When retrieving image from memory, humans usually move their eyes spontaneously as if the image were in front of them. Such eye movements correlate strongly with the spatial layout of the recalled image content and function as memory cues facilitating the retrieval procedure. However, how close the correlation is between imagery eye movements and the eye movements while looking at the original image is unclear so far. In this work we first quantify the similarity of eye movements between recalling an image and encoding the same image, followed by the investigation on whether comparing such pairs of eye movements can be used for computational image retrieval. our results show that computational image retrieval based on eye movements during spontaneous imagery is feasible. furthermore, we show that such a retrieval approach can be generalized to unseen images. Research on eye movements during visual imagery has a long history. Early investigations 1-3 from the beginning of the twentieth century have established a link between eye movements during visual imagery and mental images, based on observations of eye movements during imagery. Neisser 4 argued that eye movements are actively associated with the construction of a visual image, and Hebb 5 suggested that eye movements during imagery and memory retrieval are necessary to assemble and organize "part images" into a whole visualized image. Many recent studies 6-14 have shown that humans spontaneously move their eyes when recalling a scene from memory and that such eye movement patterns closely resemble the spatial arrangement of the elements of the recalled content. This effect has not only been demonstrated for participants who encode visual scenes and later recall those scenes while looking at an empty screen 6,7,9,11,14,15 , but also for participants who encode verbal information in association with a spatial cue and later recall such information while looking at an empty screen 12,13. Moreover, it has been shown that participants who listen to scene descriptions also make eye movements which correspond to spatial positions from the described scene 7,14,15. Previous studies evaluated the functionality of eye movements to blank space. Results suggest that eye movements while looking at nothing play a functional role during memory retrieval, and act as "spatial indices" 4,5,11,12,16 that may provide assistance in memorizing the spacial layout of a scene 4-6,11. However, it has been argued whether such eye movements can facilitate memory retrieval as additional cues 17,18. In support of such a functional role, impaired episodic memory performance has been reported in experiments where participants were restricted to look at a fixation cross during recall 9-11,15. In Johansson et al. 9 , participants' gaze directions were manipulated towards positions on an empty screen that are either overlapped with the original locations of the to-be-retrieved visuospatial information or selected randomly at irrelevant locations. Results demonstrated that the likelihood of succes...