Double Dissociation in Radial & Rotational Motion-Defined Temporal Order Judgments Poster # 26.456 Leslie Welch1, Nestor Matthews2, Elena Festa1, Kendra.

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Presentation transcript:

Double Dissociation in Radial & Rotational Motion-Defined Temporal Order Judgments Poster # 26.456 Leslie Welch1, Nestor Matthews2, Elena Festa1, Kendra Schafer2 1Brown University - Cognitive, Linguistic & Psychological Sciences; 2Denison University – Psychology Discussion Introduction TOJ Task: Left or Right First? SJ Task: Same or Different Time? Contrary to a shared-mechanism account, Exp 1 revealed distinct temporal order judgment (TOJ) patterns for radial and rotational motion. Reversing the initial directions impaired radial TOJs, but improved rotational TOJs. Contrary to a shared-mechanism account, Exp 2 revealed distinct temporal order judgment (TOJ) vulnerabilities for radial and rotational motion. Phase noise generated larger impairments on rotational TOJs than on radial TOJs. Exp 3 & 4 confirmed and extended Exp 1 & 2’s TOJ results to simultaneity judgments (SJs). Conclusion – The findings suggest a double dissociation between the neural events that limit how precisely we judge asynchronies defined by these two types of MST-mediated motion. Results Exp 2 Exp 4 Exp 3 Exp 1 Motion Physics – The figure above shows that radial motion can be converted to rotational motion (and vice versa) by rotating local linear motion vectors 90 degrees. Motion Physiology – Radial and rotational motion register in the Medial Superior Temporal (MST) region of the primate visual system, according to prior neurophysiological research [1-7]. Research Question References Tanaka & Saito (1989) PMID: 2769351 Duffy & Wurtz (1991a) PMID: 1875243 Duffy & Wurtz (1991b) PMID: 1875244 Smith et al. (2006) PMID: 16420463 Gilmore et al. (2007) PMID: 18093371 Wall et al. (2008) PMID: 18547254 Strong et al. (2017) PMID: 28365777 Do shared or distinct neural events limit how precisely we judge asynchronies defined by these two types of MST-mediated motion? Stimuli & data available on the Open Science Framework: https://osf.io/knvxj/ Poster: http://personal.denison.edu/~matthewsn/vss2018welchmatthewsfestaschafer