Predictive Action Perception from Explicit Intention Information in Autism

Matthew Hudson* (Corresponding Author), Toby Nicholson, Anna Kharko, Rebecca McKenzie, Patric Bach

*Corresponding author for this work

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8 Citations (Scopus)
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Social difficulties in Autism Spectrum Disorder (ASD) may originate from a reduced top-down modulation of sensory information that prevents the spontaneous attribution of intentions to observed behaviour. However, although autistic people are able to explicitly reason about others’ mental states, the effect of abstract intention information on perceptual processes has remained untested. ASD participants (n = 23) and a neurotypical (NT) control group (n = 23) observed a hand either reaching for an object or withdrawing from it. Prior to action onset, the participant either instructed the actor to “Take it” or “Leave it”, or heard the actor state “I’ll take it” or “I’ll leave it”, which provided an explicit intention that was equally likely to be congruent or incongruent with the subsequent action. The hand disappeared before completion of the action and participants reported the last seen position of the tip of the index finger by touching the screen. NT participants exhibited a predictive bias in response to action direction (reaches perceived nearer the object, withdrawals perceived farther away), and in response to prior knowledge of the actor’s intentions (nearer the object after “Take it”, farther away after “Leave it”). However, ASD participants exhibited a predictive perceptual bias only in response to the explicit intentions, but not in response to the motion of the action itself. Perception in ASD is not immune from top-down modulation. However, the information must be explicitly presented independently from the stimulus itself, and not inferred from cues inherent in the stimulus.
Original languageEnglish
Pages (from-to)1556-1566
Number of pages11
JournalPsychonomic Bulletin and Review
Issue number5
Early online date23 May 2021
Publication statusPublished - Oct 2021

Bibliographical note

Thanks to Charlotte Brind and Kiara Konstantinidou for WASI data collection, and to Barbara Wilson for participant liaison, recruitment, and organisation.
This work was supported by the Economic and Social Research Council (grant no.647 ES/J019178/1) awarded to P.B.


  • Autism Spectrum Disorder
  • Action Prediction
  • Predictive Coding
  • implicit/explicit metalizing
  • representational momentum


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