenting subjects with fragmented stimuli to identify during study, and then test the ability of various types of study stimuli to prime or improve performance on the same stimuli when presented again. An important finding from their previous research is that subjects show more priming when they study a picture that is moderately fragmented during study than one which is either very fragmented or almost intact. They accounted for this phenomenon by the perceptual closure hypothesis, which says that experiencing perceptual closure, or completion of an incomplete figure during a study episode, has the most facilitative effect on subsequent identification. They study interference by presenting more degraded versions of a picture or word just prior to the identification test. Perceptual interference is generally observed if a picture or word is preceded by more fragmented versions of itself just prior to identification. Much of their work on this aspect of the research concerns discovering the reason for the perceptual interference
High-density electrical mapping of perceptual closure processes by Glen Michael Doniger( )

1 edition published in 2001 in English and held by 2 WorldCat member libraries worldwide

The second study examined the impact of perceptual learning on closure-related brain processes. Periodic repetition of a subset of picture sequences was used to induce repetition priming due to perceptual learning. This priming had an electrophysiological signature--enhancement of the occipito-temporal N1 component--that is putatively generated in LO complex, but significantly precedes the electrophysiological correlate of closure. That the earliest priming-related activity occurs over LO complex suggests that the sensory trace itself may reside in these object recognition areas. Schizophrenia patients require significantly more visual information than normal individuals to achieve object recognition from partial information. In the third study, we assessed the neural integrity of perceptual closure processes in schizophrenia patients by the same methodology as the first study. Schizophrenia patients showed profound Ncl-impairment in addition to dramatic reduction in the early parieto-occipital P1 component. In contrast, the intervening occipito-temporal N1 component remained intact. These findings suggest a highly specific pattern of deficits in schizophrenia, in which aberrant dorsal stream gating impacts upon ventral stream processing at a relatively "late" stage in the processing hierarchy
Toward a Model for Picture and Word Processing by Joan Gay Snodgrass( Book )

1 edition published in 1979 in English and held by 2 WorldCat member libraries worldwide

A model was developed to account for similarities and differences between picture and word processing in a variety of semantic and episodic memory tasks. The model contains three levels of processing: low-level processing of the physical characteristics of externally presented pictures and words; an intermediate level where the low-level processor makes contact with prototypical information about the looks of objects or pictures and the sounds of words; and the deepest (propositional) level where meaning is analyzed. The relationships between pictures and their names (or between visual and acoustic images) can take place directly, between the two image stores, or indirectly, via the propositional level to which both image stores have access. One difference between pictures and their names is the greater variability of appearances that objects and pictures have. A second difference is that pictures have less ambiguity of reference than their names, resulting in fewer propositional memory nodes accessed by pictures than by words. These differences are consistent with a large body of literature on picture-word processing differences. (Author/RL)
Theory and experimentation in signal detection. by Joan Gay Snodgrass( Visual )

1 edition published in 1972 in English and held by 2 WorldCat member libraries worldwide

Presents an introduction to signal detection theory, a description of experimental methods and methods of data analysis. Includes a computer program which simulates the behavior of an ideal observer in a Yes-No signal detection experiment, and a sample experiment using SDT methods to analyze recognition memory for high and low imagery words
Translating versus picture naming : similarities and differences by Joan Gay Snodgrass( )

2 editions published in 1993 in Undetermined and English and held by 2 WorldCat member libraries worldwide

Recognition memory vs. source memory : a comparison of their time-course in a speed-accuracy trade-off paradigm by Hikari Kinjo( )

1 edition published in 1998 in English and held by 1 WorldCat member library worldwide

The retrieval speed and strength of recognition memory and source memory were compared and contrasted by using a response-signal speed-accuracy trade-off (SAT) paradigm. There were two goals in this study; to test a popular assumption that recognition memory becomes available before source memory and to demonstrate a potential danger in relying upon typical source monitoring tasks. Unlike a typical source monitoring task in which recognition and source memory are assessed simultaneously, we tested recognition and source memory separately (Experiments 2-4). In the pure source monitoring tasks, participants are required to focus on a single source condition and indicate whether or not each probe has been studied under that condition. There are three major findings in this study. First, the result in Experiment 2 showed no difference in retrieval dynamics between the two types of memory. This indicates that the common assumption proposed above may not always hold
Perceptual identification thresholds for 150 fragmented pictures from the Snodgrass and Vanderwart picture set by Joan Gay Snodgrass( Book )

1 edition published in 1988 in English and held by 1 WorldCat member library worldwide

Human experimental psychology by Joan Gay Snodgrass( Recording )

1 edition published in 1985 in English and held by 1 WorldCat member library worldwide

Effects of subliminally activated merging fantasies on memory by Mona Rea Moss( Book )

1 edition published in 1988 in English and held by 1 WorldCat member library worldwide

This study investigated the influence of subliminally activated merging fantasies on memory of (a) auditory Paragraphs, (b) long-term, semantic Information, (c) a Fairy Tale, Little Red Riding Hood and a Nursery Rhyme, Georgie Porgie; and (d) aspects of Personal Memories. Sixty-three male undergraduate students first evaluated for memory ability were subliminally exposed via tachistoscope to a positive symbiotic message, MOMMY AND I ARE ONE; a negative symbiotic message, I AM LOSING MOMMY; and a control message
Foreperiod effects in simple reaction time: Anticipation or expectancy? by Joan Gay Snodgrass( Book )

1 edition published in 1969 in Undetermined and held by 1 WorldCat member library worldwide

Context effects on item and source memory : evidence for contextual search in recognition memory by Pamela Dalton( Book )

1 edition published in 1993 in English and held by 1 WorldCat member library worldwide

Finally, Experiment 4 made use of the process dissociation paradigm (Jacoby, 1991) to establish two conditions: one in which successful recognition depended on retrieval of the context and one in which recognition could be made on the basis of familiarity alone. The major conclusion is that changing the context impairs subjects' recognition when successful discrimination of face depends upon the retrieval of the context
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Audience level: 0.59 (from 0.46 for Theory and ... to 0.99 for Perception ...)

Human experimental psychology
Human experimental psychology
Alternative Names
Gay Snodgrass Joan

Snodgrass, Joan G.

English (77)