A DCM study of spectral asymmetries in feedforward and feedback connections between visual areas V1 and V4 in the monkey

• DOI: 10.1016/j.neuroimage.2014.12.081
• Publication Date: 2015-01-10T01:47:26Z
• Authors: A.M. Bastos; V. Litvak; R. Moran; C.A. Bosman; P. Fries; K.J. Friston
• Keywords: Feed forward

This paper reports a dynamic causal modeling study of electrocorticographic (ECoG) data that addresses functional asymmetries between forward and backward connections in the visual cortical hierarchy. Specifically, we ask whether employ gamma-band frequencies, while preferentially use lower (beta-band) frequencies. We addressed this question by empirical cross spectra using neural mass model equipped with superficial deep pyramidal cell populations-that source connections, respectively. enabled us to reconstruct transfer functions associated specific subpopulations within sources. first established Bayesian comparison was able discriminate defined terms their cells origin. then confirmed selection identify extrastriate (V4) sources as being hierarchically higher than early (V1) Finally, an examination auto employed predominantly (gamma) were mediated (alpha/beta) discuss these findings relation current views about alpha, beta, gamma oscillations predictive coding brain.