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When working with zoomable information spaces, we can distinguish complex tasks into primary and secondary tasks (e.g., pan and zoom). In this context, a multimodal combination of gaze and foot input is highly promising for supporting manual interactions, for example, using mouse and keyboard. Motivated by this, we present several alternatives for multimodal gaze-supported foot interaction in a computer desktop setup for pan and zoom. While our eye gaze is ideal to indicate a user's current point of interest and where to zoom in, foot interaction is well suited for parallel input controls, for example, to specify the zooming speed. Our investigation focuses on varied foot input devices differing in their degree of freedom (e.g., one-and two-directional foot pedals) that can be seamlessly combined with gaze input.

Purpose The purpose of this paper is to contribute to marketing communications literature by exploring consumer responses to covert advertising (CA) in a social media context. Design/methodology/approach The persuasion knowledge model was used to explore the impact of CA on brand evaluations. A factorial design experiment was conducted in a social media context (YouTube). Findings The results of the study show that triggering knowledge about CA changes the way consumers respond to unfamiliar brands that use such tactics. This implies that for unfamiliar brands, with future development of persuasion knowledge, CA in social media will not only be ineffective but also detrimental with damaging effects on the brand. Research limitations/implications An important contribution of this study lies in the application of the persuasion knowledge model to social media context. Practical implications The results indicate that firms should desist from covert product and brand communications in social media contexts, and instead employ disclosed brand communications. Originality/value Given that the effects of CA have not been investigated in an online context, this study makes a unique contribution to brand communications research by providing valuable insights and better understanding of the effects of CA in social media, specifically YouTube.

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