German inflection: The exception that proves the rule. Marcus, G. F, Brinkmann, U, Clahsen, H, Wiese, R, & Pinker, S Cognit Psychol, 29(3):189-256, 1995.
abstract   bibtex   
Language is often explained as the product of generative rules and a memorized lexicon. For example, most English verbs take a regular past tense suffix (ask-asked), which is applied to new verbs (faxed, wugged), suggesting the mental rule "add -ed to a Verb." Irregular verbs (break-broke, go-went) would be listed in memory. Alternatively, a pattern associator memory (such as a connectionist network) might record all past tense forms and generalize to new ones by similarity; irregular and regular patterns would differ only because of their different numbers of verbs. We present evidence that mental rules are indispensible. A rule concatenates a suffix to a symbol for verbs, so it does not require access to memorized verbs or their sound patterns, but applies as the "default," whenever memory access fails. We find 21 such circumstances for regular past tense formation, including novel, unusual-sounding, and rootless and headless derived words; in every case, people inflect them regularly (explaining quirks like flied out, sabre-tooths, walkmans). Contrary to the connectionist account, these effects are not due to regular words constituting a large majority of vocabulary. The German participle -t applies to a much smaller percentage of verbs than its English counterpart, and the German plural -s applies to a small minority of nouns. But the affixes behave in the language like their English counterparts, as defaults. We corroborate this effect in two experiments eliciting ratings of participle and plural forms of novel German words. Thus default suffixation is not due to numerous regular words reinforcing a pattern in associative memory. Because default cases do not occupy a cohesive similarity space, but do correspond to the range of a symbol, they are evidence for a memory-independent, symbol-concatenating mental operation.
@Article{Marcus1995,
  author   = {Gary F Marcus and U Brinkmann and H Clahsen and R Wiese and S Pinker},
  journal  = {Cognit Psychol},
  title    = {German inflection: {T}he exception that proves the rule.},
  year     = {1995},
  number   = {3},
  pages    = {189-256},
  volume   = {29},
  abstract = {Language is often explained as the product of generative rules and
	a memorized lexicon. For example, most English verbs take a regular
	past tense suffix (ask-asked), which is applied to new verbs (faxed,
	wugged), suggesting the mental rule "add -ed to a Verb." Irregular
	verbs (break-broke, go-went) would be listed in memory. Alternatively,
	a pattern associator memory (such as a connectionist network) might
	record all past tense forms and generalize to new ones by similarity;
	irregular and regular patterns would differ only because of their
	different numbers of verbs. We present evidence that mental rules
	are indispensible. A rule concatenates a suffix to a symbol for verbs,
	so it does not require access to memorized verbs or their sound patterns,
	but applies as the "default," whenever memory access fails. We find
	21 such circumstances for regular past tense formation, including
	novel, unusual-sounding, and rootless and headless derived words;
	in every case, people inflect them regularly (explaining quirks like
	flied out, sabre-tooths, walkmans). Contrary to the connectionist
	account, these effects are not due to regular words constituting
	a large majority of vocabulary. The German participle -t applies
	to a much smaller percentage of verbs than its English counterpart,
	and the German plural -s applies to a small minority of nouns. But
	the affixes behave in the language like their English counterparts,
	as defaults. We corroborate this effect in two experiments eliciting
	ratings of participle and plural forms of novel German words. Thus
	default suffixation is not due to numerous regular words reinforcing
	a pattern in associative memory. Because default cases do not occupy
	a cohesive similarity space, but do correspond to the range of a
	symbol, they are evidence for a memory-independent, symbol-concatenating
	mental operation.},
  keywords = {Computing Methodologies, Human, Language, Learning, Mental Processes, Models, Theoretical, Stochastic Processes, Support, U.S. Gov't, Non-P.H.S., Cognition, Linguistics, Neural Networks (Computer), Practice (Psychology), Non-U.S. Gov't, Memory, Psychological, Task Performance and Analysis, Time Factors, Visual Perception, Adult, Attention, Discrimination Learning, Female, Male, Short-Term, Mental Recall, Orientation, Pattern Recognition, Visual, Perceptual Masking, Reading, Concept Formation, Form Perception, Animals, Corpus Striatum, Shrews, P.H.S., Visual Cortex, Visual Pathways, Acoustic Stimulation, Auditory Cortex, Auditory Perception, Cochlea, Ear, Gerbillinae, Glycine, Hearing, Neurons, Space Perception, Strychnine, Adolescent, Decision Making, Reaction Time, Astrocytoma, Brain Mapping, Brain Neoplasms, Cerebral Cortex, Electric Stimulation, Electrophysiology, Epilepsy, Temporal Lobe, Evoked Potentials, Frontal Lobe, Noise, Parietal Lobe, Scalp, Child, Language Development, Psycholinguistics, Brain, Perception, Speech, Vocalization, Animal, Discrimination (Psychology), Hippocampus, Rats, Calcium, Chelating Agents, Excitatory Postsynaptic Potentials, Glutamic Acid, Guanosine Diphosphate, In Vitro, Neuronal Plasticity, Pyramidal Cells, Receptors, AMPA, Metabotropic Glutamate, N-Methyl-D-Aspartate, Somatosensory Cortex, Synapses, Synaptic Transmission, Thionucleotides, Action Potentials, Calcium Channels, L-Type, Electric Conductivity, Entorhinal Cortex, Neurological, Long-Evans, Infant, Mathematics, Statistics, Probability Learning, Problem Solving, Psychophysics, Association Learning, Child Psychology, Habituation (Psychophysiology), Probability Theory, Analysis of Variance, Semantics, Symbolism, Behavior, Eye Movements, Macaca mulatta, Prefrontal Cortex, Cats, Dogs, Haplorhini, Photic Stimulation, Electroencephalography, Nervous System Physiology, Darkness, Grasshoppers, Light, Membrane Potentials, Neural Inhibition, Afferent, Picrotoxin, Vision, Deoxyglucose, Injections, Microspheres, Neural Pathways, Rhodamines, Choice Behavior, Speech Perception, Verbal Learning, Dominance, Cerebral, Fixation, Ocular, Language Tests, Random Allocation, Comparative Study, Saguinus, Sound Spectrography, Species Specificity, Audiometry, Auditory Threshold, Calibration, Data Interpretation, Statistical, Anesthesia, General, Electrodes, Implanted, Pitch Perception, Sound Localization, Paired-Associate Learning, Serial Learning, Auditory, Age Factors, Motion Perception, Brain Injuries, Computer Simulation, Blindness, Psychomotor Performance, Color Perception, Signal Detection (Psychology), Judgment, ROC Curve, Regression Analysis, Music, Probability, Arm, Cerebrovascular Disorders, Hemiplegia, Movement, Muscle, Skeletal, Myoclonus, Robotics, Magnetoencephalography, Phonetics, Software, Speech Production Measurement, Epilepsies, Partial, Laterality, Stereotaxic Techniques, Germany, Speech Acoustics, 8556846},
}

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