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Visual Agnosia

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...

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Related Experiment Video

Updated: Apr 17, 2026

Portable Intermodal Preferential Looking IPL: Investigating Language Comprehension in Typically Developing Toddlers and Young Children with Autism

Portable Intermodal Preferential Looking IPL: Investigating Language Comprehension in Typically Developing Toddlers and Young Children with Autism

Published on: December 14, 2012

Visual search and the N2pc in children.

Jane W Couperus¹, Colin Quirk

¹Adele Simmons Hall, Cognitive Sciences, Hampshire College, Amherst, MA, 01002, USA, jcouperus@hampshire.edu.

Attention, Perception & Psychophysics

|February 14, 2015

Summary

Children exhibit similar visual selective attention patterns to adults, as evidenced by the N2pc brain activity. This finding indicates children use attentional resources to select targets amidst distractors.

Area of Science:

Cognitive Neuroscience
Developmental Psychology
Visual Attention Research

Background:

Understanding visual selective attention in children is developing, but selection processes with distractors remain unclear.
Adult studies identify the N2pc (an enhanced negativity around 200 ms) during visual search as a marker of target selection.
It was unknown if children exhibit similar N2pc activity during visual search tasks.

Purpose of the Study:

To investigate the presence and characteristics of the N2pc in children during a visual search task.
To compare attentional selection mechanisms between children and adults.

Main Methods:

Nineteen children (9-12 years) and 21 adults (18-22 years) performed a visual search task.
Participants focused on a central fixation point with surrounding target and distractor stimuli.

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Last Updated: Apr 17, 2026

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EEG data was analyzed at parietal electrodes (P7, P8) for three display types: lateral target/lateral distractor, lateral target/midline distractor, and midline target/lateral distractor.

Main Results:

Both adults and children demonstrated a significant N2pc (negativity contralateral to the target) when the target was lateralized.
This N2pc effect was observed in displays with both lateral and midline distractors, but only when the target was lateral.
No significant N2pc effect was found when the target was presented at the midline.

Conclusions:

Children, like adults, show evidence of utilizing attentional resources for selecting target items in the presence of distractors.
The N2pc brain response serves as a reliable marker for attentional object selection in children.
This study bridges the understanding of visual attention mechanisms across different age groups.