Visual agnosia is a deficit in shape perception, affecting figure, object, face and letter
recognition. Agnosia is usually attributed to lesions to high-order modules of the visual …

Visual agnosia is defined as an impairment of object recognition, in the absence of visual
acuity or cognitive dysfunction that would explain this impairment. This condition is caused …

The neural mechanisms underlying the access to object knowledge from early
representations of shape are little known. Functional imaging studies support the view that …

Loss of shape recognition in visual-form agnosia occurs without equivalent losses in the use
of vision to guide actions, providing support for the hypothesis of two visual systems (for …

It is argued here that apperceptive object agnosia (generally now known as visual form
agnosia) is in reality not a kind of agnosia, but rather a form of “imperception”(to use the term …

The visual agnosias are an intriguing class of clinical phenomena that have important
implications for current theories of high-level vision. Visual agnosia is defined as impaired …

Patients with visual object agnosia fail to recognize the identity of visually presented objects
despite preserved semantic knowledge. Object agnosia may result from damage to visual …

Publisher Summary This chapter provides an overview of the clinical types of visual agnosia
and related syndromes, the anatomic systems underlying normal and abnormal visual …

We present a comprehensive review of the rare syndrome visual form agnosia (VFA). We
begin by documenting its history, including the origins of the term, and the first case study …

Two patients with visual apperceptive agnosia were examined on tasks assessing the
appreciation of visual material. Elementary visual functioning was relatively preserved, but …