Agnosic alexia represents one of the most intriguing disconnection syndromes in cognitive neuropsychology, illustrating a profound dissociation between the visual perception of written text and preserved language production. Individuals afflicted with this condition maintain the capacity to write fluently and comprehend spoken language, yet remain entirely incapable of reading their own handwritten sentences moments after penning them. This classic neurological phenomenon provides essential insight into the architecture of the human visual word form system and the functional pathways connecting visual cortex processing to dominant linguistic networks.
Agnosic Alexia
1. Concise Definition
Agnosic alexia, historically recognized as pure alexia, alexia without agraphia, or pure word blindness, is a selective acquired reading impairment characterized by an inability to read visually presented words despite preserved auditory language comprehension, preserved speech production, and remarkably intact spontaneous writing skills. Patients afflicted with this condition cannot visually recognize orthographic forms as lexical units, yet their general visual acuity, intelligence, and higher-order linguistic abilities remain largely unimpaired.
Functionally, the disorder is classified as an associative or apperceptive visual deficit restricted specifically to written symbols. Although patients can identify individual letters through arduous, serial letter-by-letter spelling strategies, they lack the immediate, holistic word recognition characteristic of intact adult reading. Crucially, because writing networks within the dominant parietal and motor cortices remain intact, the individual can formulate and transcribe complex thoughts onto paper, yet immediately thereafter experiences an inability to read back what has been transcribed.
Neurobiologically, agnosic alexia is classically produced by a disconnection between intact right-hemisphere visual cortices and the language-dominant left-hemisphere reading networks. This anatomical isolation typically arises from an infarction involving the left posterior cerebral artery, damaging the left occipital lobe and the splenium of the corpus callosum. Consequently, visual linguistic inputs fail to reach the visual word form area located in the left ventral occipitotemporal cortex.
2. Etymology & Linguistic Origin
The term agnosic alexia derives from Classical Greek linguistic roots reflecting sensory-cognitive dissociation. The prefix agnosic stems from agnōsia (ἀγνωσία), formed by the privative prefix a- (ἀ-, “without” or “lack of”) and gnōsis (γνῶσις, “knowledge” or “recognition”). In classical neuropsychology introduced by Sigmund Freud in 1891, agnosia was coined to designate the loss of the ability to recognize sensory stimuli despite preserved basic sensory reception.
The constituent alexia combines the privative a- (ἀ-) with the Greek noun lexis (λέξις, “diction,” “word,” or “speech”), which in turn is derived from the verb legein (λέγειν, “to speak” or “to read”). While historically connected to speech, twentieth-century clinical terminology established alexia as the technical medical designation for an acquired loss or impairment of the ability to read written language, contrasting with dyslexia, which often denotes developmental reading difficulties.
The clinical term gained prominence in early French, German, and Anglo-American aphasiology. It was formulated to distinguish pure visual recognition failure of orthography from linguistic or phonological reading disorders. The synthesis agnosic alexia specifically emphasizes that the reading failure is not a central linguistic defect, but rather an agnosia limited to orthographic perceptual constructs.
3. Pronunciation & Grammatical Form
Pronunciation: /æɡˈnɒs.ɪk əˈlɛk.si.ə/ (British English) or /æɡˈnɑː.sɪk əˈlɛk.si.ə/ (American English). The secondary phonetic stress falls upon the second syllable of agnosic, while the primary stress in alexia falls upon the second syllable, accented as -lex-.
Grammatical Form: Compound noun phrase. The head noun is the abstract, non-count clinical condition alexia, modified by the descriptive relational adjective agnosic.
Syntactic Usage and Inflection:
- Noun phrase (Condition): “The neurological evaluation confirmed a diagnosis of agnosic alexia secondary to posterior cerebral artery ischemia.”
- Adjectival use: “The patient exhibited an agnosic alexic profile during standard neuropsychological subtests.”
- Alternative clinical synonyms: Frequently utilized interchangeably in modern neurological literature with pure alexia, alexia without agraphia, occipital alexia, and word-blindness (cecitas verbalis).
4. Detailed Conceptual Explanation
To grasp the conceptual architecture of agnosic alexia, one must contrast the parallel processing of normal fluent reading with the disrupted pathways seen in neurological disconnection. Normal reading in literate adults involves near-instantaneous orthographic parsing. When an individual fixates on a word, early visual processing in the striate and extrastriate cortices captures features such as strokes, lines, and junctions. Within approximately 150 to 200 milliseconds, these distributed sensory features are assembled into abstract orthographic representations in the ventral occipitotemporal cortex—specifically the visual word form area. From this structural hub, activation cascades synchronously into anterior semantic, phonological, and syntactic language modules within the left temporal, parietal, and frontal lobes.
In agnosic alexia, this rapid, parallel recognition pipeline is severed. The patient possesses intact visual cortex processing in at least one hemisphere (typically the right) and functional linguistic modules in the left hemisphere (including Broca’s area, Wernicke’s area, and the angular gyrus). However, information cannot bridge the visual receiving areas and the left-hemisphere language machinery. As a result, the written stimulus is perceived as an abstract graphic design, geometric drawing, or uninterpretable script. The patient can see that marks exist on paper, can describe lines, angles, and contrast, but cannot interpret the visual form as a meaningful word.
A defining hallmark of agnosic alexia is the reliance on a compensatory letter-by-letter (LBL) reading strategy. Deprived of parallel visual word recognition, patients inspect each letter sequentially, sounding it out aloud or through sub-vocal articulation, gradually synthesizing the phonological identity of the word. For instance, encountering the word “train,” the individual may say: “T… R… A… I… N… that is ‘train’.” Consequently, reading latency increases monotonically and linearly as word length expands. While a normal adult reads three-letter and eight-letter words in nearly identical spans of time (between 200 and 250 milliseconds), a patient with agnosic alexia may read a three-letter word in 2 seconds and an eight-letter word in 10 to 15 seconds.
Remarkably, agnosic alexia preserves tactile, kinesthetic, and auditory routes to the lexicon. If the examiner spells the letters of a word aloud (“t-r-a-i-n”), the patient immediately identifies the word without hesitation. Furthermore, if letters are traced onto the patient’s palm, or if the patient traces physical letters using motor movements, kinesthetic feedback activates lexical nodes within the parietal lobes, enabling rapid recognition. This dramatic dissociation proves unequivocally that the lexical representations themselves are not degraded; rather, the visual perceptual gateway alone has been disconnected from the linguistic system.
5. Historical Development
The foundational clinical observation of pure reading impairment dates to the late nineteenth century, a golden era of behavioral neurology and anatomical localization. The syndrome was formally recognized and anatomically documented by the French neurologist Jules Déjerine in his landmark 1892 publication. Déjerine described a 68-year-old retired textile merchant, Monsieur C., who experienced a sudden loss of the ability to read while remaining entirely capable of speaking, understanding conversation, and writing complex documents.
Monsieur C. woke one morning and found himself unable to read the morning paper, musical scores, or his own private correspondence. When examined by Déjerine, Monsieur C. could write fluently from dictation and spontaneously formulate elegant business letters, but if handed the page seconds later, he examined it with bewilderment and could not read a single sentence. Four years later, Monsieur C. suffered a second stroke that damaged his left angular gyrus, which subsequently stripped away his ability to write, producing combined alexia with agraphia.
Postmortem examination of Monsieur C.’s brain validated Déjerine’s disconnection model. The initial lesion had destroyed the left primary visual cortex (calcarine cortex) and extended into the splenium of the corpus callosum. Déjerine deduced the neuroanatomical mechanism: because the left visual cortex was infarcted, visual information from the right visual field could not be processed, producing a right homonymous hemianopia. Visual information from the left visual hemifield was successfully received by the intact right visual cortex, but because the splenium of the corpus callosum was severed, visual signals could not cross interhemispherically to the left hemisphere’s language centers. This postmortem deduction established one of the very first proven disconnection syndromes in clinical medicine.
Throughout the mid-twentieth century, the concept of disconnection syndromes was revitalized by the American neurologist Norman Geschwind. In his seminal 1965 papers on disconnection syndromes in animals and humans, Geschwind repositioned Déjerine’s work within modern sensory-motor network theory. Geschwind demonstrated that higher-order cognitive dysfunctions could emerge purely from disrupted white matter fascicles connecting modular cortical processing zones, without destruction of the primary computational processors themselves. Subsequent advancements in structural magnetic resonance imaging (MRI) and functional neuroimaging in the late twentieth and early twenty-first centuries further refined this model, identifying focal damage to the visual word form area itself as another direct etiology of agnosic alexia.
6. Theoretical Foundations
The conceptualization of agnosic alexia relies on three primary theoretical frameworks: neurological disconnection theory, the cognitive neuropsychological dual-route cascaded model of reading, and contemporary ventral visual stream neuroimaging theories.
Under disconnection theory, complex behavioral faculties rely on distributed networks of cortical zones integrated by white matter tracts. Agnosic alexia serves as the classic paradigm of sensory-linguistic disconnection. Sensory analysis operates normally within unimpaired visual cortices, while phonological, morphological, and syntactic processing persists in intact language structures. Disconnection of association tracts—specifically the splenium of the corpus callosum and the forceps major—deprives the language network of essential visual percepts, isolating word forms from semantic meaning.
Within the dual-route cascaded model of reading formulated by Max Coltheart and colleagues, oral reading can proceed along two distinct functional pathways:
- The Lexical-Semantic Route: The visual word form directly activates an entry in the orthographic input lexicon, which then accesses the semantic system and the phonological output lexicon. This route enables instantaneous parallel recognition of familiar words and is indispensable for reading irregularly spelled words (e.g., “yacht,” “colonel”).
- The Non-Lexical (Grapheme-to-Phoneme Conversion) Route: Written words are parsed sequentially into component graphemes, which are converted into phonemes via sub-lexical rules. This route allows the decoding of unfamiliar regular words and pseudowords (e.g., “slint”).
In agnosic alexia, the primary visual input path leading directly into the orthographic input lexicon is severely compromised. The patient cannot utilize the rapid lexical-semantic route. Instead, they are forced to engage a slow, conscious, externalized feedback loop: visual identification of single graphemes, auditory or kinesthetic feedback from letter naming, entry into auditory working memory, and subsequent re-assembly through the phonological route. This mechanistic reality explains why irregular words read via this letter-by-letter strategy may occasionally be regularized or mispronounced if letter identification fails.
Finally, modern ventral visual stream models, articulated notably by Stanislas Dehaene and Laurent Cohen, highlight the specialized hierarchical tuning of the ventral occipitotemporal cortex (vOT). This framework, known as the Neuronal Recycling Hypothesis, proposes that reading capitalizes on evolutionarily ancient visual circuitry dedicated to shape and object recognition. In literate individuals, a specific zone in the left lateral fusiform gyrus is tuned to orthographic patterns: the visual word form area. When this node or its afferent white matter connections (such as the vertical occipital fasciculus or inferior longitudinal fasciculus) are structurally compromised, the brain loses its tuned visual parser, precipitating agnosic alexia.
7. Key Components, Types & Dimensions
The clinical spectrum of agnosic alexia is not entirely uniform. Variations occur depending on lesion volume, white matter involvement, and functional reorganization. The condition can be broken down along multiple clinical and cognitive dimensions:
- Classic Déjerine Disconnection Type: Involves infarction of the left medial occipital lobe (producing a dense right homonymous hemianopia) combined with ischemic infarction of the splenium of the corpus callosum. In this type, the left hemisphere language network is entirely intact, but right occipital visual signals cannot cross into the left hemisphere.
- Focal Cortical Visual Word Form Area (vOT) Type: Caused by a direct cortical or subcortical lesion localized precisely beneath or within the visual word form area of the left lateral fusiform gyrus. In this presentation, patients may demonstrate no visual field defects (no hemianopia), yet exhibit profound agnosic alexia because the visual dictionary node itself is destroyed.
- Compensated Letter-by-Letter (LBL) Reading: A clinical manifestation characterized by preserved identification of individual isolated characters. Patients exhibit a profound “word-length effect,” where each additional letter in a word adds hundreds to thousands of milliseconds to total reading duration.
- Global (Total) Alexia / Letter Blindness: A severe variant in which the patient loses not only the ability to read whole words, but also the ability to recognize individual letters (literal alexia). These patients cannot even employ letter-by-letter strategies and can misidentify basic letters as geometric configurations.
- Implicit / Covert Reading Subtype: A phenomenon observed in select pure alexic patients who verbally insist they cannot read a presented word, yet perform significantly above chance on forced-choice semantic classification tasks (e.g., categorizing an unseen word as “animal” versus “vehicle”), pointing toward residual subliminal orthographic processing occurring in undamaged right hemisphere circuits.
8. Examples & Illustrative Cases
To understand the lived reality and clinical presentation of agnosic alexia, consider two illustrative clinical profiles derived from standard neuropsychological presentations.
Case Study 1: Classic Posterior Disconnection
A 62-year-old retired accountant experienced a sudden onset of visual disturbances and was admitted through the emergency department. Brain MRI revealed an acute ischemic stroke within the distribution of the left posterior cerebral artery, damaging the left medial occipital cortex and the splenium of the corpus callosum. Neurological examination revealed a complete right homonymous hemianopia. Motor, sensory, and spontaneous conversational speech examinations were unremarkable.
When presented with a clipboard and pen, the patient composed a coherent, grammatically impeccable paragraph describing the symptoms that brought him to the hospital. However, when the clipboard was turned around thirty seconds later and he was asked to read his own handwriting, he was completely unable to do so. He stated: “I can see the black ink lines and curves clearly, but they look like foreign calligraphy. I know I just wrote this, but I have no idea what it says.” When the examiner spelled the word “h-o-s-p-i-t-a-l” aloud, the patient recognized it instantly without hesitation.
Case Study 2: Letter-by-Letter Visual Word Form Area Lesion
A 45-year-old high school literature teacher sustained a focal contusion of the left lateral occipitotemporal cortex following a traumatic motor vehicle accident. Visual perimetry demonstrated full, intact visual fields without hemianopia or neglect. However, the patient reported that words on a printed page “shattered into independent, uncooperative pieces.”
During formal reading assessments, the patient read three-letter words (“cat,” “pen”) with an average latency of 2.8 seconds. When tested with six-letter words (“winter,” “castle”), latency escalated to 7.4 seconds. By ten-letter words (“photograph”), reading time reached 18.2 seconds. Her reading behavior was characterized by visible vocal and sub-vocal articulation: she named each letter aloud sequentially, whispered the collective phonemes to herself, and then stated the full word. In contrast, her spontaneous writing, spelling ability, and oral discourse remained preserved at an advanced collegiate level.
9. Measurement & Assessment
Comprehensive evaluation of agnosic alexia necessitates an exhaustive neuropsychological and neuroimaging battery to distinguish the disorder from central linguistic aphasia, visual spatial neglect, and apperceptive visual object agnosia.
The standard clinical assessment protocol encompasses several specialized diagnostic steps:
- Visual Fields and Perimetry: Humphrey visual field testing or Goldman perimetry is essential to delineate the presence of a right homonymous hemianopia or upper right quadrantanopia, which frequently accompanies occipital-splenial lesions.
- Reading Latency and the Word-Length Effect: Computerized lexical decision and word-reading tasks measuring precise reaction times (in milliseconds) as a function of word length (from 2 to 10 letters). A linear increase in reading reaction time exceeding 100 milliseconds per letter serves as the quantitative diagnostic hallmark of pure letter-by-letter alexia.
- Lexical Variables Analysis: Systematic contrast of reading accuracy across varying linguistic dimensions, including word frequency (high vs. low frequency), imageability (abstract vs. concrete), and orthographic regularity (regular words vs. exception/irregular words like “choir”). In agnosic alexia, word length dominates performance, while frequency and imageability exert minor influence compared to what is observed in deep or surface alexias.
- Cross-Modal Linguistic Testing: Comparative evaluation of:
- Spontaneous writing, writing to dictation, and delayed self-reading.
- Oral spelling and auditory spelling comprehension (recognizing a word spelled aloud by the examiner).
- Tactile reading (tracing block letters in the patient’s palm).
- Visual Object and Face Recognition: Administration of the Boston Naming Test and facial recognition batteries (e.g., Benton Facial Recognition Test or Cambridge Face Memory Test) to ascertain whether the visual processing deficit is isolated strictly to orthography or accompanied by visual object agnosia or prosopagnosia.
- Structural and Functional Neuroimaging: High-resolution 3D T1-weighted and diffusion tensor imaging (DTI) MRI to evaluate structural integrity of the left occipital lobe, the splenium, and deep association bundles such as the inferior longitudinal fasciculus.
10. Applications & Practical Significance
The clinical and functional implications of agnosic alexia are profound. In modern society, reading represents an indispensable conduit for daily living, communication, economic independence, and safety. A patient who suddenly develops pure alexia loses the ability to read street signs, prescription drug labels, grocery tags, text messages, and computer screens, inducing catastrophic disruption to daily life even while expressive communication remains preserved.
In clinical neurorehabilitation, diagnosing agnosic alexia early guides targeted behavioral therapies rather than generic language interventions. Because traditional aphasia therapies focus on restoring core linguistic representations, they fail to resolve an orthographic perceptual disconnection. Neurorehabilitation for agnosic alexia focuses on specific compensatory interventions:
- Tactile-Kinesthetic Rehabilitation: Patients are trained to trace letters using their dominant hand, index finger, or tactile styluses while attempting to read. The somatosensory and motor kinesthetic feedback enters parietal processing areas, bypassing the damaged occipitotemporal visual pathways to activate phonological schemas.
- Multiple Oral Rereading (MOR): A specialized cognitive behavioral training technique where patients read the same passage of text aloud repeatedly over several days or weeks until reading latency decreases through context-driven semantic top-down facilitation.
- Assistive Reading Technologies: Integration of modern optical character recognition (OCR) systems, text-to-speech software, and artificial intelligence visual assistants on smartphones and smart glasses, transforming printed text instantly into auditory input to preserve patient autonomy.
11. Research & Empirical Evidence
Decades of neuroimaging and experimental behavioral research have made agnosic alexia a primary foundation for contemporary models of reading neuroscience. Laurent Cohen and Stanislas Dehaene (2000, 2004) published seminal functional MRI studies demonstrating that in healthy readers, the visual word form area within the left lateral fusiform gyrus activates invariantly to written letters regardless of case (upper versus lower case), font, or visual field of presentation. In patients with agnosic alexia secondary to focal ventral occipitotemporal damage, this metabolic activation peak is extinguished or structurally absent.
Electrophysiological studies using magnetoencephalography (MEG) and scalp event-related potentials (ERPs) have identified that the standard N170 wave—an electrical deflection occurring 170 milliseconds post-stimulus onset reflecting structural orthographic encoding—is absent or severely distorted over the left posterior scalp in patients with pure alexia. Instead, these individuals show atypical, bilateral, or right-lateralized delayed posterior activity (>300–400 ms), tracking sequential scanning of each individual character.
Diffusion tensor imaging (DTI) tractography studies by researchers such as Catani and Mesulam have mapped the precise microstructural disconnections underlying pure alexia. These studies show that disruption of the splenium and ventral association bundles systematically decouples the retinotopic visual maps in the lingual and fusiform gyri from the language-processing hubs in the superior temporal and inferior parietal zones, validating Déjerine’s initial anatomical hypothesis.
12. Cultural & Cross-Cultural Considerations
The manifest expression of agnosic alexia is heavily modulated by the structural and linguistic characteristics of different writing systems across cultures. Writing systems across the world vary substantially in their visual complexity and the transparency of their orthography-to-phonology mapping.
In alphabetic languages with deep orthographies (such as English, French, and Danish), the sound-letter correspondence is irregular and complex. Compensatory letter-by-letter reading often results in pronunciation errors when irregular words are encountered, because the patient regularizes them using default letter-sound rules. Conversely, in alphabetic languages with shallow orthographies (such as Italian, Spanish, or Finnish), patients can read almost any word correctly via letter-by-letter decoding once individual letters are identified, though the process remains extremely slow.
Cross-cultural manifestations become particularly fascinating in non-alphabetic scripts, such as Japanese and Chinese. Japanese orthography utilizes two distinct writing systems concurrently: Kana (syllabic scripts representing sound components) and Kanji (morphographic, logographic characters representing lexical meaning and visual concepts). Neuropsychological studies of Japanese patients with posterior cerebral artery infarctions have reported striking dissociations:
- Some patients present with profound alexia for Kana while retaining the ability to read Kanji characters, as complex ideographic characters can sometimes be decoded through holistic right-hemisphere visual pathways.
- Conversely, other patients lose the ability to decode complex Kanji while preserving slow, mechanical decoding of Kana, reflecting differences in structural visual load and lexical versus phonological reliance.
13. Criticisms, Debates & Limitations
Despite its classic textbook status, the precise theoretical characterization of agnosic alexia remains an arena of ongoing debate within cognitive neuroscience. Three major controversies characterize the literature:
1. Pure Disconnection vs. General Visual Deficit: Classic neurology conceptualizes pure alexia as an isolated linguistic-visual disconnection. However, visual psychophysicists, such as Matthew Lambon Ralph and colleagues, have challenged this notion. They argue that many patients diagnosed with pure alexia demonstrate subtle visual processing deficits for other non-linguistic, visually complex stimuli, including line drawings, checkerboards, or complex geometric shapes, when tested with sensitive psychophysical paradigms. This raises the question of whether the disorder is truly domain-specific to words or represents a general deficit in processing fine, high-spatial-frequency visual patterns.
2. Nature of the Visual Word Form Area: Controversy exists regarding whether the left fusiform region is truly an innate, specialized “visual word form area” (the domain-specific view championed by Dehaene and Cohen) or a general-purpose visual recognition cortex optimized for resolving fine-grained foveal visual distinctions that has been co-opted by literacy (the domain-general expertise view championed by Price and Devlin).
3. Mechanisms of Covert Reading: The phenomenon of implicit or “covert” reading—where patients read words above chance without conscious awareness—sparks fierce debate. Some researchers suggest covert reading is driven by weak, degraded signal transmission via residual callosal fibers to the dominant language hemisphere, while others maintain that the right hemisphere possesses intrinsic, rudimentary semantic processing capabilities capable of basic lexical categorization without conscious phonological access.
14. Related Terms & Distinctions
Agnosic alexia must be differentiated from other acquired reading, writing, and visual disorders:
- Alexia with Agraphia (Central Alexia): Unlike agnosic alexia, patients with alexia with agraphia lose both the capacity to read and the capacity to write. This condition typically results from damage to the left angular gyrus or temporoparietal junction, which houses central multimodal orthographic representations.
- Aphasic Alexia: Reading deficits that occur within the broader context of an aphasic syndrome (such as Broca’s or Wernicke’s aphasia). In these individuals, reading difficulties directly reflect underlying global linguistic impairments involving syntax, semantics, or phonology, accompanied by spoken language dysfunction.
- Apperceptive Visual Agnosia: A global inability to recognize, copy, or perceive visual stimuli, including objects, shapes, and faces, due to diffuse visual cortex injury (e.g., carbon monoxide poisoning). Agnosic alexia is far more selective, sparing general object perception while impairing reading.
- Visual Spatial Neglect Alexia: A reading disorder secondary to hemispatial neglect (typically following right hemisphere parietal strokes), in which patients fail to attend to the left side of words or pages (e.g., reading “newspaper” as “paper”), without letter-by-letter compensatory behaviors.
- Prosopagnosia: The selective inability to recognize familiar human faces, which frequently co-occurs with pure alexia if a posterior lesion extends bilaterally or into the right fusiform face area, but represents a clinically and functionally distinct domain-specific agnosia.
15. Summary / Key Takeaways
Agnosic alexia stands as one of the most remarkable dissociations in cognitive neuroscience, demonstrating that the human capacity to comprehend and formulate written language is structurally independent of the visual gateways that decode print. Patients retain the ability to write thoughts eloquently, express spoken language fluently, and comprehend auditory discourse, yet remain entirely incapable of reading back what they have written.
Rooted in Jules Déjerine’s foundational nineteenth-century discoveries and expanded by modern neuroimaging, the condition illustrates how an anatomical disconnection—typically disrupting the left visual cortex and the splenium of the corpus callosum—can isolate unimpaired language cortices from visual input. While contemporary management relies on compensatory strategies like letter-by-letter reading and assistive text-to-speech technology, the study of agnosic alexia continues to advance our broader understanding of the visual word form system, interhemispheric communication, and the neural substrates of human literacy.
References
- Coltheart, M., Rastle, K., Perry, C., Langdon, R., & Ziegler, J. (2001). DRC: A dual route cascaded model of visual word recognition and reading aloud. Psychological Review, 108(1), 204–256. https://doi.org/10.1037/0033-295X.108.1.204
- Dehaene, S., & Cohen, L. (2011). The unique role of the visual word form area in reading. Trends in Cognitive Sciences, 15(6), 254–262. https://doi.org/10.1016/j.tics.2011.04.003
- Déjerine, J. (1892). Contribution à l’étude anatomo-pathologique et clinique des différentes variétés de cécité verbale. Mémoires de la Société de Biologie, 4, 61–90.
- Geschwind, N. (1965). Disconnexion syndromes in animals and man. Brain, 88(2), 237–294. https://doi.org/10.1093/brain/88.2.237
- Price, C. J., & Devlin, J. T. (2011). The interactive account of ventral occipitotemporal contributions to reading. Trends in Cognitive Sciences, 15(6), 246–253. https://doi.org/10.1016/j.tics.2011.04.001