Cite as:
Likova L T, Tyler C W, 2004, "Lateral cortical specialisation for cyclopean motion-in-depth" Perception 33 ECVP Abstract Supplement

Lateral cortical specialisation for cyclopean motion-in-depth

L T Likova, C W Tyler

We studied the fMRI activation to cyclopean motion-in-depth entirely based on disparity modulation (CMID). We eliminated the interocular velocity difference cue that accompanies classical stereoscopic motion-in-depth by using dynamic random-dot autostereograms (DRDSs) based on continuous monocular dynamic noise containing no coherent motion information. Block fMRI design was used. Both the test and the null were based on full-field DRDSs, refreshed every 60 ms. In experiment 1, apparent CMID (the stereomotion test) was contrasted with a zero-disparity plane (static null). In experiment 2, to balance for disparity, the same CMID test was contrasted with null period incorporating the CMID disparities as static planes. Retinotopic areas and hMT+ were mapped in separate scans. fMRI responses were obtained on a GE Signa 3T scanner with spiral acquisition in 23 coronal slices, 3 mm thick, at 3 s TR. Test and null stimuli alternated for 9 s each in 36 blocks per scan. The CMID activation in both experiments was substantially shifted anterior to the hMT+, with minimal activation inside hMT+. No significant difference was found between activation with disparity-balanced or non-balanced nulls, implying that these CMID areas are not concerned with disparity per se.

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