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Title The influence of response discriminability and stimulus centring on object-based alignment effects
Publication Date
Date Accessioned
Discipline/Department Department of Psychology
Degree Level masters
University/Publisher University of Victoria
Abstract The present study determined how object-based alignment effects are influenced by the arrangement of the stimuli and response options. It is well established that the magnitude of these effects differ depending on the mode of responding. This finding has often been used to support claims that viewing photograph images of graspable objects can automatically trigger motor representations, regardless of the intentions of the observer. Our findings instead suggest that the distinction between response modes is primarily a difference in response discriminability. More importantly, it was found that this influence of response discriminability works in a completely opposite manner, dependent on the technique used to center the frying pan stimuli. Pixel-centered stimuli produced a handle-based alignment effect that was enhanced under conditions of high response discriminability. Object-centered stimuli produced a body-based alignment effect that was diminished under conditions of high-response discriminability. These findings provide overwhelming evidence that qualitatively different principles govern the alignment effect found with pixel-centered and object-centered stimuli. Crucially, these finding also provide strong evidence against the notion that motor representations are triggered by images of graspable objects in the absence of an intention to act.
Subjects/Keywords Cognition; Sensorimotor Processing; Stimulus-Response Compatibility; Perception and Action
Contributors Bub, Daniel (supervisor)
Language en
Rights Available to the World Wide Web
Country of Publication ca
Record ID oai:dspace.library.uvic.ca:1828/9281
Repository uvic
Date Retrieved
Date Indexed 2020-06-19
Issued Date 2018-04-30 00:00:00
Note [scholarlevel] Graduate;

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…Zacks, 2014; Proctor et al., 2017). As a result, the handle alignment effect has often been attributed to stimulus-response correspondence (SRC) effects that are based on the abstract spatial coding of the stimuli (Phillips & Ward…

…being replaced by one of the stimulus images. The image remained on the screen until a response was made. Subjects completed four blocks of 176 trials. The blocks varied with respect to the response mode (within-hand or between-hands) and…

…orientation mappings. Every participant completed all four of the response-orientation mappings. Each block began with 16 practice trials followed by 160 critical trials, resulting in a total of 704 trials for the complete experiment. All of the stimulus

…images occurred 40 times within each block and were presented in a random order. Breaks were given between practice and critical trials and halfway through critical blocks. 13 1.2 Results Response time was measured from the onset of the stimulus image…

…turn affects key-press responses to the object with the left or right hand. An object evoking a left-handed grasp, for example, will generate motor features that facilitate a speeded response with the same hand, and interfere with a key-press response

…results shown by Tucker & Ellis (1998) have rarely been successful. Alignment effects have been reproducible, but the crucial finding of a modulation of the alignment effect by response mode (betweenversus within-hand responses) has…

…generally been absent (Phillips & Ward, 2002; Cho & Proctor, 2010). Additionally, a number of studies have found negative or reverse alignment effects, in which responses were slower when the handle aligned with the response hand (Yu, Abrams…

…upright-inverted judgements to high-quality photographs of objects instead of silhouette images, the modulation of the alignment effects by response mode could be reproduced (Pappas, 2014). The 3 proposed reason for this distinction was that…