Tmc^Gal4/Tmc¹ and Tmc¹ homozygous, but not heterozygous, mutant adult females have a significant increase in preference for softer 100 mM sucrose-containing, but not plain, agarose for egg laying, compared to controls; Tmc¹/Tmc^f01875 adult females also have a significant increase in preference for softer 100 mM sucrose-containing agarose for egg laying, compared to controls; Tmc^Gal4/Tmc¹ and Tmc¹ homozygous adult females have no difference in preference for 100 mM sucrose-containing (rather than plain) agarose for egg laying, compared to controls; Tmc¹ homozygous adult females have no difference in agarose softness preference for feeding on 100 mM sucrose, compared to controls.

Tmc¹ mutant adults have no difference in spiking of mechanosensory neurons of the labellar taste bristles or labellar taste pegs in response to mechanical stimuli, compared to controls.

Tmc^f01875 mutant adults show defective food texture perception: compared to wild-type they show significantly weaker preference for less solid sucrose-agarose food than a harder one (increasing agarose conc., same sucrose content) in two-way food choice assays and unlike controls display comparable response levels to solid and liquid foods regardless of their stiffness or viscosity in a proboscis extension reflex assay. However, the mutant flies show normal avoidance of bitter tastants.

The firing of multidendritic neurons in the labellum in response to bending of the L-type taste bristles is not observed in Tmc¹ mutant adults, regardless of the direction of the deflection.