[2] Usually, lesions to the left angular gyrus and posterior parietal areas can lead to finger agnosia.
In a study by Rusconi et al., repetitive transcranial magnetic stimulation was used in healthy individuals to simulate finger agnosia.
When their own hand is out of sight and they are asked to name a finger that was touched, they are unable to do so and perform at chance.
[citation needed] Although it is a necessary component of Gerstmann's syndrome, cases of finger agnosia alone have been reported.
Della Sala et al. reported a woman with a stroke in the left subcortical posterior parietal area who had only finger agnosia a year and a half later.