Impaired emotion perception and categorization in semantic aphasia

Area of Science:

• Neuroscience
• Cognitive Psychology
• Linguistics

Background:

• Constructionist models emphasize conceptual knowledge in emotion perception.
• Semantic deficits, including access issues in semantic aphasia, can impair emotion recognition.
• The impact of semantic access deficits on emotion perception is less understood than degraded semantic knowledge.

Purpose of the Study:

• To investigate emotion perception and categorization in patients with semantic aphasia.
• To determine if semantic access deficits affect the ability to perceive and categorize emotions.
• To explore how external aids like word anchors and cues influence emotion perception in semantic aphasia.

Main Methods:

• Study 1: Semantic aphasia patients and controls sorted facial emotion portrayals using different category anchors (numbers, labels, pictures).
• Study 2: Participants matched facial emotions to labels, with or without vocal prosody cues (cues, miscues, no cues).
• Control task involved sorting faces by identity to assess non-emotional categorization.

Main Results:

• Semantic aphasia patients made more errors in emotion sorting and benefited more from word anchors.
• Patients struggled to categorize distinct negative emotions but could differentiate positive and negative valence.
• Patients showed poorer overall performance in emotion matching but benefited from cue trials.

Conclusions:

• Deregulated semantic retrieval in semantic aphasia leads to deficits in emotion perception.
• Word anchors and cues can facilitate emotion perception by enhancing access to emotion concepts.
• Controlled semantic retrieval is crucial for interpreting ambiguous emotional cues and distinguishing similar emotional states.