Definition

Noun: A neurological condition characterized by the inability to recognize objects by touch alone, despite having normal sensory function (feeling) in the hands and fingers. It is a disorder of perception where the sense of touch is intact, but the brain cannot interpret or identify what is being felt.

Usage

This is a medical/clinical term used in neurology and neuropsychology. It describes a specific type of perceptual deficit. - It is typically used in diagnostic, academic, or case study contexts. - It is often discussed in relation to other types of agnosia (e.g., visual agnosia, auditory agnosia).

Examples

• The patient's tactile agnosia was evident when he could feel a key in his hand but could not identify it without looking.
• Following the stroke, she developed tactile agnosia, making it difficult for her to find items in her purse by feel.
• The study focused on the neural pathways affected in cases of tactile agnosia.

Advanced Usage

• Astereognosis is often used synonymously with tactile agnosia, though some clinical distinctions may be made, with astereognosis sometimes referring more specifically to the inability to perceive the form and shape of objects.
• The condition is often localized to lesions in the parietal lobe of the brain, particularly the somatosensory association cortex.

Variants and Related Words

• Agnosia (n): The broader category of disorders involving the inability to process sensory information and recognize objects, people, sounds, or smells, despite having intact sensory organs.
• Astereognosis (n): A very closely related term, frequently used interchangeably with tactile agnosia.
• Somatosensory Agnosia (n): Another term that can encompass tactile agnosia.

Synonyms

• Astereognosis (in many clinical contexts)
• Touch blindness (a less technical, descriptive term)

Related Phrases/Idioms

This is a specific medical term; it is not commonly used in idiomatic or phrasal verb constructions.

Noun

1. a loss of the ability to recognize objects by handling them