Morton Ann Gernsbacher

Handbook of Psycholinguistics

K. Haberlandt, Methods in Reading Research. F. Ferreira and M. Anes, Why Study Spoken Language? K. Rayner and S.C. Sereno, Eye Movements in Reading Psycholinguistic Studies. M. Kutas and C.K. Van Petten, Psycholinguistics Electrified: Event-Related Brain Potential Investigations. R.E. Remez, A Guide to Research on the Perception of Speech. K.R. Kluender, Speech Perception as a Tractable Problem in Cognitive Science. D.W. Massaro, Psychological Aspects of Speech Perception: Implications for Research and Theory. S.E. Lively, D.B. Pisoni, and S.D. Goldinger, Spoken Word Recognition: Research and Theory. D.A. Balota, Visual Word Recognition: The Journey from Features to Meaning. G.B. Simpson, Context and the Processing of Ambiguous Words. D.C. Mitchell, Sentence Parsing. R.W. Gibbs, Jr., Figurative Thought and Figurative Language. C. Cacciari and S. Glucksberg, Understanding Figurative Language. M. Singer, Discourse Inference Processes. A.C. Graesser, C.L. McMahen, and B.K. Johnson, Question Asking and Answering. P. van den Broek, Comprehension and Memory of Narrative Texts: Inferences and Coherence. C.R. Fletcher, Levels of Representation in Memory for Discourse. A.M. Glenberg, P. Kruley, and W.E. Langston, Analogical Processes in Comprehension: Simulation of a Mental Model. B.K. Britton, Understanding Expository Text: Building Mental Structures to Induce Insights. S.C. Garrod and A.J. Sanford, Resolving Sentences in a Discourse Context: How Discourse Representation Affects Language Understanding. A.J. Sanford and S.C. Garrod, Selective Processing in Text Understanding. W. Kintsch, The Psychology of Discourse Processing. P. Bloom, Recent Controversies in the Study of Language Acquisition. L. Gerken, Child Phonology: Past Research, Present Questions, Future Directions. J. Oakhill, Individual Differences in Childrens Text Comprehension. C.A. Perfetti, Psycholinguistics and Reading Ability. R.K. Olson, Language Deficits in Specific Reading Disability. K. Kilborn, Learning a Language Late: Second Language Acquisition in Adults. K. Bock and W. Levelt, Language Production: Grammatical Encoding. H.H. Clark, Discourse in Production. D. Caplan, Language and the Brain. E. Zurif and D. Swinney, The Neuropsychology of Language. P.A. Carpenter, A. Miyake, and M.A Just, Working Memory Constraints in Comprehension: Evidence from Individual Differences, Aphasia, and Aging. A. Garnham, Future Directions. Index.

Gaze fixation and the neural circuitry of face processing in autism

Diminished gaze fixation is one of the core features of autism and has been proposed to be associated with abnormalities in the neural circuitry of affect. We tested this hypothesis in two separate studies using eye tracking while measuring functional brain activity during facial discrimination tasks in individuals with autism and in typically developing individuals. Activation in the fusiform gyrus and amygdala was strongly and positively correlated with the time spent fixating the eyes in the autistic group in both studies, suggesting that diminished gaze fixation may account for the fusiform hypoactivation to faces commonly reported in autism. In addition, variation in eye fixation within autistic individuals was strongly and positively associated with amygdala activation across both studies, suggesting a heightened emotional response associated with gaze fixation in autism.

The mechanism of suppression: a component of general comprehension skill.

We investigated whether the cognitive mechanism of suppression underlies differences in adult comprehension skill. Less skilled comprehenders reject less efficiently the inappropriate meanings of ambiguous words (e.g., the playing card vs. garden tool meaning of spade), the incorrect forms of homophones (e.g., patients vs. patience), the highly typical but absent members of scenes (e.g., a tractor in a farm scene), and words superimposed on pictures or pictures surrounding words. However, less skilled comprehenders are not less cognizant of what is contextually appropriate; in fact, they benefit from a biasing context just as much (and perhaps more) as more skilled comprehenders do. Thus, less skilled comprehenders do not have difficulty enhancing contextually appropriate information. Instead, we suggest that less skilled comprehenders suffer from a less efficient suppression mechanism, which we conclude is an important component of general comprehension skill.

Investigating differences in general comprehension skill

For adults, skill at comprehending written language correlates highly with skill at comprehending spoken language. Does this general comprehension skill extend beyond language-based modalities? And if it does, what cognitive processes and mechanisms differentiate individuals who are more versus less proficient in general comprehension skill? In our first experiment, we found that skill in comprehending written and auditory stories correlates highly with skill in comprehending nonverbal, picture stories. This finding supports the hypothesis that general comprehension skill extends beyond language. We also found support for the hypotheses that poorer access to recently comprehended information marks less proficient general comprehension skill (Experiment 2) because less skilled comprehenders develop too many mental substructures during comprehension (Experiment 3), perhaps because they inefficiently suppress irrelevant information (Experiment 4). Thus, the cognitive processes and mechanisms involved in capturing and representing the structure of comprehensible information provide one source of individual differences in general comprehension skill.

The Level and Nature of Autistic Intelligence

Autistics are presumed to be characterized by cognitive impairment, and their cognitive strengths (e.g., in Block Design performance) are frequently interpreted as low-level by-products of high-level deficits, not as direct manifestations of intelligence. Recent attempts to identify the neuroanatomical and neurofunctional signature of autism have been positioned on this universal, but untested, assumption. We therefore assessed a broad sample of 38 autistic children on the preeminent test of fluid intelligence, Ravens Progressive Matrices. Their scores were, on average, 30 percentile points, and in some cases more than 70 percentile points, higher than their scores on the Wechsler scales of intelligence. Typically developing control children showed no such discrepancy, and a similar contrast was observed when a sample of autistic adults was compared with a sample of nonautistic adults. We conclude that intelligence has been underestimated in autistics.

Accessing sentence participants: The advantage of First Mention

We investigate the following finding concerning the order in which participants are mentioned in sentences: In a probe recognition task, probe words are responded to considerably more rapidly when they are the names of the first- as opposed to the second-mentioned participants. Seven experiments demonstrated that this advantage is not attributable to the tendency in English for first-mentioned participants to be semantic agents; neither is it due to the fact that in many of our experiments, the first-mentioned participants were also the initial words of their stimulus sentences. Furthermore, the advantage is not attenuated when the first- and second-mentioned participants share syntactic subjecthood, or even when the first-mentioned participants are not the syntactic subjects. In sum, the effect does not appear to be attributable to linguistic factors. We suggest instead that it is the result of cognitive processes: Building a coherent mental representation requires first laying a foundation and then mapping subsequent information onto the developing representation. First-mentioned participants are more accessible because they form the foundations for their sentence. Level representations and because it is through them that subsequent information gets mapped onto the developing representations.

Two decades of structure building

During the past decade I have been developing a very simple framework for describing the cognitive processes and mechanisms involved in discourse comprehension. I call this framework the Structure Building Framework, and it is based on evidence provided during the first decade of discourse processing research. According to the Structure Building Framework, the goal of comprehension is to build coherent mental representations or structures. Comprehenders build each structure by first laying a foundation. Comprehenders develop mental structures by mapping on new information when that information coheres or relates to previous information. However, when the incoming information is less related, comprehenders shift and attach a new substructure. The building blocks of mental structures are memory nodes, which are activated by incoming stimuli and controlled by two cognitive mechanisms: suppression and enhancement. In this article, first I review the seminal work on which the Structure Building Framework is based (the first decade of structure building research); then I recount the research I have conducted to test the Structure Building Framework (the second decade of structure building research).

Functional Neuroanatomy of the Cognitive Process of Mapping During Discourse Comprehension

We used functional magnetic resonance imaging (fMRI) to identify brain regions involved in the process of mapping coherent discourse onto a developing mental representation. We manipulated discourse coherence by presenting sentences with definite articles (which lead to more coherent discourse) or indefinite articles (which lead to less coherent discourse). Comprehending connected discourse, compared with reading unrelated sentences, produced more neural activity in the right than left hemisphere of the frontal lobe. Thus, the right hemisphere of the frontal lobe is involved in some of the processes underlying mapping. In contrast, left-hemisphere structures were associated with lower-level processes in reading (such as word recognition and syntactic processing). Our results demonstrate the utility of using fMRI to investigate the neural substrates of higher-level cognitive processes such as discourse comprehension.

Right and left hemisphere cooperation for drawing predictive and coherence inferences during normal story comprehension.

In three experiments, healthy young participants listened to stories promoting inferences and named inference-related test words presented to the right visual field-Left Hemisphere (rvf-LH) or to the left visual field-Right Hemisphere (lvf-RH). Participants showed priming for predictive inferences only for target words presented to the lvf-RH; in contrast, they showed priming for coherence inferences only for target words presented to the rvf-LH. These results, plus the fact that patients with RH brain damage have difficulty drawing coherence inferences and do not show inference-related priming, suggest that information capable of supporting predictive inferences is more likely to be initially activated in the RH than the LH, but following coherence breaks these concepts (now coherence inferences) are completed in the LH. These results are consistent with the theory that the RH engages in relatively coarse semantic coding, which aids full comprehension of discourse.

Less Skilled Readers Have Less Efficient Suppression Mechanisms

One approach to understanding the component processes and mechanisms underlying adult reading skill is to compare the performance of more skilled and less skilled readers on laboratory experiments. The results of some recent experiments employing this approach demonstrate that less skilled adult readers suppress less efficiently the inappropriate meanings of ambiguous words (e.g., the playing card vs. garden tool meanings of spaded, the incorrect forms of homophones (e.g., patients vs. patience), the typical-but-absent members of scenes (e.g., a tractor in a farm scene), and words superimposed on pictures. Less skilled readers are not less efficient in activating contextually appropriate information; in fact, they activate contextually appropriate information more strongly than more skilled readers do. Therefore, one conclusion that can be drawn from these experiments is that less skilled adult readers suffer from less efficient suppression mechanisms.