Presentation Title

Is There Enhanced Visual Processing of Action Relevant Features in Peri-Hand Space?

Format of Presentation

Poster to be presented the Friday of the conference

Presenter Information

Lindsay E. BamfordFollow

Abstract

Peri-hand space, the area surrounding the hand, has been shown to produce an increase in attentional prioritization and slower disengagement of attention compared to objects presented further away (Reed et al., 2006; Abrams et al., 2008). This phenomenon is thought to result from feedback from the reach and grasp networks within the dorsal visual system to occipital visual areas (Perry & Fallah, 2017; Makin et al., 2012). In the proposed research we will examine the effect of graspability (graspable versus non-graspable) and object features (orientation versus saturation) to see if characteristics that are action-relevant and are processed by the dorsal visual stream increase attention and processing in peri-hand space compared to object characteristics that are action-irrelevant and are processed by the ventral visual stream. Participants will be instructed to hold their right hand near or far from a screen in a counterbalanced order and will be asked to identify a target object in a visual array of 11 distractors by touching the target on a screen with their left index finger. The target and distractors will be manipulated by orientation or saturation in a counter balanced order and also be graspable or non-graspable. We will then measure target detection speed and accuracy as well as pre-target fixation durations using eye-tracking software. Our goal is to assess the extent to which the phenomenon of peri-hand space relies on feedback from reach and grasp networks in the dorsal visual stream by assessing whether action-relevant object characteristics increase the perception of stimuli within peri-hand space.

Department

Psychology

Faculty Advisor

Jenni Karl

Comments

I will be submitting two poster presentations so please schedule them for separate times.

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Is There Enhanced Visual Processing of Action Relevant Features in Peri-Hand Space?

Peri-hand space, the area surrounding the hand, has been shown to produce an increase in attentional prioritization and slower disengagement of attention compared to objects presented further away (Reed et al., 2006; Abrams et al., 2008). This phenomenon is thought to result from feedback from the reach and grasp networks within the dorsal visual system to occipital visual areas (Perry & Fallah, 2017; Makin et al., 2012). In the proposed research we will examine the effect of graspability (graspable versus non-graspable) and object features (orientation versus saturation) to see if characteristics that are action-relevant and are processed by the dorsal visual stream increase attention and processing in peri-hand space compared to object characteristics that are action-irrelevant and are processed by the ventral visual stream. Participants will be instructed to hold their right hand near or far from a screen in a counterbalanced order and will be asked to identify a target object in a visual array of 11 distractors by touching the target on a screen with their left index finger. The target and distractors will be manipulated by orientation or saturation in a counter balanced order and also be graspable or non-graspable. We will then measure target detection speed and accuracy as well as pre-target fixation durations using eye-tracking software. Our goal is to assess the extent to which the phenomenon of peri-hand space relies on feedback from reach and grasp networks in the dorsal visual stream by assessing whether action-relevant object characteristics increase the perception of stimuli within peri-hand space.