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Published on: February 12, 2020

Semantic category effects modulate visual priming in neglect patients.

Maria P Viggiano¹, Tessa Marzi, Marco Forni

¹Dipartimento di Psicologia, Università di Firenze, Italy. mpviggiano@psico.unifi.it

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior

|July 16, 2011

Summary

Unconscious processing of extinguished stimuli creates implicit priming effects. This study shows semantic content and brain hemispheres influence how visual stimuli are implicitly processed, impacting identification tasks in both healthy individuals and neglect patients.

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Area of Science:

Cognitive Neuroscience
Neuropsychology
Visual Perception

Background:

Extinguished stimuli can be unconsciously processed, causing implicit priming.
The semantic nature of stimuli may modulate these implicit effects.
Understanding hemispheric processing is key to conceptual knowledge organization.

Purpose of the Study:

Investigate if semantic content modulates implicit priming effects from extinguished stimuli.
Examine how visual field presentation (left visual field/LVF, right visual field/RVF) and stimulus category (living/non-living) affect identification.
Compare priming effects in healthy controls and neglect patients.

Main Methods:

Participants (controls and neglect patients) performed a visual identification task.
Stimuli (living and non-living items) were presented in either the LVF or RVF during a study phase.
Identification accuracy was assessed using a sequential image filtering method.

Main Results:

In controls, memory traces acted as primes, reducing identification information needed. Hemispheric differences showed RVF/left hemisphere advantage for artifacts.
Neglect patients exhibited priming for artifacts (both hemispheres) and living items (RVF/left hemisphere only).
Living items presented to the LVF/right hemisphere did not elicit a priming effect in neglect patients.

Conclusions:

Implicit priming effects are modulated by stimulus semantics and hemispheric processing.
A specific implicit mechanism may analyze motor-relevant information for manipulable objects.
Hemispheric specialization influences the processing of conceptual knowledge and visual stimuli.